BD6590MUV
Technical Note
●Block Diagram
VBAT VBAT
FAILFLAG
SBD OPEN/
VDET
Output short PROTECT
UVLO
TSD
RSTB
Internal Reset
Output Over Voltage PROTECT
Internal Power
Supply
FAULT
DETECTOR
Internal Power
Control
PWMPOW
LED TERMINAL
OPEN/SHORT
DETECTOR
5.5V
Clamp
Soft start
ERRAMP
-
SW
SW
PWM COMP
LED1
LED2
LED3
LED4
LED5
LED6
Control
SENCE
+
LED
RETURN
SELECT
OSC
+
Current SENCE
Over Current Protect
8ch
PGND
+
-
ISET
Resistor driver
Current Driver
N.C. N.C. N.C.
OCPSET
TEST
GND
PWMDRV
ISET
GND
Fig.1 BD6590MUV block diagram
Adapter
Battery
●Application Example
4.5V to 30V
4.5V to 5.5V
10µF
4.7µH
10S × 6P
2.2µF/50V
1µF
FAILFLAG SW SW
VBAT
VBAT
1MΩ
10kΩ
PWMDRV
VDET
10KΩ
26.7kΩ
PWM
PWMPOW
fPWM=100Hz~1kHz
BD6590MUV
RESET
RSTB
TEST
LED1
LED2
LED3
LED4
LED5
LED6
OCPSET
PGND
Each 16mA
68kΩ
GND GND
ISET
27kΩ
Fig.2 Application example (10LED × 6parallel)
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© 2011 ROHM Co., Ltd. All rights reserved.
2011.07 - Rev.B
3/26
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