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UC3842B Datasheet(PDF) 12 Page - Motorola, Inc |
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UC3842B Datasheet(HTML) 12 Page - Motorola, Inc |
12 / 16 page ![]() UC3842B, 43B UC2842B, 43B 12 MOTOROLA ANALOG IC DEVICE DATA Figure 24. Adjustable Buffered Reduction of Clamp Level with Soft–Start Figure 25. Current Sensing Power MOSFET Figure 26. Current Waveform Spike Suppression Figure 27. MOSFET Parasitic Oscillations + – + – S R + R R R 2R VClamp [ 1.67 R2 R1 ) 1 Ipk(max) [ VClamp RS 5.0V Ref Q Bias Osc EA 1.0V 5(9) 7(11) 6(10) 5(8) 3(5) RS Q1 VCC Vin 1(1) 2(3) 4(7) 8(14) R1 VClamp R2 Where: 0 ≤ VClamp ≤ 1.0 V C MPSA63 tSoft-Start +* In 1 * VC 3VClamp C R1 R2 R1 ) R2 + – 5.0V Ref + – S R Q (11) (10) (8) Comp/Latch (5) RS 1/4 W VCC Vin K M D SENSEFET G S Power Ground: To Input Source Return Control Circuitry Ground: To Pin (9) Virtually lossless current sensing can be achieved with the implementation of a SENSEFET power switch. For proper operation during over–current conditions, a reduction of the Ipk(max) clamp level must be implemented. Refer to Figures 22 and 24. VPin 5 [ RS Ipk rDS(on) rDM(on) ) RS If: SENSEFET = MTP10N10M RS = 200 Then : VPin 5 [ 0.075 Ipk 7(12) 1.0 mA Comp/Latch (12) + – 5.0V Ref + – S R Q 7(11) 6(10) 5(8) 3(5) RS Q1 VCC Vin S R 5.0V Ref 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. 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. 7(12) 7(12) Rg Comp/Latch Comp/Latch + – + – |
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