Vertical Deflection Booster for 2-A PP TV/Monitor Applications with 70-V Flyback Generator. Supply. Power Amplifier. Ground or Negative Supply

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1 Vertical Deflection Booster for 2-A PP TV/Monitor Applications with 0-V Flyback Generator Main Features Power Amplifier Flyback Generator Current up to 2 App Thermal Protection Stand-by Control HEPTAWATT (Plastic Package) ORDER CODE: Description The is a vertical deflection booster designed for TV and monitor applications. This device, supplied with up to 3 V, provides up to 2 App output current to drive the vertical deflection yoke. The internal flyback generator delivers flyback voltages up to 0 V. in double-supply applications, a stand-by state will be reached by stopping the (+) supply alone. Tab connected to pin Input (Non Inverting) Stage Supply Ground Or Negative Supply Flyback Generator Supply Voltage Input (Inverting) Stage Supply 6 Flyback Generator 3 Supply Voltage 2 Non-Inverting Input Inverting Input + Power Amplifier - Thermal Protection Flyback Generator Ground or Negative Supply September 2003 /

2 Absolute Maximum Ratings Absolute Maximum Ratings Symbol Parameter Value Unit Voltage V S Supply Voltage (pin 2) - Note and Note 2 0 V V, V 6 Flyback Peak Voltage - Note 2 0 V V 3 Voltage at Pin 3 - Note 2, Note 3 and Note 6-0. to (V S + 3) V V, V Amplifier Input Voltage - Note 2, Note 6 and Note - 0. to (V S + 2) or +0 V Current I 0 () Peak Current at f = 0 to 200 Hz, t 0µs - Note ± A I 0 (2) Peak Current non-repetitive - Note ±2 A I 3 Sink Sink Current, t<ms - Note 3. A I 3 Source Source Current, t < ms. A I 3 Flyback pulse current at f=0 to 200 Hz, t 0µs - Note ± A ESD Susceptibility ESD Human body model (00 pf discharged through. kω) 2 kv ESD2 EIAJ Standard (200 pf discharged through 0 Ω) 300 V Temperature T s Storage Temperature -0 to 0 C T j Junction Temperature +0 C Note:. Usually the flyback voltage is slightly more than 2 x V S. This must be taken into consideration when setting V S. 2. Versus pin 3. V3 is higher than V S during the first half of the flyback pulse.. Such repetitive output peak currents are usually observed just before and after the flyback pulse.. This non-repetitive output peak current can be observed, for example, during the Switch-On/Switch- Off phases. This peak current is acceptable providing the SOA is respected (Figure 8 and Figure 9). 6. All pins have a reverse diode towards pin, these diodes should never be forward-biased.. Input voltages must not exceed the lower value of either V S + 2 or 0 volts. 2 Thermal Data Symbol Parameter Value Unit R thjc Junction-to-Case Thermal Resistance 3 C/W T T Temperature for Thermal Shutdown 0 C T J Recommended Max. Junction Temperature 20 C 2/

3 3 Electrical Characteristics Electrical Characteristics (V S = 32 V, T AMB = 2 C, unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit Fig. Supply Input V S Operating Supply Voltage Range (V 2 -V ) Note V I 2 Pin 2 Quiescent Current I 3 = 0, I = 0 20 ma I 6 Pin 6 Quiescent Current I 3 = 0, I = 0, V 6 =3v ma I Input Bias Current V = V, V = 2.2 V µa I Input Bias Current V = 2.2 V, V = V µa V IR Operating Input Voltage Range 0 V S - 2 V V I0 Offset Voltage 2 mv V I0 /dt Offset Drift versus Temperature 0 µv/ C I 0 Operating Peak Current ± A V L Saturation Voltage to pin I = A. V 3 V H Saturation Voltage to pin 6 I = - A V 2 Stand-by V STBY Miscellaneous Voltage in Stand-by V = V = V S = 0 See Note 9 V S - 2 G Voltage Gain 80 db V D-6 Diode Forward Voltage Between pins -6 I = A. 2 V V D3-2 Diode Forward Voltage between pins 3-2 I 3 = A.3 2 V V 3SL Saturation Voltage on pin 3 I 3 = 20 ma 0. V 3 V 3SH Saturation Voltage to pin 2 (2nd part of flyback) I 3 = - A 2. V V 8. In normal applications, the peak flyback voltage is slightly greater than 2 x (V S - V ). Therefore, (V S - V ) = 3 V is not allowed without special circuitry. 9. Refer to Figure, Stand-by condition. 3/

