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SE3362 Datasheet(HTML) 4 Page - Seaward Electronics Inc.

Part No. SE3362
Description  4-Channel Regulated Charge Pump White LED Driver
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Maker  SEAWARD [Seaward Electronics Inc.]
Homepage  http://www.seawardinc.com
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SE3362 Datasheet(HTML) 4 Page - Seaward Electronics Inc.

   
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Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics, Inc., 2007. • www.seawardinc.com.cn • Page 4
Note 1: Exceeding the absolute maximum rating may damage the device.
Note 2: The device is not guaranteed to function outside its operating rating.
Note 3: Current Matching refers to the difference in current from on LED to the next.
ILED Current Matching = ±
%
100
)
(
)
(
)
(
)
(
×
+
MIN
LED
MAX
LED
MIN
LED
MAX
LED
I
I
I
I
Control Inputs
Output Status
CTRL1
CTRL0
LED4
LED3
LED2
LED1
0
0
OFF
OFF
ON
ON
0
1
OFF
ON
ON
ON
1
0
ON
ON
ON
ON
Table1
1
1
OFF
OFF
OFF
OFF
Operations
The SE3362 is a high efficiency charge pump white
LED driver. It provides 4 channels low drop-out voltage
current source to regulated 4 white LED’s current. For
high efficiency, the SE3362 implements x1/x2 mode
charge pump. An external RSET is used to set the
current of white LED.
Dimming Control
CTRL0 and CTRL1 are used to control the on/off of
White LED. When an external PWM signal is connected
to the control pin, brightness of white LED is adjusted by
the duty cycle. The SE3362 supports the dimming
control frequency up to 1KHz.
LED Current Setting
The current of white LED connected to SE3362 can be
set by RSET. The channel current that flows through the
white LED is 400 times greater than the current of RSET.
The white LED can be estimated by following equation:
ILED = 400×
⎟⎟
⎜⎜
SET
RSET
R
V
where VRSET = 1.25V, and RSET is the resistance
connected from RSET to GND.
Thermal Shutdown
The SE3362 provides a high current capability to drive 4
white LEDs. A thermal shutdown circuit is needed to
protect the chip from thermal damage. When the chip
reaches the shutdown temperature 150
°C, the thermal
shutdown circuit turns off the chip to prevent the thermal
accumulation in the chip.
Short Circuit Protection
The SE3362 provides short circuit protection function.
When output Voltage is shorted to GND, short circuit
protection cell shutdown ChargePump and current
source, and consequently the IC and the related LED’s
are protected.


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