LM2462 Monolithic Triple 3 ns CRT Driver
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1 LM2462 Monolithic Triple 3 ns CRT Driver General Description The LM2462 is an integrated high voltage CRT driver circuit designed for use in color monitor applications. The IC contains three high input impedance, wide band amplifiers which directly drive the RGB cathodes of a CRT. Each channel has its gain internally set to 20 and can drive CRT capacitive loads as well as resistive loads present in other applications, limited only by the package s power dissipation. The IC is packaged in an industry standard 11-lead TO-220 molded plastic power package. See Thermal Considerations section. Schematic and Connection Diagrams Features n Higher gain to match LM126X CMOS preamplifiers n 0V to 3.75V input range n Stable with 0 20 pf capacitive loads and inductive peaking networks n Convenient TO-220 staggered lead package style n Maintains standard LM240X Family pinout which is designed for easy PCB layout Applications n 1600 x 1200 displays up to 85Hz refresh n Pixel clock frequencies up to 230 MHz n Monitors using video blanking February 2002 LM2462 Monolithic Triple 3 ns CRT Driver FIGURE 1. Simplified Schematic Diagram (One Channel) DS Note: TabisatGND DS Top View Order Number LM2462TA NS Package Number: TA11B 2002 National Semiconductor Corporation DS
2 LM2462 Absolute Maximum Ratings (Notes 1, 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Lead Temperature (Soldering, <10 sec.) ESD Tolerance, Human Body Model Machine Model 300 C 2kV 250V Supply Voltage (V CC ) +90V Bias Voltage (V BB ) +16V Input Voltage (V IN ) 0V to 4.5V Storage Temperature Range (T STG ) 65 C to +150 C Operating Ranges (Note 2) V CC +60V to +85V V BB +8V to +15V V IN +0V to +3.75V V OUT +15V to +75V Case Temperature 20 C to +100 C Do not operate the part without a heat sink. Electrical Characteristics (See Figure 2 for Test Circuit) Unless otherwise noted: V CC = +80V, V BB = +12V, C L = 8 pf, T C = 50 C DC Tests: V IN = 2.25VDC AC Tests: Output = 40V PP (25V - 65V) at 1MHz Symbol Parameter Conditions LM2462 Min Typical Max Units I CC Supply Current All Three Channels, No Input Signal, No Output Load 63 ma I BB Bias Current All Three Channels 42 ma V OUT DC Output Voltage No AC Input Signal, V IN = 1.25V V DC A V DC Voltage Gain No AC Input Signal A V Gain Matching (Note 4), No AC Input Signal 1.0 db LE Linearity Error (Notes 4, 5), No AC Input Signal 8 % t R Rise Time (Note 6), 10% to 90% ns t F Fall Time (Note 6), 90% to 10% ns OS Overshoot (Note 6) 8 % Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 2: Operating ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may change when the device is not operated under the listed test conditions. Note 3: All voltages are measured with respect to GND, unless otherwise specified. Note 4: Calculated value from Voltage Gain test on each channel. Note 5: Linearity Error is the variation in dc gain from V IN = 1.0V to V IN = 3.5V. Note 6: Input from signal generator: t r,t f <1 ns. Note 7: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. 2
3 AC Test Circuit LM2462 Note: 8 pf load includes parasitic capacitance. FIGURE 2. Test Circuit (One Channel) DS Figure 2 shows a typical test circuit for evaluation of the LM2462. This circuit is designed to allow testing of the LM2462 in a 50Ω environment without the use of an expensive FET probe. The two 2490Ω resistors form a 200:1 divider with the 50Ω resistor and the oscilloscope. A test point is included for easy use of an oscilloscope probe. 3
4 LM2462 Typical Performance Characteristics (V CC = +80V DC,V BB = +12V DC,C L = 8pF, V OUT = 40V PP (25V 65V), T CASE = 60 C, Test Circuit - Figure 2 unless otherwise specified) DS FIGURE 6. Power Dissipation vs Frequency DS FIGURE 3. V OUT vs V IN FIGURE 4. Speed vs Temp. DS FIGURE 7. Speed vs Offset DS FIGURE 5. LM2462 Pulse Response T CASE = 50 C DS FIGURE 8. Speed vs Load Capacitance DS
