Datasheet

Datasheet

12/34

TSZ02201-0F1F0C100240-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

15.Feb.2016 Rev.006

www.rohm.com

TSZ22111・15・001

BD9486F

●2.6 Detection Condition List of the Protect Functions (TYP Condition)

Protect Function

Detection

Pin

Detect Condition

Release

Condition

Timer

Operation

Protection Type

Detection

Condition

PWM

SS

FBMAX

FB

FB > 4.0V

H(4clk)

SS>3.7V

FB < 4.0V

CP charge

Latch off

LED OCP

ISENSE

ISENSE > 3.0V

-

-

ISENSE < 3.0V

4clk

Latch off

RT GND SHORT

RT

RT<VRT×90%

-

-

Release

RT=GND

NO

Restart by release

UVLO

UVLO

UVLO<2.7V

-

-

UVLO>3.0V

NO

Restart by release

REG50UVLO

REG50

REG50<2.3V

-

-

REG50>2.6V

NO

Restart by release

VCC UVLO

VCC

VCC<7.2V

-

-

VCC>7.5V

NO

Restart by release

OVP

OVP

OVP>3.0V

-

-

OVP<2.8V

4clk

Latch off

OCP

CS

CS>0.4V

-

-

-

NO

Pulse by Pulse

OCP LATCH

CS

CS>1.0V

-

-

CS<1.0V

4clk

Latch off

To reset the latch type protection, please set STB logic to ‘L’ once. Otherwise the detection of VCCUVLO, REG50UVLO is

required.

The clock number of timer operation corresponds to the boost pulse clock.

●2.7 Behavior List of the Protect Function

Protect Function

Operation of the Protect Function

DC/DC Gate

Output

Dimming Transistor

(DIMOUT) Logic

SS Pin

RT pin

(FAILB logic)

FBMAX

Stops after latch

L after latch

discharge after latch

L after latch

LED OCP

Stops immediately

H immediately, L after latch

discharge after latch

L after latch

RT GND SHORT

Stops immediately

immediately L

Not discharge

-

STB

Stops immediately

L after REG50UVLO

detects

discharge immediately

L after REG50UVLO

detects

UVLO

Stops immediately

immediately L

discharge immediately

H (2.0V)

REG50UVLO

Stops immediately

immediately L

discharge immediately

H (2.0V)

VCC UVLO

Stops immediately

immediately L

discharge immediately

H (2.0V)

OVP

Stops immediately

immediately L

discharge after latch

L after latch

OCP

Stops immediately

Normal operation

Not discharge

H (2.0V)

OCP LATCH

Stops after latch

L after latch

discharge after latch

L after latch

Please refer to section “3.5 Timing Chart” for details.