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UC2844N 데이터시트(PDF) 10 Page - Motorola, Inc |
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UC2844N 데이터시트(HTML) 10 Page - Motorola, Inc |
10 / 14 page UC3844, 45 UC2844, 45 10 MOTOROLA ANALOG IC DEVICE DATA Figure 19. Adjustable Reduction of Clamp Level Figure 20. Soft–Start Circuit Figure 21. Adjustable Buffered Reduction of Clamp Level with Soft–Start Figure 22. 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 19 and 21. 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 µF 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 23. 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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