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| TCA62735AFLG Datasheet, PDF (7/12 Pages) Marktech Corporate – Charge Pump type DC/DC Converter for White LED Driver | |||
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TENTATIVE
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 C2OUT. Please note it.
This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 7 of 12)
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