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BD8119FM-M
● Procedure for external components selection
Follow the steps as shown below for selecting the external components
Technical Note
1.
Work out IL_MAX from the operating conditions.
2.
3.
4.
5.
6.
7.
8.
9.
Select the value of RSC such that IOCP > IL_MAX
Select the value of L such that 0.05/μs < VOUT / L < 0.3V/ μs
Select coil, schottky diodes, MOSFET and RCS which meet with the ratings
Select the output capacitor which meets with the ripple voltage requirements
Select the input capacitor
Work on with the compensation circuit
Work on with the Over-Voltage Protection (OVP) setting
Work on with the soft-start setting
10.
Verify experimentally
Feedback the value of L
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? 2011 ROHM Co., Ltd. All rights reserved.
11/20
2011.08 - Rev.B
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