BD9267KUT ROHM [Rohm], BD9267KUT Datasheet - Page 25

• Manufacturer Part Number: BD9267KUT
• Description: White LED Diver for Backlight of Medium/Large-sized LCDs
• Manufacturer: ROHM [Rohm]

BD9267KUT
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
・ ・ ・ ・ LED_SHORT protection
・ ・ ・ ・ LED_OPEN protection
◆ ◆ ◆ ◆ Condition for protections
When PWMx=HIGH, If Drain pin becomes 5V(typ) or more (LSP=OPEN), ERR_DET = LOW is outputted and LED SHORT
error will be detected.
When PWMx=HIGH, If Drain pin becomes 0.1V(typ) or lower, ERR_DET = LOW is outputted and LED OPEN error will be
detected.
① When PWMx=HIGH, LED OPEN error is detected. ERR_DET=LOW is outputted.
② When PWMx=LOW, LED OPEN error is not detected.
③ When PWMx=HIGH, LED OPEN error is detected. When PWMx=LOW, If drain pin voltage is release condition,
① When PWMx=HIGH, LED SHORT error is detected. ERR_DET=LOW is outputted.
② When PWMx=LOW, LED SHORT error is not detected.
③ When PWMx=HIGH, LED SHORT error is detected. When PWMx=LOW, even though the drain pin voltage is
RES SHORT
MOSSHORT
LEDSHORT
VCC UVLO
LED OPEN
Protection
If drain pin voltage is release condition, ERR_DET=HIGH is outputted.
ERR_DET output keep-hold.
If drain pin voltage is released, ERR_DET=HIGH is outputted.
realeased, ERR_DET output is kept.
name
Protection pin
(internal)
VCC
Dx
Dx
Sx
Sx
(internal)
Dx < 0.2V
Dx > 5V
(LSP=OPEN)
Sx < 0.15
Sx>0.15
VCC<7.3V
CHx:EN
PWMx=High
Figure 24. LED SHORT Protection
Figure 23. LED OPEN Protection
CHx=EN
PWMx=High
CHx=EN
PWMx=High
CHx=EN
PWMx=LOW
Condition
Detection
25/28
Release Condition
(LSP=OPEN)
Sx > 0.15V
Sx < 0.15V
VCC>7.5V
Dx > 0.1V
Dx < 5V
Abnormal detection
ERR_DET signal output
Abnormal detection
ERR_DET signal output
Abnormal detection
ERR_DET signal output
Abnormal detection
ERR_DET signal output
Abnormal detection
ERR_DET signal output
TSZ02201-0F1F0C100050-1-2
Protection Type
03.Aug.2012 Rev.001
Datasheet