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| TCA62735AFLG Datasheet, PDF (12/18 Pages) Marktech Corporate – Charge Pump type DC/DC Converter for White LED Driver | |||
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Method of Current Dimming control
1) Input PWM signal to SHDN terminal
ILED can be set according to the next expression.
ILED[mA] =
0.61[V] Ã 400 Ã ON Duty[%]
RSET[kâ¦]
fPWM will recommend 100Hz.
TCA62735AFLG
Ch1 : VPWM
Ch2 : IIN
Ch3 : VOUT
Ch4 : IOUT
C1=1.0µF
C2=1.0µF
C1-
C2-
C2+
GND
100
80
60
40
20
0
0
RSET=12kâ¦
PWM Duty vs . IOUT
20
40
60
80 100
PWM Duty (%)
VIN=3.6V
COUT=1.0µF
CIN=2.2µF
CTL2
CTL1
CTL0
EN
PWM signal
fPWM=100Hz, ON Duty50%
*In this PWM control operation, This IC repeats ON/OFF. In this result, rush current is occur when ON timing with
supplying charge to COUT. Please note it.
12/18 2007-06-21
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