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| (R) STV8172A Vertical Deflection Booster for 3-APPTV/Monitor Applications with 70-V Flyback Generator DATASHEET Main Features Power Amplifier Flyback Generator Stand-by Control Output Current up to 3 App Thermal Protection HEPTAWATT (Plastic Package) ORDER CODE: STV8172A Description The STV8172A is a vertical deflection booster designed for TV and monitor applications. This device, supplied with up to 35 V, provides up to 3 App output current to drive the vertical deflection yoke. The internal flyback generator delivers flyback voltages up to 75 V. In double-supply applications, a stand-by state will be reached by stopping the (+) supply alone. Tab connected to pin 4 7 6 5 4 3 2 1 Input (Non Inverting) Output Stage Supply Output Ground Or Negative Supply Flyback Generator Supply Voltage Input (Inverting) Output Stage Supply 6 Flyback Generator 3 Supply Voltage 2 Non-Inverting Input Inverting Input Flyback Generator 7 + Power Amplifier 5 Output 1 Thermal Protection STV8172A 4 Ground or Negative Supply June 2004 Revision 1.3 Absolute Maximum Ratings STV8172A 1 Absolute Maximum Ratings Symbol Parameter Value Unit Voltage VS V5, V 6 V3 V1, V 7 Current I0 (1) I0 (2) I3 Sink I3 Source I3 ESD Susceptibility ESD1 ESD2 Temperature Ts Tj Storage Temperature Junction Temperature -40 to 150 +150 C C Human body model (100 pF discharged through 1.5 k) EIAJ Standard (200 pF discharged through 0 ) 2 300 kV V Output Peak Current at f = 50 to 200 Hz, t 10s - Note 4 Output Peak Current non-repetitive - Note 5 Sink Current, t<1ms - Note 3 Source Current, t < 1ms Flyback pulse current at f=50 to 200 Hz, t10s - Note 4 5 2 2 2 5 A A A A A Supply Voltage (pin 2) - Note 1 and Note 2 Flyback Peak Voltage - Note 2 Voltage at Pin 3 - Note 2, Note 3 and Note 6 Amplifier Input Voltage - Note 2, Note 6 and Note 7 40 75 -0.4 to (VS + 3) - 0.4 to (VS + 2) or +40 V V V V Note:1. Usually the flyback voltage is slightly more than 2 x V S. This must be taken into consideration when setting VS. 2. Versus pin 4 3. V3 is higher than V S during the first half of the flyback pulse. 4. Such repetitive output peak currents are usually observed just before and after the flyback pulse. 5. This non-repetitive output peak current can be observed, for example, during the Switch-On/SwitchOff 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 4, these diodes should never be forward-biased. 7. Input voltages must not exceed the lower value of either VS + 2 or 40 volts. 2 Thermal Data Symbol RthJC TT TJ Parameter Junction-to-Case Thermal Resistance Temperature for Thermal Shutdown Recommended Max. Junction Temperature Value 3 150 120 Unit C/W C C 2/14 STV8172A Electrical Characteristics 3 Electrical Characteristics (V S = 34 V, TAMB = 25C, unless otherwise specified) Symbol Supply VS I2 I6 Input I1 I7 VIR VI0 VI0/dt Output I0 V5L V5H Stand-by V5STBY Parameter Test Conditions Min. Typ. Max. Unit Fig. Operating Supply Voltage Range (V2-V4) Pin 2 Quiescent Current Pin 6 Quiescent Current Note 8 I3 = 0, I5 = 0 I3 = 0, I5 = 0, V6 =35v 10 5 8 19 35 20 50 V mA mA 1 1 Input Bias Current Input Bias Current Operating Input Voltage Range Offset Voltage Offset Drift versus Temperature V1 = 1 V, V7 = 2.2 V V1 = 2.2 V, V7 = 1 V 0 - 0.6 - 0.6 -1.5 -1.5 VS - 2 A A 1 V mV V/C 2 10 Operating Peak Output Current Output Saturation Voltage to pin 4 Output Saturation Voltage to pin 6 0o 1.7 2.3 A V V 3 2 Output Voltage in Stand-by V1 = V7 = VS = 0 See Note 9 VS - 2 V Miscellaneous G VD5-6 VD3-2 V3SL V3SH Voltage Gain Diode Forward Voltage Between pins 5-6 Diode Forward Voltage between pins 3-2 Saturation Voltage on pin 3 Saturation Voltage to pin 2 (2nd part of flyback) I5 = 1.5 A I3 = 1.5 A I3 = 20 mA I3 = -1.5 A 80 1.8 1.6 0.4 2.1 2.3 2.2 1 2.8 dB V V V V 3 8. In normal applications, the peak flyback voltage is slightly greater than 2 x (VS - V 4). Therefore, (VS - V 4) = 35 V is not allowed without special circuitry. 