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BD9E101FJ-LB Datasheet, PDF (22/33 Pages) Rohm – 7.0V to 36V Input, 1.0 A Integrated MOSFET Single Synchronous Buck DC/DC Converter | |||
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BD9E101FJ-LB
2. Output Voltage Set Point
The output voltage value can be set by the feedback resistance ratio.
VOUT
R1
R2
ï¼
FB
ERR
ï¼
1.0V
VOUT
=
R1 + R2
R2
à 1.0
[V]
â» Minimum pulse range that can be produced at the output
stably through all the load area is 150nsec for
BD9E101FJ-LB.
Use input/output condition which satisfies the following
method.
Figure 47. Feedback Resistor Circuit
150(nsec) ⤠VOUT
V IN Ã FOSC
3. Input voltage start-up
VIN
UVLO
release
ï¼6.6Vtyp.)
VIN â§
VOUTÃ0.85
0.7
VOUT
VOUTÃ0.85
TSS
Figure 48. Input Voltage Start-up Time
Soft-start function is designed for the IC so that the output voltage will start according to the time it was decided internally.
After UVLO release, the output voltage range will be less than 70% of the input voltage at soft-start operation. Please be
sure that the input voltage of the soft-start after startup is as follows.
V IN
â¥VOUT à 0.85
0.7
[V]
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TSZ02201-0J3J0AJ00390-1-2
21.Feb.2014 Rev.002
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