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STV9302 bảng dữ liệu(PDF) 9 Page - STMicroelectronics |
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STV9302 bảng dữ liệu(HTML) 9 Page - STMicroelectronics |
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9 / 15 page ![]() 9/15 STV9302A Application Hints 4.3.1 Centring When idle, both driver outputs provide icm and the yoke current should be null (R1 is negligible), hence: 4.3.2 Peak Current Scanning current should be IP when positive and negative driver outputs provide respectively icm -ip and icm +ip, therefore and since R7 = R2: Choose R1 in the 1Ω 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. q Example: for icm = 0.4mA, i = 0.2mA (corresponding to 0.8mA of peak-peak differential current), Ip =1A Choose R1 = 0.75Ω, it follows R2 = R7 = 1.875kΩ. 4.3.3 Ripple Rejection Make sure to connect R7 directly to the ground side of R1. 4.3.4 Secondary Breakdown Diagrams The diagram has been arbitrarily limited to max VS (35 V) and max I0 (2 A). Figure 8: Output Transistor Safe Operating Area (SOA) for Secondary Breakdown i cm R 7 ⋅ i cm R 2 therefore R 7 R 2 = ⋅ = i cm i – () R 7 ⋅ I p R 1 ⋅ i cm i + () R 2 ⋅ + = I p i ----- 2R 7 R 1 ----------- – = 100 µs 10ms 100ms 0.01 0.1 1 10 10 60 100 Volts @ Tcase=25°C 35 |
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