BD8119FM-M
● Protection Sequence
VCC
* 1
EN
Technical Note
VREG
UVLO
VDAC
SYNC
* 1
* 2
4.5V
PWM
* 2
SS
ILED1
ILED2
ILED3
ILED4
VLED1
VLED2
1.0 V
<0.3 V
VLED3
VLED4
>4.7 V
100ms * 3
100ms * 3
0.3V
2.0V
1.7V
VOVP
FAIL1
FAIL2
* 4
* 1
* 2
* 3
Turn on the EN after the VCC is on
SYNC and PWM inputs are allowed to be on beforethe VCC is on
Aprox 100ms of delay when Fosc = 300kHz
Case for LED2 in open-mode
When VLED2 < 0.3V and VOVP > 1.7V simultaneously, then LED2 becomes off and FAIL2 becomes low
Case for LED3 in short-mode
When VLED3 > 4.7V and VOVP < 1.6V simultaneously, then LED3 becomes off after 100ms approx
Case for LED4 in short to GND
③ -1 DCDC output voltage increases, and then SS dichages and FAIL1 becomes low
③ -2 Detects VLED4<0.3V and shuts down after 100ms approx
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? 2011 ROHM Co., Ltd. All rights reserved.
10/20
2011.08 - Rev.B
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