TCA62735AFLG Datasheet, PDF (10/12 Pages) Marktech Corporate – Charge Pump type DC/DC Converter for White LED Driver

TENTATIVE
TCA62735AFLG
Selection of an output number by CTL0, CTL1, and CTL2 Terminal





Truth Table
Input
CTL2
CTL1
CTL0
EN
L
L
L
H
L
L
H
H
L
H
L
H
L
H
H
H
H
L
L
H
H
L
H
H
H
H
L
H
H
H
H
H
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
L
ILED4
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Output
ILED3
ILED2
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ILED1
ON
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
*Soft Start Function
This device is integrated Soft start function. When the power supply is ON or output is started to operate, the transition
time is controlled in order to decrease the rush current. (Reference data: The output voltage is time 200µs of made from
0 to 4.0V at the V_IN=2.8V time.)
*Inrush Current of Input Current
The inrush current flows when start-up and mode switching. (Reference data: Inrush current at CE1/CE2="L" to “H” is
500mA.)
*Thermal Shut Down Function
This device has Thermal Shutdown Function to protect from thermal damage when the output is shorted.
The temperature to operate this function is set around from 140 to 160°C. (This is not guaranteed Value.)
*The Selection of Capacitor for Charge Pump, Input and Output
The input capacitor is effective to decrease the impedance of power supply and also input current is averaged.
The input capacitor should be selected by impedance of power supply, it is better to choose with lower ESR
(Equivalent Series Resistor). (i.e. ceramic capacitor etc.) Regarding to the capacitance values, it is recommended to
choose in the range from 0.8 µF to 10 µF, however larger than 2.2 µF should be better.
The output capacitor is effective to decrease the ripple noise of the output line.
Also, it is better to choose the
capacitor.) Regarding to the capacitance values, it is recommended to
choose in the range from 0.8 µF to 4.7 µF, however larger than 2.2 µF should be better.
The capacitor for charge pump operation is also selected the capacitor with low ESR. .) Regarding to the
capacitance values, it is recommended to choose in the range from 0.8 µF to 2.2 µF, however larger than 1.0 µF should
be better.
This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 10 of 12)