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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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R1211D103C 데이터시트(PDF) 12 Page - RICOH electronics devices division |
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R1211D103C 데이터시트(HTML) 12 Page - RICOH electronics devices division |
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12 / 40 page  R1211x 12 TIMING CHART • R1211x002A/R1211x002C R1 R2 VOUT VFB VREF AMPOUT SS DTC EXT PWM Comparator EXT OP AMP • R1211x002B/R1211x002D R1 R2 VOUT VFB VREF AMPOUT SS DTC EXT PWM Comparator EXT OP AMP <Soft-start Operation> Soft-start operation is starting from power-on as follows: (Step1) The voltage level of SS is rising gradually by constant current circuit of the IC and a capacitor. VREF level which is input to OP AMP is also gradually rising. VOUT is rising up to input voltage level just after the power-on, therefore, VFB voltage is rising up to the setting voltage with input voltage and the ration of R1 and R2. AMPOUT is at "L", and switching does not start. (Step2) When the voltage level of SS becomes the setting voltage with the ration of R1 and R2 or more, switching operation starts. VREF level gradually increases together with SS level. VOUT is also rising with balancing VREF and VFB. Duty cycle depends on the lowest level among AMPOUT, SS, and DTC of the 4 input terminals in the PWM comparator. |
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