BD9610AMUV-E2 Datasheet, PDF (16/30 Pages) Rohm – 60V Synchronous Step-down Switching Regulator(Controller type)

BD9610AMUV
(12) PRE-BIAS
This IC is programmed not to sink the large current from Vout, when the Vout has been already biased high voltage
at the starting up.
But there is the potential for an increase in output voltage through Body-Di of BST charge SW when output
programmed voltage is under 10V.
So connect following resistance with feedback or discharge SW between Vo and PGND to use Vo<10V.
There is no problem as long as Vo≧10V.
Impedance
(BST-LX)
BST
SW
Body Di
REG10
CBST
LX
Vo
COUT
Fig.32 Current pass at PRE-BIAS and low setting output voltage
100.0
90.0
80.0
70.0
60.0
50.0
40.0
Unavailable area
30.0
20.0
10.0
0.0
0 2 4 6 8 10
Vo [V]
Vo[V]
1
2
3
4
5
6
7
8
8.5
9
9.5
R[kΩ]
0.56
1.25
2.14
3.33
5.00
7.50
11.67
20.00
28.33
45.00
95.00
Fig.33 setting output voltage vs load resistance
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TSZ22111・14・001
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TSZ02201-0Q1Q0AJ00010-1-2
24.OCT.2014 Rev.002