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W-52TDI-GT Datasheet(PDF) 6 Page - Copal Electronics

Part # W-52TDI-GT
Description  CMOS White LED Driver
Download  11 Pages
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Manufacturer  COPAL [Copal Electronics]
Direct Link  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-52TDI-GT Datasheet(HTML) 6 Page - Copal Electronics

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W-52
6
Operation
The W-52 device is a high efficiency, constant
frequency, current regulating boost converter.
The device includes a switch and an internally
compensated loop for the regulation of the LED current.
Operation can be best understood by examining the block
diagram. The RSET pin is regulated at 100 mV and the
current through the external resistor will set the regulated
current in the LEDs (from 5 mA to 40 mA) with a
multiplication factor of 225.
While maintaining LED current regulation, the W-52
automatically adjusts the LED pin voltage to be as low as
possible. A low LED pin voltage ensures high efficiency.
Current through the internal power switch is continuously
monitored cycle by cycle. If the current limit is exceeded,
the switch is immediately turned off, protecting the device,
for the remainder of the cycle.
PWM dimming operation can be achieved by switching
the SHDN pin or by pulling the RSET pin higher than 0.1 V.
Block Diagram
Figure 14. W-52 Block Diagram
Current
Sense
Amp
W-52
PWM
& Logic
Current
Control
1.2 MHz
Oscillator
100 mV
GND
RSET
SW
LED
Over Voltage
Protection
(22 V)
225x
C1
6
3
4
2
1
5
VIN
VIN
SHDN
C2
D1
+
+
ILED = 225 x IS
L1
RSET
IS
ILED


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