9. Refer to Figure 4, Stand-by condition. 3/14 Electrical Characteristics STV8172A Figure 1: Measurement of I 1, I2 and I6 +Vs I2 2 7 I6 6 5 2.2V STV8172A S 1 4 39k (a) (b) I1 1V 5.6k (a): I2 and I6 measurement (b): I1 measurement Figure 2: Measurement of V5H +Vs 2 7 6 V5H 5 - I5 4 2.2V STV8172A 1 1V Figure 3: Measurement of V3L and V5L +Vs 2 7 6 (b) 3 I3 or I5 (a) 1V STV8172A 5 1 2.2V 4 V3L V5L (a): V5L measurement (b): V 3L measurement 4/14 STV8172A Application Hints 4 Application Hints The yoke can be coupled either in AC or DC. 4.1 DC-coupled Application When DC coupled (see Figure 4), the display vertical position can be adjusted with input bias. On the other hand, 2 supply sources (VS and -VEE ) 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 4: DC-coupled Application +Vs Vref Vertical Position Adjustment VM Vm R3 -VEE 4 (*) recommended: Ly Ly ------------- < Rd < -----------20s 50s 4.1.1 Application Hints For calculations, treat the IC as an op-amp, where the feedback loop maintains V 1 = V7. 000000000000000000 0000000000000000 000000000000000000 470F 0.1F R2 0.22F 000000000 000000000 470F 0.1F 6 Power Amplifier 7 + CF (47 to 100F) Output Voltage 3 2 Flyback Generator Output Current Ip 000000000 000000000 5 1 Thermal Safety 1.5 Rd(*) Yoke Ly R1 5/14 Application Hints 4.1.1.1 Centering STV8172A Display will be centered (null mean current in yoke) when voltage on pin 7 is (R1 is negligible): V7 2 x + --- -- - -- - - -- - - - -- --- - 4.1.1.2 Peak Current Example: for V m = 2 V, VM = 5 V and IP = 1 A Choose R1 in the1 range, for instance R1=1 2 x IP x R1 V M V m Then choose R2 or R3. For instance, if R2 = 10 k, then R3 = 15 k Finally, the bias voltage on pin 7 should be: V +V 71 M m 1 V 7 = ------------------------ x ----------------- = --- x ------- = 1.4V 2 2.5 R 2 3 1 + ------R2 4.1.2 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 5), 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 (R8 / R7) = (R3 / R2), and connect the bias filtering capacitor between the intermediate point and the local driver ground. Of course, R7 should be connected to the booster reference point, which is the ground side of R1. Figure 5: Ripple Rejection Reference Voltage Power Amplifier 7 + 5 1 Thermal Safety 4 Rd Yoke Ly R9 R8 R7 Ramp Signal R3 R2 Source of Ripple 6/14 00000000 Driver Ground 000000 - -- = ---------------------------- = ------- From equation of peak current: = IP ------------------------ = + R2 R 3 VM Vm R2 R2 R3 ( VM Vm ) R2 ---------------------------- x -----------------R 1 xR 3 2 - 2 3 6 3 2 Flyback Generator 00000000 00000000 R1 STV8172A Application Hints 4.2 AC-Coupled Applications In AC-coupled applications (See Figure 6), only one supply (VS ) 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 Vm (*) recommended: Ly Ly ------------ < Rd < ------------50s 20s 4.2.1 Application Hints Gain is defined as in the previous case: p 2 R1 x R3 VM Vm R2 Choose R1 then either R2 or R3. For good output centering, V 7 must fulfill the following equation: VS VM + Vm ------- V ------------------------ V V 7 7 7 2 2 --------------------- = ------------------------------------- + ------R +R R R 4 5 3 2 or VM + Vm VS 1 1 1 V x ------- + ------- + --------------------- = ------------------------------ + -----------------------7 R2 R + R 2 (R 4 + R5 ) 2 x R3 R 3 4 5 --------------------- I x 000000000 00000000 R5 Cs R2 R1 000000000 4 R4 0.22F VM R3 ----------------------- = - - 000000000 - 000000000 000000000 000000000 470F 0.1F 6 CF (47 to 100F) +Vs Output Voltage 3 2 Flyback Generator Output Current Ip Power Amplifier 7 + 5 1 Thermal Safety 1.5 Rd(*) Yoke Ly CL 7/14 Application Hints STV8172A CS performs an integration of the parabolic signal on CL, therefore the amount of S correction is set by the combination of CL and Cs. 4.3 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 7: Using a Differential-output Driver +Vs Differential output driver IC Power Amplifier ip icm + R7 1 icm - -VEE 4 Let us set some definitions: icm is the common-mode current: 1 i cm = -- ( i + + i - ) 2 at peak of signal, i+ = icm + ip and i- = icm - ip, therefore the peak differential signal is ip - (ip) = 2 ip, and the peak-peak differential signal, 4ip. The application is described in Figure 7 with DC yoke coupling. The calculations still rely on the fact that V1 remains equal to V7. 