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PDF CXA3834AM Data sheet ( Hoja de datos )
| Número de pieza | CXA3834AM | |
| Descripción | LED Backlight Driver IC | |
| Fabricantes | Sony | |
| Logotipo |  |
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LED Backlight Driver IC
CXA3834AM
Description
The CXA3834AM is an LED driver IC with boost DC-DC converter. It enables luminance control using the peak
current and PWM signal, and blinking control using the BLINK signal. This IC has an optimum configuration for
realizing a simple and compact power supply circuit for an LCD TV equipped with a LED backlight.
(Applications: Power supply circuit, etc.)
Features
Shared
UVLO function
Overheat protection function
Error detection output function (xBL_ERR)
Detection timer latch function when abnormalities occur
LED driver control block
On-chip LED lighting FET gate driver
Luminance adjustment function using peak current control
Luminance adjustment function using the PWM signal
Blinking control using the BLINK signal
LED overcurrent detection function
DC-DC converter control block
On-chip boost type DC-DC converter
Output overvoltage detection function
Continuous overcurrent detection function
Slope compensation function
Structure
BiCMOS silicon monolithic IC
Package
16P-SOP
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license
by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating
the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
-1-
E11711C22
Free Datasheet http://www.datasheet4u.com/
1 page  
CXA3834AM
Pin Description
Pin
No.
Symbol
I/O
Typical pin
voltage
1 DRV
O VCC to GND
Equivalent circuit
Description
VCC
Pch
Pch
MOSFET driver output for
DRV boost converter
1 (Connect to the boost
Nch Nch converter NMOS gate.)
GND
VREF
Pch Pch
Current detection input for
2 ISENSE
I/O 1.0 V to GND
ISENSE
2
boost converter
(Connect to a slope
Pch compensation resistor.)
GND
3 OCP
VREF
Pch Overcurrent detection input
I 1.0 V to GND
OCP
3
for boost converter
(Connect to a current
Pch detection resistor.)
GND
VCC
4 EN
I VCC to GND
EN
4
Enable signal input
Pch
GND
5 xBL_ERR I/O VCC to GND
xBL_ERR
5
Nch
VCC
Pch Error signal output
(Connect to a pull-up
resistor.)
Nch
GND
-5-
Free Datasheet http://www.datasheet4u.com/
5 Page 
CXA3834AM
Detailed Description of Blocks
Start-up/Stop
CXA3834AM operation starts when voltage of 9.5 V (typ.) or more is applied to the VCC pin. When this voltage
is applied to the VCC pin, the internally generated reference voltage (VREF pin) is generated and the reset state
(POR) is canceled.
In addition, VCC has a built-in UVLO function, and when the VCC pin voltage falls to 9.0 V (typ.) or less, the IC
enters the reset state, the DC-DC converter stops operation and the DIM_SW output goes to Low output
regardless of the input signals of other pins.
When the VCC pin voltage rises to 9.5 V or more again, the reset is canceled and stopped functions can be
operated.
9.5 V
VCC
12 V
9.0 V
POR
(internal signal)
RESET
RESET release
Fig. 1. Start-up and Stop Operation After Power-on
RESET
Enable (EN)
DC-DC converter and LED driver operations are enabled by setting the EN pin to 2.0 V or more.
In addition, the PWM_DIM pin and the BLINK pin must both be High for the DC-DC converter to start operation.
When the EN pin falls to 1.0 V or less, the DC-DC converter stops operating instantly, but the signal input to
the PWM_DIM pin is output on the DIM_SW pin. In addition, when the EN pin is Low, the signal input to the
PWM_DIM pin is output as is on the DIM_SW pin even when the BLINK pin is Low.
EN
PWM_DIM
BLINK
2.0 V
1.0 V
DIM_SW
DRV
(DC-DC converter operation)
Fig. 2. Operation During Voltage Input to the EN Pin
- 11 -
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet CXA3834AM.PDF ] | |
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