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UC3842BDG Datasheet(PDF) 13 Page - ON Semiconductor |
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UC3842BDG Datasheet(HTML) 13 Page - ON Semiconductor |
13 / 22 page UC3842B, UC3843B, UC2842B, UC2843B http://onsemi.com 13 + - + - 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 tSoftStart +* In 1 * VC 3 VClamp C R1 R2 R1 ) R2 7(12) 1.0 mA Comp/Latch 5.0V Ref + - S R Q Bias + 1.0mA Osc R R R 2R EA 1.0V 5(9) 1(1) 2(3) 4(7) 8(14) C 1.0M tSoft-Start ≈ 3600C in mF Figure 25. Soft−Start Circuit Figure 26. Adjustable Buffered Reduction of Clamp Level with Soft−Start + - 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 24 and 26. VPin 5 [ RS Ipk rDS(on) rDM(on) ) RS If: SENSEFET = MTP10N10M RS = 200 Then : VPin5 [ 0.075 Ipk (12) Figure 27. Current Sensing Power MOSFET + - 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 Figure 28. Current Waveform Spike Suppression |
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