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| BM1050AF-G Datasheet, PDF (34/51 Pages) Rohm – Quasi-Resonant Control DC/DC | |||
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BM1050AF-G
Datasheet
(6-1) gm AMP
P_VS pin monitors a divide voltage between resistors of PFC output voltage. P_VS pin is piled up ripple voltage of AC
frequency (50kHz/60kHz).
The gmAMP filters this ripple voltage and controls the voltage level of P_VSEO, by responding to error of P_VS pin voltage
P_VS pin voltage and internal reference voltage VVSAMP (typ 2.5V).
Please set cut-off frequency of filter at P_VSEO pin showed in figure 37, to about 5~10Hz.
Gm constant is designed 44[uA/V].
Figure 37. Diagram of gmAMP
(6-2)Monitor of input voltage
PFC is monitored AC input voltage at the P_BO pin.
Because the range of input voltage at P_BO pin is 0~1.8V, please select Rbo1 and Rbo2 to set P_BO voltage in the range.
Refer to block figure at figure38.
Figure 38. Diagram of Input Voltage Monitor
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TSZ02201-0F2F0A200140-1-2
10.Apr.2015 Rev.003
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