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BD6581GU
Datasheet
● Start to Use PWMDRV Terminal for the PWM Control, PWM Operating
After RSTB and PWMPOW is changing L → H, input PWM to PWMDRV terminal.
There is no constraint in turn of RSTB and PWMPOW.
After RSTB and PWMPOW is changing L → H as follows Figure 34, when it is not input PWM to PWMDRV pin but input L,
boost of DC/DC is unstable state because current driver doesn’t pass current.
The starting current is pulled from each LED terminal and pressure up operating is stabilized to escape from this state.
Also, the starting current can be set up by the resistance value connected to the ISETL terminal.
After starting, as the starting current in PWM brightness control become useless, the starting current is set up 0mA at the
second rise time of PWMDRV automatically as follows Figure 34.
In case of lighting → light off → lighting, when it turns off the lights with PWM=L and It starts without soft start because of
soft start period was end when it sets PWM modulated light again.
But the peak current of the coil changes owing to discharge of output capacitor, It may flow to the over current limit value,
as follows Figure 35. Because soft start can be used when it turns off the lights with RSTB=L, The peak current of the coil
can be suppressed, as follows Figure 36 and this process of light off is recommended.
RSTB
PWMPOW
L
H
L
H
L
H
L
PWMDRV
Output voltage
LED pin
ON
OFF
ON
O F F
Current driver of
starting current
Figure 34. Off timing of starting current at PWMDRV=L
RSTB
PWMPOW
PWMDRV
Output Voltage
Current coil
Figure 35. Light off control of PWMDRV pin at PWM control on PWM=L
RSTB
PWMPOW
PWMDRV
Output voltage
Coil current
Figure 36. Light off control of PWMDRV pin at PWM control on RSTB=L
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
17/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
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