5 Theory of Operation The LM2462 is a high voltage monolithic three channel CRT driver suitable for high resolution display applications. The LM2462 operates with 80V and 12V power supplies. The part is housed in the industry standard 11-lead TO-220 molded plastic power package. The circuit diagram of the LM2462 is shown in Figure 1. The PNP emitter follower, Q5, provides input buffering. Q1 and Q2 form a fixed gain cascode amplifier with resistors R1 and R2 setting the gain at 20. Emitter followers Q3 and Q4 isolate the high output impedance of the cascode stage from the capacitance of the CRT cathode which decreases the sensitivity of the device to changes in load capacitance. Q6 provides biasing to the output emitter follower stage to reduce crossover distortion at low signal levels. Figure 2 shows a typical test circuit for evaluation of the LM2462. This circuit is designed to allow testing of the LM2462 in a 50Ω environment without the use of an expensive FET probe. In this test circuit, the two 2.49kΩ resistors form a 200:1 wideband, low capacitance probe when connected to a 50Ω coaxial cable and a 50Ω load (such as a 50Ω oscilloscope input). The input signal from the generator is ac coupled to the base of Q5. Application Hints INTRODUCTION National Semiconductor (NSC) is committed to provide application information that assists our customers in obtaining the best performance possible from our products. The following information is provided in order to support this commitment. The reader should be aware that the optimization of performance was done using a specific printed circuit board designed at NSC. Variations in performance can be realized due to physical changes in the printed circuit board and the application. Therefore, the designer should know that component value changes may be required in order to optimize performance in a given application. The values shown in this document can be used as a starting point for evaluation purposes. When working with high bandwidth circuits, good layout practices are also critical to achieving maximum performance. IMPORTANT INFORMATION The LM2462 performance is targeted for the high end 19 and 21 market with resolutions up to 1600 x 1200 and an 85Hz refresh rate. The application circuits shown in this document were specifically designed to optimize the performance of the LM2462 as well as protect it from damage due to a CRT arc-over. If another member of the LM246X family is used, please refer to its datasheet. POWER SUPPLY BYPASS Since the LM2462 is a wide bandwidth amplifier, proper power supply bypassing is critical for optimum performance. Improper power supply bypassing can result in large overshoot, ringing or oscillation. 0.1 µf capacitors should be connected from the supply pins, V CC and V BB, to ground, as close to the LM2462 as is practical. Additionally, a 47 µf or larger electrolytic capacitor should be connected from both supply pins to ground reasonably close to the LM2462. ARC PROTECTION During normal CRT operation, internal arcing may occasionally occur. Spark gaps, in the range of 200V, connected from the CRT cathodes to CRT ground will limit the maximum voltage, but to a value that is much higher than allowable on the LM2462. This fast, high voltage, high energy pulse can damage the LM2462 output stage. The application circuit shown in Figure 9 is designed to help clamp the voltage at the output of the LM2462 to a safe level. The clamp diodes, D1 and D2, should have a fast transient response, high peak current rating, low series impedance and low shunt capacitance. FDH400 or equivalent diodes are recommended. Do not use 1N4148 diodes for the clamp diodes. D1 and D2 should have short, low impedance connections to V CC and ground respectively. The cathode of D1 should be located very close to a separately decoupled bypass capacitor (C3 in Figure 9). The ground connection of D2 and the decoupling capacitor should be very close to the LM2462 ground. This will significantly reduce the high frequency voltage transients that the LM2462 would be subjected to during an arcover condition. Resistor R2 limits the arcover current that is seen by the diodes while R1 limits the current into the LM2462 as well as the voltage stress at the outputs of the device. R2 should be a 1 2W solid carbon type resistor. R1 can be a 1 4W metal or carbon film type resistor. Having large value resistors for R1 and R2 would be desirable, but this has the effect of increasing rise and fall times. Inductor L1 is critical to reduce the initial high frequency voltage levels that the LM2462 would be subjected to. The inductor will not only help protect the device but it will also help optimize rise and fall times as well as minimize EMI. For proper arc protection, it is important to not omit any of the arc protection components shown in Figure 9. LM
