BD6583MUV-A Ver la hoja de datos (PDF) - ROHM Semiconductor
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BD6583MUV-A
ROHM Semiconductor
BD6583MUV-A Datasheet PDF : 27 Pages
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BD6583MUV-A
Technical Note
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. RSTB input current
Parallel numbers used for current driver
RSTB input current
6
0.12mA
5
0.23mA
4
0.33mA
3
0.43mA
2
0.53mA
1
0.63mA
0
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 Fig.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 Fig.36 and this process of light off is recommended.
RS TB
PWMDRV
PWMPOW
Output Voltage
Current coil
Fig.35 Light off control of PWMPOW pin at PWM control on PWM=L
RS TB
PWMDRV
PWMPOW
Output Voltage
Current coil
Fig.36 Light off control of PWMPOW pin at PWM control on RSTB=L
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12/26
2011.06 - Rev.C
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