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UC2845DR2G 데이터시트(PDF) 11 Page - ON Semiconductor |
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UC2845DR2G 데이터시트(HTML) 11 Page - ON Semiconductor |
11 / 16 page UC3844, UC3845, UC2844, UC2845 http://onsemi.com 11 The MCR101 SCR must be selected for a holding of less than 0.5 mA at TA(min). The simple two transistor circuit can be used in place of the SCR as shown. All resistors are 10 k. Figure 25. MOSFET Parasitic Oscillations Figure 26. Bipolar Transistor Drive Figure 27. Isolated MOSFET Drive Figure 28. Latched Shutdown Figure 29. Error Amplifier Compensation The totem−pole output can furnish negative base current for enhanced transistor turn−off, with the addition of capacitor C1. Error Amp compensation circuit for stabilizing any current−mode topology except for boost and flyback converters operating with continuous inductor current. Error Amp compensation circuit for stabilizing current−mode boost and flyback topologies operating with continuous inductor current. 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. Q1 RS 3(5) 5(8) − R S Q Comp/Latch 5.0Vref Vin VCC 7(11) 6(10) − + + − + − + 7(12) + − Rg Q1 RS 3(5) 5(8) Vin 6(1) C1 IB + 0 − Base Charge Removal Q1 3(5) 5(8) − R S Q Comp/Latch 5.0Vref Vin VCC 7(11) 6(10) − + + − + − + 7(12) + − Np R C RS NS Isolation Boundary VGS Waveforms + 0 − + 0 − Ipk = V(pin 1) − 1.4 3 RS NP NS 50% DC 25% DC 5(9) R R Bias OSC 8(14) 4(7) 2(3) 1(1) 2R R EA + − + 1.0mA 2N 3903 2N 3905 MCR 101 5(9) 2(3) 1(1) 2R R EA + − + 1.0mA CI Rf Ri Rd From VO 2.5V 5(9) 2(3) 1(1) 2R R EA + − + 1.0mA Cp CI Rf From VO Rp Rd Ri 2.5V T Rf ≥ 8.8 k T |
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