Pulse-Width-Modulation Control Circuits
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- Raymond Welch
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1 FEATURES Complete PWM Power Control Circuitry Uncommitted Outputs for 2 Ma Sink or Source Current Output Control Selects SingleEnded or PushPull Operation Error AMP 1 NONIN INPUT IN INPUT SOP16/DIP16 (TOP IEW) NONIN INPUT IN INPUT Error AMP 2 Internal Circuitry Prohibits Double Pulse at Either Output 3 14 REF OUT ariable DeadTime Provides Control over Total Range Internal Regulator Provides a Stable 5 Reference Supply,5% Circuit Architecture Allows Easy Synchronization DEADTIME CT RT OUTPUT cc C2 GND 7 E2 8 9 E1 DESCRIPTION The incorporate on a single monolithic chip all the functions required in the construction of a pulsewidthmodulation control, these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to his application. The contains an error amplifier, an onchip adjustable oscillator, a deadtime control comparator, pulsesteering control flipflop, a 5volt, 5% precision regulator, and outputcontrol circuit. ORDERING INFORMATION Device Package D 16 SOP N 18 DIP The error amplifier exhibits a commonmode voltage range from.3 volts to cc 2 volts. The deadtime control comparator has a fixed offset that provides approximately 5% dead time when externally altered. The onchip oscillator may be bypassed by terminating R T (pin 6) to the reference output and providing a sawtooth in put to CT (pin 5), or it may be used to drive the common circuits in synchronous multiplerail power supplies. The uncommited output transistors provide either commonemitter or emitterfollower output capability. Each Device provides for pushpull or singleended output operation, which may be selected through the outputcontrol funct ion. The architecture of these devices prohibits the possibility of either output being pulsed twice during push pull operation. Functional Block Diagram OUTPUT R T C T OSCILLATOR Q1 E1 DEAD TIME.1 DEADTIME COMPARATOR Q2 C2 E2 PWM COMPARATOR PULSESTEERING FLIPFLOP ERROR AMPLIFIER NONINERTING INPUT INERTING INPUT 1 cc NONINERTING INPUT ERROR AMPLIFIER 2 REFERENCE ref INERTING INPUT GND Mar. 26Rev6 145
2 Parameter measurement information cc = 15 TEST INPUTS DEADTIME cc E1 15 Ω 2W 15 Ω 2W OUTPUT 1 OUTPUT 2 12KΩ.1uF R T C T () C2 E2 () ERROR () () 5KΩ OUTPUT REF OUT GND TEST CIRCUIT OLTAGE AT cc OLTAGE AT C2 cc OLTAGE AT C T DEADTIME INPUT THRESHOLD OLTAGE THRESHOLD OLTAGE DUTY CIRCLE.7 % MAX % Figure 1. OPERATIONAL TEST CIRCUIT AND WAEFORMS Mar. 26Rev6 146
3 AMPLIFIER UNDER TEST TERMINAL ref OTHER AMPLIFIER FIGURE 2. AMPLIFIER CHARACTERISTICS 15 (EACH OUTPUT CIRCUIT) 68 Ω 2 W OUTPUT t f t r C L =15pF (Includes probe and jig capacitance) 9% % % 9% TEST CIRCUIT OUTPUT OLTAGE WAEFORM FIGURE 3. COMMONEMITTER CONFIGURATION (EACH OUTPUT CIRCUIT) 15 9% 9% 68 Ω 2 W % % C L =15pF (Includes probe and jig capacitance) t r t f TEST CIRCUIT OUTPUT OLTAGE WAEFORM Mar. 26Rev6 FIGURE 4. EMITTERFOLLOWER CONFIGURATION 147