8/14 000000000000000000 (*) recommended: Ly Ly ------------- < Rd < ------------20 s 50s 000000000000000000 000000000000000000 470F 0.1F R2 0.22F -ip 000000000 000000000 000000000 470F 0.1F 6 CF (47 to 100F) Output Voltage 3 2 Flyback Generator Output Current Ip 7 + 5 - Thermal Safety 1.5 Rd(*) Yoke Ly R1 STV8172A 4.3.1 Centring Application Hints When idle, both driver outputs provide icm and the yoke current should be null (R1 is negligible), hence: i cm R 7 = i cm R 2 therefore R 7 = R 2 4.3.2 Peak Current Scanning current should be IP when positive and negative driver outputs provide respectively icm - ip and icm + ip, therefore Choose R1 in the 1 range, the value of R2 = R7 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 icm = 0.4mA, i = 0.2mA (corresponding to 0.8mA of peak-peak differential current), Ip = 1A Choose R1 = 0.75, it follows R2 = R7 = 1.875k. 4.3.3 Ripple Rejection Make sure to connect R7 directly to the ground side of R1. 4.3.4 Secondary Breakdown Diagrams Figure 8: Output Transistor Safe Operating Area (SOA) for Secondary Breakdown The diagram has been arbitrarily limited to max I0 (2 A). - cm - (i i) R 7 = I R + (i + i ) R and since R7 = R2: p 1 cm 2 Ip ---- = i 2R 7 ---------R1 9/14 Mounting Instructions STV8172A Figure 9: Secondary Breakdown Temperature Derating Curve (ISB = Secondary Breakdown Current) 5 Mounting Instructions The power dissipated in the circuit is removed by adding an external heatsink. With the HEPTAWATTTM 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 10: Mounting Examples 10/14 STV8172A Pin Configuration 6 Pin Configuration Figure 11: Pins 1 and 7 2 1 7 Figure 12: Pin 3 & Pins 5 and 6 2 6 2 5 3 4 11/14 Package Mechanical Data STV8172A 7 Package Mechanical Data Figure 13: 7-pin Heptawatt Package L E L1 M1 A C D1 L2 L5 L3 E E1 F D M H2 V4 L9 H3 Dia. G G1 G2 F L10 L11 L7 L6 L4 H2 Table 1: Heptawatt Package mm Dim. Min. A C D D1 E E1 F G G1 G2 H2 H3 L 10.05 16.70 16.90 2.40 1.20 0.35 0.70 0.60 2.34 4.88 7.42 2.54 5.08 7.62 inches Max. 4.8 1.37 2.80 1.35 0.55 0.97 0.80 2.74 5.28 7.82 10.40 10.40 17.10 0.396 0.657 0.668 0.094 0.047 0.014 0.028 0.024 0.095 0.193 0.295 0.100 0.200 0.300 Typ. Min. Typ. Max. 0.189 0.054 0.110 0.053 0.022 0.038 0.031 0.105 0.205 0.307 0.409 0.409 0.673 12/14 STV8172A Table 1: Heptawatt Package (Continued) mm Dim. Min. L1 L2 L3 L4 L5 L6 L7 L9 L10 L11 M M1 V4 Dia. 3.65 3.85 2.10 4.30 2.55 4.83 2.80 5.08 2.60 15.10 6.00 2.80 15.50 6.35 0.20 2.70 4.80 3.05 5.33 40 (Typ.) 0.144 0.082 0.169 0.100 0.190 21.24 22.27 Package Mechanical Data inches Max. 21.84 22.77 1.29 3.00 15.80 6.60 0.102 0.594 0.0236 0.110 0.610 0.250 0.008 0.106 0.190 0.110 0.200 0.120 0.210 0.152 Typ. 14.92 21.54 22.52 Min. 0.386 0.877 Typ. 0.587 0.848 0.891 Max. 0.860 0.896 0.051 0.118 0.622 0.260 13/14 Revision History STV8172A 8 Revision History Table 2: Summary of Modifications Version 1.0 1.1 1.2 1.3 Date August 2003 November 2003 December 2003 June 2004 First Issue. Description Datasheet status changed to preliminary data. Modification to Figure 11. Datasheet status changed to datasheet. 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 All other names are the property of their respective owners (c) 2004 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States www.st.com 14/14 |
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