6 LM2462 Application Hints (Continued) DS FIGURE 9. One Channel of the LM2462 with the Recommended Arc Protection Circuit OPTIMIZING TRANSIENT RESPONSE Referring to Figure 9, there are three components (R1, R2 and L1) that can be adjusted to optimize the transient response of the application circuit. Increasing the values of R1 and R2 will slow the circuit down while decreasing overshoot. Increasing the value of L1 will speed up the circuit as well as increase overshoot. It is very important to use inductors with very high self-resonant frequencies, preferably above 300 MHz. Ferrite core inductors from J.W. Miller Magnetics (part # 78-FRK) were used for optimizing the performance of the device in the NSC application board. The values shown in Figure 9 can be used as a good starting point for the evaluation of the LM2462. Using a variable resistor for R1 will simplify finding the value needed for optimum performance in a given application. Once the optimum value is determined, the variable resistor can be replaced with a fixed value. EFFECT OF LOAD CAPACITANCE Figure 8 shows the effect of increased load capacitance on the speed of the device. This demonstrates the importance of knowing the load capacitance in the application. The rise time increased about 0.08 nsec for an increase of 1 pf in the load capacitance. The fall time increased about 0.14 nsec for a 1 pf increase in the load capacitance. EFFECT OF OFFSET Figure 7 shows the variation in rise and fall times when the output offset of the device is varied from 40 to 50 V DC. The rise time varies less than 0.10 nsec. The fall time varies a little under 0.50 nsec, but only 0.15 nsec from the fastest fall time at 40V offset. THERMAL CONSIDERATIONS Figure 4 shows the performance of the LM2462 in the test circuit shown in Figure 2 as a function of case temperature. The figure shows that both the rise and fall times of the LM2462 increase by approximately 46% as the case temperature increases from 30 C to 95 C. This corresponds to a speed degradation of 7.1% for every 10 C rise in case temperature. Figure 6 shows the maximum power dissipation of the LM2462 vs. Frequency when all three channels of the device are driving an 8pF load with a 40V p-p alternating one pixel on, one pixel off. The graph assumes a 72% active time (device operating at the specified frequency) which is typical in a monitor application. The other 28% of the time the device is assumed to be sitting at the black level (65V in this case). This graph gives the designer the information needed to determine the heat sink requirement for his application. The designer should note that if the load capacitance is increased the AC component of the total power dissipation will also increase. The LM2462 case temperature must be maintained below 100 C. If the maximum expected ambient temperature is 65 C and the maximum power dissipation is 16.5W (from Figure 6, 100MHz bandwidth) then a maximum heat sink thermal resistance can be calculated: This example assumes a capacitive load of 8 pf and no resistive load. TYPICAL APPLICATION A typical application of the LM2462 is shown in Figure 10 and Figure 11. Used in conjunction with an LM1262 video pre-amp and an LM2479/2480 bias clamp, a complete video channel from monitor input to CRT cathode can be achieved. Performance is ideal for 1600 X 1200 resolution displays with pixel clock frequencies up to 230MHz. Figure 10 and Figure 11 are the schematic for the NSC demonstration board that can be used to evaluate the LM1262/2462/2480 combination in a monitor. PC BOARD LAYOUT CONSIDERATIONS For optimum performance, an adequate ground plane, isolation between channels, good supply bypassing and minimizing unwanted feedback are necessary. Also, the length of the signal traces from the preamplifier to the LM2462 and from the LM2462 to the CRT cathode should be as short as possible. The following references are recommended: Ott, Henry W., Noise Reduction Techniques in Electronic Systems, John Wiley & Sons, New York, Video Amplifier Design for Computer Monitors, National Semiconductor Application Note Pease, Robert A., Troubleshooting Analog Circuits, Butterworth-Heinemann, Because of its high small signal bandwidth, the part may oscillate in a monitor if feedback occurs around the video channel through the chassis wiring. To prevent this, leads to the video amplifier input circuit should be shielded, and input circuit wiring should be spaced as far as possible from output circuit wiring. 6
