BD95500MUV Datasheet, PDF (15/21 Pages) Rohm – Switching Regulator with MOSFET for DDR-SDRAM Cores

BD95500MUV
Technical Note
7. Setting output voltage
This IC is operated that output voltage is REF≒VOUT.
And it is operated that output voltage is feed back to FB pin in case the output voltage is 0.7V to 2.0V.
VIN
VIN
REF
VOUT
H³Reg^TM
CONTROLLA
RQ
S
SLLM
SLLM
Driver
Circuit
Output
voltage
In case the output voltage range is 0.7V to 2.0V.
It is operated that the resistance division value of the output voltage is feed back to VOUT pin in case the output voltage is
more than 2.0V.
R1+R2
output voltage≒
×REF [V]・・・(15)
R2
And then the frequency is also in proportion to the divided ratio.
F=
R2
REF
R1+R2 ^× _VIN×tON ^{・・・(16)}
VIN
VIN
REF
VOUT
H³Reg^TM
CONTROLLA
RQ
S
SLLM
SLLM
Driver
Circuit
Output
voltage
R1
R2
In case the output voltage is more than 2.0V.
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15/20
2010.05 - Rev.C