BD6590MUV
Technical Note
●Application example of Analog dimming
Control LED current to charged D/A voltage.
Show application example and typ control.
Please decide final value after you evaluated application, characteristic.
Coil Power
4.5V to 30V
Battery or adapter
4.5V to 5.5V
10µF
4.7µH
10LED ×6p ar al l el
2.2µF
/ 50V
1µF
VDET
PWMDRV
fPWM=100Hz~1kHz
PWM
RESET
PWMPOW BD6590MUV
LED1
LED2
LED3
LED4
LED5
LED6
RSTB
TEST
OCPSET
68k
Ω
470k
Ω
22k
Ω
D/A
432
470kꢀ
432
22kꢀ
DAC
ISETvoltage
LEDcurrent =
+
+
1-
1-
432
470kꢀ
432
22kꢀ
DAC
0.6V
typ LEDcurrent =
Fig.34 BD6590MUV Analog style optical application
www.rohm.com
2011.07 - Rev.B
25/26
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