4 ABSOLUTE MAXIMUM RATINGS OER OPERATING FREEAIR TEMPERATURE RANGE Rating alue Unit Supply voltage, cc 41 Amplifier input voltage cc.3 Collector output voltage 41 Collector output current 25 Operating freeair temperature range to 7 Storage temperature range 65 to 15 Lead temperature 1,6 mm from case for seconds 26 o C RECOMMENDED OPERATING CONDITIONS Parameter alue MIN MAX Unit Supply voltage, cc Amplifier input voltage, i Collector output voltage, o Collector output current (each transistor) cc 2 4 Current into feedback terminal.3 Timing capacitor, C T.47 Timing resistor, R T Oscillator frequency 1 3 KHz Operating freeair temperature, T A 7 o C 2 nf KΩ Electrical characteristics over recommended operatng freeair temperature range, cc=15, f= khz(unless otherwise noted). Parameter Output voltage (ref) Input regulation Output regulation Output voltage change with temperature Shortcircuit output current*** Test Conditions* lo = 1 cc = 7 to 4 Io = 1 to T A = MIN to MAX ref = alue MIN TYP** MAX Unit m % Oscillator section (See Figure 1) Parameter Frequency Standard deviation of frequency**** Frequency change with voltage Frequency change with temperature**** Test Conditions* C T =.1μF, R T =12KΩ All values of cc, C T,R T, and T A constant cc=7 to 4, T A =25oC C T =.1μF, R T =12KΩ, T A = MIN to MAX alue MIN TYP** MAX.1 1 Unit KHz % Mar. 26Rev6 148
5 Electrical characteristics over recommended operating freeair temperature range, cc=15, f=khz (unless otherwise noted) Amplifier section (See Figure 2) SYMBOL TEST CONDITIONS MIN. TYP**. MAX. UNIT Input offset voltage o(pin 3)=2.5 2 m Input offset current o(pin 3)= na Input bias current o(pin 3)= μa Commonmode input voltage range cc = 7 to 4.3~2 Openloop voltage amplification o=3, R L =2KΩ, o=.5~ db Unitygain bandwidth o=.5~3.5, R L =2KΩ 8 khz Commonmode rejection ratio o= 4, T A = 25 o C 65 8 db Output sink current (pin 3) ID =15m~5, ( pin3 )= Output source current (pin 3) ID =15m~5, ( pin3 )=3.5 2 *For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. ** All typical values except for parameter changes with temperature are at TA =25 oc *** Duration of the shortcircuit should not exceed one second. **** Standard deviation is a measure of the statistical distribution about the mean as derived from the formula. ***** Temperature coefficient of timing capacitor and timing resistor not taken into account. Output section Collector offstate current Emitter offstate current Collectoremitter saturation voltage Commonemitter Emitterfollower Output control input current TEST CONDITIONS CE =4, cc=4 CC = C =4, E = E =, I C =2 c=15, I E =2 I =ref MIN. TYP* MAX. UNIT 2 μa Deadtime controlsection (See Figure 1) TEST CONDITIONS MIN. TYP* MAX. UNIT Input bias current(pin4) I = to μa Maximum duty cycle, each output I (pin 4) =, C T =.1uF, R T =12KΩ 45 % Input threshold voltage(pin 4) Zero duty cycle Maximum duty cycle PMW comparator section (See Figure 1) TEST CONDITIONS Input threshold voltage (pin3) Zero duty cycle Input sink current (pin 3) (pin3) =.7 MIN. TYP* MAX. UNIT Total device Standby supply current Average supply current TEST CONDITIONS MIN. TYP* MAX. Pin 6 at ref, all other inputs and outputs open CC =15 CC = I (pin 4)= UNIT Mar. 26Rev6 149
6 Switching characteristics, T A = 25 o C TEST CONDITIONS MIN. TYP* MAX. Output voltage rise time Commonemitter configuration 2 Output voltage fall time 25 Output voltage rise time Emitterfollower configuration 2 Output voltage fall time 4 * All typical values except for temperature coefficient are at T A = 25 o C UNIT ns OSCILLATOR FREQUENCY osc t (Hz) 5 k 1. k t osc R T OPENLOOP OLTAGE GAIN OL A (db) cc=15 O=3. RL=2. kω EXCESS PHASE (DEGREES) 5 1. k 5. k 2 k 5 k TIMING RESISTANCE T(Ω) R k k k 1.M FREQUENCY f(hz) 18 CE(sat) I C CE I E SATURATION OLTAGE CE (sat) () SATURATION OLTAGE CE (sat) () COLLECTOR CURRENT I c ( ) I CC CC EMITTER CURRENT I E () 9. SUPPLY CURRENT Icc () SUPPLY OLTAGE cc () 35 4 Mar. 26Rev6 15
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