4 Electrical Characteristics Figure : Measurement of I, I 2 and I 6 +Vs I2 I V S 39kΩ (a) (b) (a): I2 and I6 measurement (b): I measurement V I.6kΩ Figure 2: Measurement of V H +Vs 2 6 V H 2.2V V - I Figure 3: Measurement of V 3L and V L +Vs 2 6 I3 or I V 2.2V (b) 3 V 3L (a) V L (a): V L measurement (b): V 3L measurement /

5 Application Hints Application Hints The yoke can be coupled either in AC or DC.. DC-coupled Application When DC coupled (see Figure ), the display vertical position can be adjusted with input bias. On the other hand, 2 supply sources (V S and -V EE ) are required. A Stand-by state will be reached by switching OFF the positive supply alone. In this state, where both inputs are the same voltage as pin 2 or higher, the output will sink negligible current from the deviation coil. Figure : DC-coupled Application 0µF 0.µF C F ( to 00µF) +Vs Voltage Vertical Position Adjustment Vref Power Amplifier Flyback Generator Current I p V M R3 - Thermal Safety.Ω Rd(*) Yoke V m -V EE 0.22µF 0µF µF R2 R (*) recommended: < R d 0µs < µs Application Hints For calculations, treat the IC as an op-amp, where the feedback loop maintains V = V. /

6 Application Hints... Centering Display will be centered (null mean current in yoke) when voltage on pin is (R is negligible): V M + V m R 2 V = ÿr 2 + R 3 þ...2 Peak Current ( V M V m ) R 2 I P = R xr 3 Example: for V m =2V, V M = V and I P =A Choose R in the Ω range, for instance R = Ω From equation of peak current: R R 3 = 2 I P R = V M V m Then choose R 2 or R 3. For instance, if R 2 = 0 kω, then R 3 = kω Finally, the bias voltage on pin should be: V + V M m V = = 2 R R =.V Ripple Rejection When both ramp signal and bias are provided by the same driver IC, you can gain natural rejection of any ripple caused by a voltage drop in the ground (see Figure ), if you manage to apply the same fraction of ripple voltage to both booster inputs. For that purpose, arrange an intermediate point in the bias resistor bridge, such that (R 8 / R ) = (R 3 / R 2 ), and connect the bias filtering capacitor between the intermediate point and the local driver ground. Of course, R should be connected to the booster reference point, which is the ground side of R. Figure : Ripple Rejection Reference Voltage 6 Power Amplifier 3 2 Flyback Generator + R 9 R 8 R Thermal Safety Rd Yoke Ramp Signal Driver Ground R 3 R 2 Source of Ripple R 6/

7 Application Hints.2 AC-Coupled Applications In AC-coupled applications (See Figure 6), only one supply (V S ) is needed. The vertical position of the scanning cannot be adjusted with input bias (for that purpose, usually some current is injected or sunk with a resistor in the low side of the yoke). Figure 6: AC-coupled Application 0µF 0.µF C F ( to 00µF) +Vs Voltage Power Amplifier 3 2 Flyback Generator Current I p + V M R 3 - Thermal Safety.Ω Rd(*) Yoke V m µF R C s R C L (*) recommended: < R d < µs 20µs R 2 R Application Hints Gain is defined as in the previous case: V V R M m I p = R R 3 Choose R then either R 2 or R 3. For good output centering, V must fulfill the following equation: V V + V S V V 2 M m V = R + R R 3 R 2 or V V + V S M m V ÿ R R 3 2 R = R þ 2R ( ÿ + R ) 2 R 3 þ /

