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FSP3601SAH Datasheet(PDF) 7 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
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FSP3601SAH Datasheet(HTML) 7 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
7 / 14 page STEP-UP DC/DC CONTROLLER 2007-6-6 7/14 FSP3601 TIMING WAVEFORM DETAILED DESCRIPTION Voltage reference A 1.25V regulator operating from VCC is used to power the internal circuitry of the FSP3601. An internal resister divider provides 0.5V reference for the error amplifier, Soft-start (typ. 0.9V) and SCP (typ.0.8V). Error amplifier The error amplifier compares a sample of the dc-dc converter output voltage to the 0.5V reference and generates an error signal for the PWM comparator. Output voltage of the dc-dc converter is setting with the resistor divider using the following expression (see fig12): VOUT = (1+R1/ R2)*0.5 Figure 12. Error Amplifier with Feedback resistance divider ON SW OFF Power supply control Soft start ts Output short circuit Output short circuit tpe Short circuit detection SCP pin waveforms OUT pin waveforms Soft start setting voltage Idle period setting voltage Reference input for short circuit detection comparator COMP pin voltage 500 Vout R2 FSP3601 R1 - + Error Amplifier C1 8 36K 1 0.5V |
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