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BD6583MUV-A
Datasheet
In addition, the selection number of parallel number of the current driver is changed, the power-supply current of RSTB will
be increased. Because the maximum value of the consumption current at the RSTB=2.1V is indicated in the following Table
1, be careful enough when you calculate the restriction resistance.
Table1. The use parallel number of current driver at RSTB=2.1V , 100 ℃ vs. RS TB input current
Parallel numbers used for current driver RSTB input current
6 0.12mA
5 0.23mA
4
3
2
1
0
0.33mA
0.43mA
0.53mA
0.63mA
0.74mA
● Start to use PWMPOW terminal for the PWM control, PWM operating
After RSTB and PWMDRV is changing L ? H, input PWM to PWMPOW terminal.
There is no constraint in turn of RSTB and PWMDRV.
And, because it corresponds to PWM drive of shorter ON time than soft start time (1ms), when PWMPOW is input H more
than three times, the soft start is invalidated and it enable to correspond the high-speed drive. Until RSTB is set L,
invalidation of the soft start isn't canceled.
In case of lighting ? light off ? lighting, when it turns off the lights with PWM=L and It starts without soft start 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 37. 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 38 and this process of light off is recommended.
RSTB
PWMDRV
PWMPOW
Output Voltage
Current coil
Figure 37. Light off control of PWMPOW pin at PWM control on PWM=L
RSTB
PWMDRV
PWMPOW
Output Voltage
Current coil
Figure 38. Light off control of PWMPOW pin at PWM control on RSTB=L
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
17/32
TSZ02201-0G3G0C400180-1-2
03.Dec.2012 Rev.001
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