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SE3362 Datasheet(HTML) 6 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) 6 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 6
Table 3. The relation between control signal and
equivalent resister of RSET pin
S1
S2
S3
Equivalent Resister of RSET pin
( RSET )
0
0
0
RSET = R4
0
0
1
RSET = R3//R4
0
1
0
RSET = R2//R4
0
1
1
RSET = R2//R3//R4
1
0
0
RSET = R1//R4
1
0
1
RSET = R1//R3//R4
1
1
0
RSET = R1//R2//R4
1
1
1
RSET = R1//R2//R3//R4
LED Dimming Control Methods
The SE3362 can use two methods to achieve the LED
dimming control. These methods are detailed described
as following:
(1) Dimming using PWM signal into CTRL0 and CTRL1
LED current can be controlled by applying a PWM signal
to CTRL0 or CTRL1. Table 1 shows the relationship
between CTRLx and 4 LED's current states. For an
example, as the CTRL1 is pulled logical high and CTRL0
receives a PWM signal, then, four LED’s will be dimmed
synchronously. Here, the PWM signal setting the LED's
current ON/OFF can achieve the average LED's current
which in design. The application circuit is shown in Figure
3. Figure 4, and Figure 5 show 3WLEDs and 2WLEDs
PWM dimming application circuit, respectively. During
the time of PWM signal logical low, the current is a fixed
value and setting by RSET resistor. So the average LEDs
current can be approximated as Equation.
ILED(AVG) =
PWM
ON
LED
OFF
T
I
T
)
(
×
Where:
TPWM is the period of PWM dimming signal TOFF is the
time of PWM signal at low. ILED(ON) is LED on state
current.
Figure 3. The PWM dimming application circuit
for 4WLEDs
Figure 4. The PWM dimming application circuit
for 3WLEDs
Figure 5. The PWM dimming application circuit
for 2WLEDs
Additionally,
SE3362
has
100us
delay
time
between mode transfer. This delay time makes
different
dimming
frequency
corresponds
to
different maximum duty of CTRLX pin. Please note
that the maximum dimming frequency can not
exceed the maximum dimming frequency which is
internally set at 1KHz.


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