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UC3845BDR2G Datasheet(PDF) 11 Page - ON Semiconductor |
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UC3845BDR2G Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 19 page  UC3844B, UC3845B, UC2844B, UC2845B http://onsemi.com 11 Figure 24. Current Waveform Spike Suppression + - 5.0V Ref + - S R Q 7(11) 6(10) 5(8) 3(5) RS Q1 VCC Vin C R The addition of the RC filter will eliminate instability caused by the leading edge spike on the current waveform. 7(12) Comp/Latch T Figure 25. MOSFET Parasitic Oscillations Figure 26. Bipolar Transistor Drive + - S R 5.0V Ref Q 7(11) 6(10) 5(8) 3(5) RS Q1 VCC Vin Series gate resistor Rg will damp any high frequency parasitic oscillations caused by the MOSFET input capacitance and any series wiring inductance in the gate-source circuit. 6(10) 5(8) 3(5) RS Q1 Vin C1 Base Charge Removal The totem pole output can furnish negative base current for enhanced transistor turn-off, with the addition of capacitor C1. IB + - 0 7(12) Rg Comp/Latch T + - |
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