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PDF BD9271KUT Data sheet ( Hoja de datos )
| Número de pieza | BD9271KUT | |
| Descripción | White LED Diver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
LED Drivers for LCD Backlights
White LED Diver for
Backlight of Medium/Large-sized LCDs
BD9271KUT
General Description
BD9271KUT is a white LED diver used on backlight of
Medium/Large-sized LCDs. This IC can achieve
dimming function by SPI control. And through the SPI
correspondence, it can set the ON/OFF of each switch,
analog dimming and etc. The signals of PWM dimming
can set the frequency, ON time and delay of PWM by
inputting the external signals to the register.
BD9271KUT has equipped several protection functions
to deal with the abnormal states, including LED OPEN
protection, LED SHORT protection, external current
setting resistance SHORT protection, external MOS
transistor SHORT protection, etc. So it can be used in a
wide output voltage range and various load conditions.
Key Specifications
■ VCC power supply range：
■ DVDD power supply range：
■ CLK frequency setting range：
■ Operating Circuit current range：
■ Operating temperature range：
9.0V～35.0V
3.0V～3.6V
100～10000kHz
2.4mA(typ.)
-40℃～+85℃
Applications
TV, PC display
Other LCD backlight
Typical Application Circuit
Features
■ 16-ch constant current driver (external FET(NMOS）is
equipped.)
■ LED voltage can be set externally.
■ PWM dimming and Analogue dimming can be
controlled by SPI.
■ LED Abnormal operation detection circuit (OPEN
protection/ SHORT protection) is equipped.
■ LED SHORT protection detection voltage is adjustable
(LSP terminal)
■ LED SHORT protection detection CH
■ FAIL INDICATION function is equipped by ERR_DET
terminal.
■ 3 lines serial interface
■ Package: TQFP64U
Package
TQFP64U
Pin Pitch
W(Typ.) D(Typ.) H(Max.)
9.00mm×9.00mm×1.20mm
0.4mm
Figure 1. TQFP64U
Figure 2. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/34
TSZ02201-0F1F0C100260-1-2
22.Jul.2015 Rev.006
1 page  
BD9271KUT
Internal Equivalent Circuit Diagram
G1～G16
VREF5V
COMP1, COMP2
Datasheet
D1～D16
LSP
VREF5V
2MΩ
LSP
500kΩ
GND
CS, CLK, DI
DVDD
DVDD
CS,CLK,DI
10kΩ
S1～S16
S1～S16
VREF5V
10kΩ
GND GND
GND
STB
STB
500k
1M
GND GND
GND
GND
DO
DVDD
DVDD
DO
50Ω
VSYNC, HSYNC
DGND
DGND
ERR_DET
DGND
GND
Figure 5. Pin ESD Type
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/34
TSZ02201-0F1F0C100260-1-2
22.Jul.2015 Rev.006
5 Page 
BD9271KUT
Functions of Logic Block
Serial interface block
This IC is controlled with the CS, CLK, DI, and DO serial interfaces.
The following section describes data input format and timing.
Datasheet
◆WRITE MODE
・To write 1 byte of data:
CS
CLK
DI
tCSS
tCYC
tCLKH
tCSH
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
tDIS tDIH
tCLKL
A6 A5 A4 A3 A2 A1 A0 W D7 D6 D5 D4 D3 D2 D1 D0
Low
DO
Figure 14. WRITE MODE (for 1byte)
・Write consecutive 32 bytes of data:
CS
CLK
DI
DO
①
②
③
④
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
A 6 A 5 A 4 A 3 A 2 A 1 A 0 W D255 D254 D253 D252 D251 D250 D249 D248
Low
17 18 19 20 21 22 23 24
257 258 259 260 261 262 263 264
D247 D246 D245 D244 D243 D242 D241 D240
D7 D6 D5 D4 D3 D2 D1 D0
Low
Figure 15. WRITE MODE (for 32byte)
①
②
③
④
Addresses are automatically counted up in increments of 1 address by 8 bits after the first set value.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/34
TSZ02201-0F1F0C100260-1-2
22.Jul.2015 Rev.006
11 Page | ||
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| PDF Descargar | [ Datasheet BD9271KUT.PDF ] | |
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