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NCP1654BD133R2G Datasheet(PDF) 18 Page - ON Semiconductor |
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NCP1654BD133R2G Datasheet(HTML) 18 Page - ON Semiconductor |
18 / 23 page NCP1654 http://onsemi.com 18 Soft Start The block diagram and timing diagram of soft start function are as shown in Figure 42 and Figure 43. The device provides no output (or no duty ratio) when the Vcontrol is lower than VCONTROL(min). Vcontrol is pulled low when: • Brown−out, or • Undervoltage Protection When the IC recovers from one of the following conditions; Undervoltage Lockout, Brown−out or Undervoltage Protection, the 200 mA current source block keeps off. Hence only the Operating Trans−conductance Amplifier (OTA) raises the Vcontrol. And Vcontrol rises slowly. This is to obtain a slow increasing duty cycle and hence reduce the voltage and current stress on the MOSFET. A soft−start operation is obtained. Figure 42. Soft Start Block Diagram + - + - 95% VREF VREF OTA Vfb 6 5 Vcontrol Vout Low Detect 200 mA Vdd ±20 mA Q Q S R Bias Vdd Off UVP UVLO BO UVLO BO 95% VREF Figure 43. Soft Start Timing Diagram Period I Period II UVLO, BO, or UVP Vdd Vdd Rising Vfb Set Reset Q Vout Low Detect |
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