8 Application Hints C S performs an integration of the parabolic signal on C L, therefore the amount of S correction is set by the combination of C L and C s..3 Application with Differential-output Drivers Certain driver ICs provide the ramp signal in differential form, as two current sources i + and i with opposite variations. Figure : Using a Differential-output Driver 0µF 0.µF C F ( to 00µF) +Vs Voltage Differential output driver IC -V EE Power Amplifier 3 2 Flyback Generator i p + i cm + R Thermal Safety.Ω -i i p - cm µF Current Rd(*) I p Yoke 0µF 0.µF R 2 (*) recommended: < Rd< µs 20µs R Let us set some definitions: i cm is the common-mode current: i cm = --i ( i - ) at peak of signal, i + =i cm +i p and i =i cm -i p, therefore the peak differential signal is i p -(- i p )=2i p, and the peak-peak differential signal, i p. The application is described in Figure with DC yoke coupling. The calculations still rely on the fact that V remains equal to V. 8/

9 Application Hints.3. Centring When idle, both driver outputs provide i cm and the yoke current should be null (R is negligible), hence: i cm R = i cm R 2 therefore R = R Peak Current Scanning current should be I P when positive and negative driver outputs provide respectively i cm -i p and i cm +i p, therefore ( i cm i) R = I p R + ( i cm + i) R 2 and since R = R 2 : I p ---- i = 2R R Choose R in the Ω range, the value of R 2 = R follows. Remember that i is one-quarter of driver peak-peak differential signal! Also check that the voltages on the driver outputs remain inside allowed range. Example: for i cm = 0.mA, i = 0.2mA (corresponding to 0.8mA of peak-peak differential current), I p =A Choose R = 0.Ω, it follows R 2 = R =.8kΩ..3.3 Ripple Rejection Make sure to connect R directly to the ground side of R..3. Secondary Breakdown Diagrams Figure 8: Transistor Safe Operating Area (SOA) for Secondary Tcase=2 C 0 00ms 00µs 0ms Ic(A) Volts The diagram has been arbitrarily limited to max VS (3 V) and max I0 (2 A). 9/

10 Mounting Instructions Figure 9: Secondary Breakdown Temperature Derating Curve (ISB = Secondary Breakdown Current) Mounting Instructions The power dissipated in the circuit is removed by adding an external heatsink. With the HEPTAWATT package, the heatsink is simply attached with a screw or a compression spring (clip). A layer of silicon grease inserted between heatsink and package optimizes thermal contact. In DCcoupled applications we recommend to use a silicone tape between the device tab and the heatsink to electrically isolate the tab. Figure 0: Mounting Examples 0/

11 6 Pin Configuration Pin Configuration Figure : Pins and 2 Figure 2: Pin 3 & Pins and /

12 Package Mechanical Data Package Mechanical Data Figure 3: -pin Heptawatt Package L L E M A C D L2 D M H2 L L3 E F E L9 V H3 G G G2 Dia. L0 L H2 F L L L6 Table : Heptawatt Package mm inches Dim. Min. Typ. Max. Min. Typ. Max. A C D D E E F G G G H H L /

13 Package Mechanical Data Table : Heptawatt Package (Continued) mm inches Dim. Min. Typ. Max. Min. Typ. Max. L L L L L L L L L L M M V 0 (Typ.) Dia /

14 Revision History 8 Revision History Table 2: Summary of Modifications Version Date Description 2.0 January 2002 First Issue. 2. November 2002 Addition of Stand-by Control information, Section 8: Revision History. 2.2 April 2003 Correction to Section...2: Peak Current. Creation of new title, Section.3.: Secondary Breakdown Diagrams. /

15 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. /

STV8172A. Vertical deflection booster for 3 App TV/monitor applications with 70 V flyback generator. Features. Description STV8172A.

STV8172A. Vertical deflection booster for 3 App TV/monitor applications with 70 V flyback generator. Features. Description STV8172A. STV82A Vertical deflection booster for 3 App TV/monitor applications with 0 V flyback generator Features Figure. Heptawatt package Power amplifier Flyback generator Stand-by control Output current up to