BD9397EFV 데이터 시트보기 (PDF) - ROHM Semiconductor

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BD9397EFV

White LED Driver for large LCD panel

ROHM Semiconductor 

BD9397EFV

Datasheet

●3.2 Protection Operation at FAIL Latch output (FAILMODE=L)

●3.2.1 List of the Threshold Function terminal（typ. condition）

Please decide the resistance divider of the various protection detection using the following table.

Protection

name

LED Open

LED short

Detection

Pin name

LEDx

LEDx

Detection

condition

LEDx < 0.2V

SS>3V

LEDx > 5×VLSP

SS>3V

PWM

High

High

Release

condition

LEDx > 0.2V

LEDx < 5×VLSP

PWM

High/Low

High/Low

Protection type

Stop the CH latch after the CP

charge is completed.

Stop the CH latch after the CP

charge is completed.

UVLO

UVLO

UVLO < 2.3V

―

UVLO > 2.5V

―

Stop the system

OVP

SCP

OVP

OVP

OVP > 2.43V

―

OVP < 2.4V

OVP < 0.2V

―

OVP > 0.2V

OCP

CS

CS > 0.45V

―

CS < 0.45V

It is possible to reset with the FAIL_RST terminal to release the latch stop.

―

Stop the N output

Stop the N output.

―

Stop the system after the CP

charge is completed.

―

Stop the N output under the

detection.（Pulse by Pulse）

●3.2.2 List of Protection function

Protection function

STB

LED Open

LED short

UVLO

DC/DC converter

Stop

Normal operation

(Stop when all LED

CH stop)

Normal operation

*1

Stop

Action when protection function is detected

LED driver

Soft-start

FAIL terminal

Stop

Stop after CP charge

(Latch operation)

Stop after CP charge

(Latch operation)

Stop

Discharge

Normal operation

Normal operation

Discharge

OPEN

DRAIN after the CP

charge is completed.

(Latch operation)

DRAIN after the CP

charge is completed.

(Latch operation)

GND

OVP

Stop N output

Normal operation

Normal operation

SCP

Stop N output

Stop after CP charge

(Latch operation)

Discharge after latch

OCP

Stop the N output

(Pulse by Pulse)

Normal operation

Normal operation

（*1）Short protection doesn't hang when becoming remainder 1ch. DCDC output falls as LED short.

OPEN

DRAIN after the CP

charge is completed.

(Latch operation)

OPEN

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TSZ22111・15・001

13/27

TSZ02201-0F1F0C100330-1-2

9.Jan.2014 Rev.001

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