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BD6142AMUV
Datasheet
● PWM dimming
Current driver PWM control is controlled by providing PWM signal to PWM port, as it is show in Figure 29. The current set
up with ISET is chosen as the H section of PWM and the current is off as the L section. Therefore, the average LED current
is increasing in proportion to duty cycle of PWM signal. This method that it lets internal circuit and DC/DC to work, because
it becomes to switch the driver, the current tolerance is a few when the PWM brightness is adjusted, it makes it possible to
brightness control until 5μs (Min 0.1% at 200Hz). And, don't use for the brightness control, because effect of ISET
changeover is big under 1μs ON time and under 1μs OFF time. Typical PWM frequency is 100Hz to 25kHz.
PWM
PWM
LED current
ON
ON
OFF
OFF
VOUT
Coil current
ON
OFF
LED
current
400ns/div
10mA/div
IC’s active current
ON
PWM
Figure 29. PWM sequence
Conditions ：
8serial 6parallel, LED current=20mA/ch,
VOUT
VIN=7V, Ta=25 ℃ , Output capacitor=2.2 μ F(50V/B3)
● Analog dimming
BD6142AMUV control LED current according analog input (ABC terminal).
For ABC voltage = typ 0.733V, LED current can set up Normal current
LED
current
40ns/div
10mA/div
by resistance value (RISET) connecting to ISET voltage.
To decrease ABC voltage, LED current decrease, and to increase
ABC voltage, LED current increase.
DC Input
ABC
1.2V
120.9k ?
0.733V
+
ISET
Resistor driver
Please set max LED current to check LED current setting range of P.17
Please care that ABC voltage of max LED current is 0.733V
ABC input range is 0.05V to 0.9V(Target).
This dimming is effected by ISET tolerance as follows.
When you don’t use analog dimming, please set condenser to ABC
180k Ω
-
ISET
36k ?
terminal. Until the condenser of ABC terminal is finished to charge,
LED current increase with that speed.
Figure 30. Analog dimming application
The resister between 1.2V and ABC terminal is 120.9k ? .
Please select the capacitor to care charge time.
ABC
1.2V
120.9k ?
0.733V
+
ISET
Resistor driver
180k ?
-
ISET
36k ?
Figure 31. PWM dimming application
ILED
[mA]
20mA
0.733V
0.9V
ABC[V]
Figure 32. ILED vs ABC voltage
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
18/30
TSZ02201-0G3G0C400340-1-2
03.Dec.2012 Rev.001
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