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BD9267KUT

White LED Diver for Backlight of Medium/Large-sized LCDs

ROHM Semiconductor 

BD9267KUT

Datasheet

●Pin Function Descriptions

G1-G16 （1,4,7,10,13,16,19,22,27,30,33,36,39,42,45,48PIN）

External FET gate driving terminal of LED constant current driver, operating range : 0～5V.

S1-S16 （3,6,9,12,15,18,21,24,25,28,31,34,37,40,43,46PIN）

Connect to external FET’s source terminal of LED constant current driver。Through the operations of constant current

driver, all CHs of S1-S16 terminals are outputted the set voltages at addresses of 02h, 03h, and S1-S16 proceed the

constant current operation.

By monitoring the voltage of this terminal, the external resistance SHORT detection of each CH and external MOS

SHORT during Drain-Source detection proceed.

When Dimming＝HIGH, external resistance SHORT detection proceeds, and output the errors.

When Dimming＝LOW, external MOS Drain-Source SHORT detection proceeds, and output the errors.

D1-D16 （2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47PIN）

At output terminal of LED constant current driver, drain of external FET is connected. By monitoring the voltage of this

terminal, LED OPEN detection and LED SHORT detection of each terminal proceed.

When Dimming＝HIGH, if LED is in SHORT mode or OPEN mode, error signals are outputted.

LED OPEN protection detected voltage ・・・0.1V(typ.)

LED SHORT protection detected voltage・・・5.0V(typ.)・・・(It can be changed by setting the LSP terminal. Details are

given in LSP Pin Description.)

When Dimming ＝ LOW, the abnormal state when Dimming ＝ HIGH just before continues. In other words, when

Dimming=HIGH and the abnormal state is detected, the error signal is still outputted even turned to Dimming＝LOW.

To prevent the mistake of detection caused by the time change of state, abnormal detection mask can be set at address

of 04h.

At D1～16 pin

① LED OPEN detection（when PWM=H）

② LED SHORT detection（when PWM=H）

At S1～16 pin

③ RESISTOR SHORT detection（when PWM=H）

④ MOS SHORT detection（when PWM=L）

are detected, then the error signals are outputted.

Figure 10. LED Protected operation

VREF5V （49PIN）

The VREF5V pin is used to output power (5V) to the internal block of the IC and serves as a main power supply for the

internal circuit of the IC. Install a ceramic capacitor as close to this pin as possible in order to stabilize the power supply

voltage.

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© 2012 ROHM Co., Ltd. All rights reserved.

TSZ22111・15・001

8/28

TSZ02201-0F1F0C100050-1-2

03.Aug.2012 Rev.001

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