7 Application Hints (Continued) NSC DEMONSTRATION BOARD Figure 12 shows the routing and component placement on the NSC LM126X/246X demonstration board. The schematic of the board is shown in Figure 10 and Figure 11. This board provides a good example of a layout that can be used as a guide for future layouts. Note the location of the following components: C16, C19 V CC bypass capacitor, located very close to pin 4 and ground pins C17, C20 V BB bypass capacitors, located close to pin 8 and ground C46, C47, C48 V CC bypass capacitors, near LM2462 and V CC clamp diodes. Very important for arc protection. The routing of the LM2462 outputs to the CRT is very critical to achieving optimum performance. Figure 13 shows the routing and component placement from pin 1 of the LM2462 to the blue cathode. The white line through the PCB traces show the path of the blue video. Note that the components are placed so that they almost line up from the output pin of the LM2462 to the blue cathode pin of the CRT connector. This is done to minimize the length of the video path between these two components. Note also that D8, D9, R24 and D6 are placed to minimize the size of the video nodes that they are attached to. This minimizes parasitic capacitance in the video path and also enhances the effectiveness of the protection diodes. The anode of protection diode D8 is connected directly to a section of the ground plane that has a short and direct path to the LM2462 ground pins. The cathode of D9 is connected to V CC very close to decoupling capacitor C48 (see Figure 13) which is connected to the same section of the ground plane as D8. The diode placement and routing is very important for minimizing the voltage stress on the LM2462 during an arc-over event. Lastly, notice that S3 is placed very close to the blue cathode and is tied directly to CRT ground. LM
8 LM2462 Application Hints (Continued) FIGURE 10. LM126X/LM246X Demonstration Board Schematic DS
9 Application Hints (Continued) LM2462 FIGURE 11. LM126X/LM246X Demonstration Board Schematic (continued) DS
10 LM2462 Application Hints (Continued) FIGURE 12. LM126X/LM246X Demo Board Layout DS DS FIGURE 13. Trace Routing and Component Placement for Blue Channel Output 10
11 Physical Dimensions inches (millimeters) unless otherwise noted LM2462 Monolithic Triple 3 ns CRT Driver CONTROLLING DIMENSION IS INCH VALUES IN [ ] ARE MILLIMETERS NS Package Number TA11B Order Number LM2462TA LIFE SUPPORT POLICY NATIONAL S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas support@nsc.com National Semiconductor Europe Fax: +49 (0) europe.support@nsc.com Deutsch Tel: +49 (0) English Tel: +44 (0) Français Tel: +33 (0) National Semiconductor Asia Pacific Customer Response Group Tel: Fax: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: Fax: National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
12 This datasheet has been download from: Datasheets for electronics components.
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LM6142 and LM6144 17 MHz Rail-to-Rail Input-Output Operational Amplifiers General Description Using patent pending new circuit topologies, the LM6142/44 provides new levels of performance in applications
DS90LV017A LVDS Single High Speed Differential Driver
DS90LV017A LVDS Single High Speed Differential Driver General Description The DS90LV017A is a single LVDS driver device optimized for high data rate and low power applications. The DS90LV017A is a current
LM140/LM340A/LM340/LM7800C Series 3-Terminal Positive Regulators
LM140/LM340A/LM340/LM7800C Series 3-Terminal Positive Regulators General Description The LM140/LM340A/LM340/LM7800C monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal
LM7301 Low Power, 4 MHz GBW, Rail-to-Rail Input-Output Operational Amplifier in TinyPak Package
Low Power, 4 MHz GBW, Rail-to-Rail Input-Output Operational Amplifier in TinyPak Package General Description The LM7301 provides high performance in a wide range of applications. The LM7301 offers greater
Distributed by: www.jameco.com 1-800-831-4242 The content and copyrights of the attached material are the property of its owner. LM148/LM248/LM348 Quad 741 Op Amps General Description The LM148 series
LM146/LM346 Programmable Quad Operational Amplifiers
LM146/LM346 Programmable Quad Operational Amplifiers General Description The LM146 series of quad op amps consists of four independent, high gain, internally compensated, low power, programmable amplifiers.
LM117/LM317A/LM317 3-Terminal Adjustable Regulator
LM117/LM317A/LM317 3-Terminal Adjustable Regulator General Description Typical Applications May 1997 The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess
LM1558/LM1458 Dual Operational Amplifier
LM1558/LM1458 Dual Operational Amplifier General Description The LM1558 and the LM1458 are general purpose dual operational amplifiers. The two amplifiers share a common bias network and power supply leads.
