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UC2844N 데이터시트(PDF) 10 Page - ON Semiconductor |
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10 / 16 page UC3844, UC3845, UC2844, UC2845 http://onsemi.com 10 Figure 20. Adjustable Reduction of Clamp Level Figure 21. Soft−Start Circuit Figure 22. Adjustable Buffered Reduction of Clamp Level with Soft−Start Figure 23. Current Sensing Power MOSFET Virtually lossless current sensing can be achieved with the implement 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 20 and 22. 5(9) R R Bias OSC 8(14) 4(7) 2(3) 1(1) 2R R EA + − + Q1 RS 3(5) 5(8) 1.0V − R S Q Comp/Latch 5.0Vref VClamp Vin VCC 7(11) 6(10) − + + − + − + 7(12) + − R1 R2 R2 VClamp 1.67 + 1 + 0.33 x 10−3 Ipk(max) ≈ VClamp RS Where: 0 ≤ VClamp ≤ 1.0 V R2 R1 1.0mA R1 R1 + R2 5(9) R R Bias OSC 8(14) 4(7) 2(3) 1(1) 2R R EA + − + 1.0V − R S Q 5.0Vref − + + − + C tSoft−Start 3600C in mF 1.0mA 5(9) R R Bias OSC 8(14) 4(7) 2(3) 1(1) 2R R EA + − + Q1 RS 3(5) 5(8) 1.0V − R S Q Comp/Latch 5.0Vref VClamp Vin VCC 7(11) 6(10) − + + − + − + 7(12) + − MPSA63 R1 R2 C tSoftstart = − In 1 − VC R1 R2 C R2 VClamp 1.67 + 1 Ipk(max)≈ VClamp RS Where: 0 ≤ VClamp ≤ 1.0 V 1.0mA R1 3VClamp R1 + R2 RS 1/4 W (5) (8) − R S Q Comp/Latch 5.0Vref Vin VCC (11) (10) − + + − + − + (12) + − Power Ground To Input Source Return VPin 5 ≈ If: SENSEFET = MTP10N10M RS = 200 Then: Vpin 5 = 0.075 Ipk SENSEFET RS Ipk rDS(on) M G D S K Control CIrcuitry Ground: To Pin (9) rDM(on) + RS + 0.33 x 10−3 R1 R2 R1 + R2 Figure 24. Current Waveform Spike Suppression The addition of the RC filter will eliminate instability caused by the leading edge spike on the current waveform. Q1 RS 3(5) 5(8) − R S Q Comp/Latch 5.0Vref Vin VCC 7(11) 6(10) − + + − + − + 7(12) + − R C T T T T T |
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