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BD6142AMUV
Datasheet
● The separations of the IC Power supply and coil Power supply
This IC can work in separating the power source in both IC power supply and coil power supply. With this application, it can
obtain that decrease of IC power consumption, and the applied voltage exceeds IC rating 27V.
That application is shown in below Figure 34. The higher voltage source is applied to the power source of coil that is
connected from an adapter etc. Next, the IC power supply is connected with a different coil power supply. Under the
conditions for inputting from 4.2V to 5.5V into IC VIN, please follow the recommend design in Figure 34. It connects VIN
terminal and VDC terminal together at ICOUTside.
When the coil power supply is applied, it is no any problem even though IC power supply is the state of 0V. Although IC
power supply is set to 0V, pull-down resistance is arranged for the power off which cuts off the leak route from coil power
supply in IC inside, the leak route is cut off. And, there is no power on-off sequence of coil power supply and IC power
supply.
Separate VIN and Coil power supply
4.2V to 30V
7V to 27V
10μF
10μH
2.2μF/50V
2.2μF
VOUT
10 serial x 6 parallel (60pcs)
LX
LX
FAULT
VIN
VDC
2.1V to VIN
2.2M ?
RESET
PWM
f PWM =100Hz~25kHz
ENABLE
PWM
OVP
68k ?
1k ?
22nF
COMP
BD6142AMUV
CH1
CH2
CH3
CH4
CH5
CH6
CH7
PGND
PGND
GND
TEST FSET
ABC ISET
CH8
20mA
GND
PGND
56 k ?
1nF
36k ?
Connect VIN and VDC terminals
4.2V to 30V
4.2V to 5.5V
10μF
10μH
VOUT
10 serial x 6 parallel (60pcs)
2.2μF/50V
2.2μF
LX
LX
FAULT
VIN
VDC
2.1V to VIN
2.2M ?
RESET
PWM
f PWM =100Hz~25kHz
ENABLE
PWM
OVP
68k ?
1k ?
22nF
COMP
BD6142AMUV
CH1
CH2
CH3
CH4
CH5
CH6
CH7
PGND PGND
GND TEST FSET
ABC
ISET
CH8
20mA
GND
PGND
56k ?
1nF
36k ?
Figure 34. Application at the time of power supply isolation
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
21/30
TSZ02201-0G3G0C400340-1-2
03.Dec.2012 Rev.001
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