LM2686 Regulated Switched Capacitor Voltage Converter
LM2686 Regulated Switched Capacitor Voltage Converter General Description The LM2686 CMOS charge-pump voltage converter operates as an input voltage doubler and a +5V regulator for an input voltage in
LM2935 Low Dropout Dual Regulator
LM2935 Low Dropout Dual Regulator General Description The LM2935 dual 5V regulator provides a 750 ma output as well as a 10 ma standby output. It features a low quiescent current of 3 ma or less when supplying
LM2660/LM2661 Switched Capacitor Voltage Converter
LM2660/LM2661 Switched Capacitor Voltage Converter General Description The LM2660/LM2661 CMOS charge-pump voltage converter inverts a positive voltage in the range of 1.5V to 5.5V to the corresponding
LM4610 Dual DC Operated Tone/Volume/Balance Circuit with National 3-D Sound
LM4610 Dual DC Operated Tone/Volume/Balance Circuit with National 3-D Sound General Description The LM4610 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car
LM4808 Dual 105 mw Headphone Amplifier
Dual 105 mw Headphone Amplifier General Description The is a dual audio power amplifier capable of delivering 105 mw per channel of continuous average power into a16ωload with 0.1% (THD+N) from a 5V power
LM3940 1A Low Dropout Regulator for 5V to 3.3V Conversion
LM3940 1A Low Dropout Regulator for 5V to 3.3V Conversion General Description The LM3940 is a 1A low dropout regulator designed to provide 3.3V from a 5V supply. The LM3940 is ideally suited for systems
LM565/LM565C Phase Locked Loop
LM565/LM565C Phase Locked Loop General Description The LM565 and LM565C are general purpose phase locked loops containing a stable, highly linear voltage controlled oscillator for low distortion FM demodulation,
LM195/LM395 Ultra Reliable Power Transistors
Ultra Reliable Power Transistors General Description The LM195/LM395 are fast, monolithic power integrated circuits with complete overload protection. These devices, which act as high gain power transistors,
LM2682 Switched Capacitor Voltage Doubling Inverter
Switched Capacitor Voltage Doubling Inverter General Description The LM2682 is a CMOS charge-pump voltage inverter capable of converting positive voltage in the range of +2.0V to +5.5V to the corresponding
LM2662/LM2663 Switched Capacitor Voltage Converter
LM2662/LM2663 Switched Capacitor Voltage Converter General Description The LM2662/LM2663 CMOS charge-pump voltage converter inverts a positive voltage in the range of 1.5V to 5.5V to the corresponding
Fast IC Power Transistor with Thermal Protection
Fast IC Power Transistor with Thermal Protection Introduction Overload protection is perhaps most necessary in power circuitry. This is shown by recent trends in power transistor technology. Safe-area,
DS2003 High Current/Voltage Darlington Drivers
DS2003 High Current/Voltage Darlington Drivers General Description The DS2003 is comprised of seven high voltage, high current NPN Darlington transistor pairs. All units feature common emitter, open collector
LM1458/LM1558 Dual Operational Amplifier
Dual Operational Amplifier General Description The LM1458 and the LM1558 are general purpose dual operational amplifiers. The two amplifiers share a common bias network and power supply leads. Otherwise,
Distributed by: www.jameco.com 1-800-831-4242 The content and copyrights of the attached material are the property of its owner. LM134/LM234/LM334 3-Terminal Adjustable Current Sources General Description
LMC7101 Tiny Low Power Operational Amplifier with Rail-To-Rail Input and Output
Tiny Low Power Operational Amplifier with Rail-To-Rail Input and Output General Description The LMC7101 is a high performance CMOS operational amplifier available in the space saving SOT 23-5 Tiny package.
DS1488 Quad Line Driver
DS1488 Quad Line Driver General Description The DS1488 is a quad line driver which converts standard TTL input logic levels through one stage of inversion to output levels which meet EIA Standard RS-232D
LM833 Dual Audio Operational Amplifier
LM833 Dual Audio Operational Amplifier General Description The LM833 is a dual general purpose operational amplifier designed with particular emphasis on performance in audio systems. This dual amplifier
LMS75LBC176 Differential Bus Transceivers
LMS75LBC176 Differential Bus Transceivers General Description The LMS75LBC176 is a differential bus/line transceiver designed for bidirectional data communication on multipoint bus transmission lines.
DS14C238 Single Supply TIA/EIA x 4 Driver/Receiver
Single Supply TIA/EIA-232 4x4Driver/Receiver General Description The DS14C238 is a four driver, four receiver device which conforms to the TIA/EIA-232-E standard and CCITT V.28 recommendations. This device
Distributed by: www.jameco.com 1-800-831-4242 The content and copyrights of the attached material are the property of its owner. LM1117/LM1117I 800mA Low-Dropout Linear Regulator General Description The
LM2907/LM2917 Frequency to Voltage Converter
LM2907/LM2917 Frequency to Voltage Converter General Description The LM2907, LM2917 series are monolithic frequency to voltage converters with a high gain op amp/comparator designed to operate a relay,
LM725 Operational Amplifier
LM725 Operational Amplifier General Description The LM725/LM725A/LM725C are operational amplifiers featuring superior performance in applications where low noise, low drift, and accurate closed-loop gain
LM1044 Analog Video Switch
LM1044 Analog Video Switch General Description Primarily intended for but not restricted to the switching of video signals the LM1044 is a monolithic DC controlled analog switch with buffered outputs allowing
LM828 Switched Capacitor Voltage Converter
LM828 Switched Capacitor Voltage Converter General Description The LM828 CMOS charge-pump voltage converter inverts a positive voltage in the range of +1.8V to +5.5V to the corresponding negative voltage