IW7032 Datasheet, PDF (1/31 Pages) Dialog Semiconductor – 32-Channel LED Driver for LCD Panel Backlighting

iW7032
32-Channel LED Driver for LCD Panel Backlighting
1.0  Features
●● Fully integrated power FET with minimum external
components
●● Proprietary digital power management and patented
adaptive switch mode LED driver
●● 32-channel output each at 56 V with 9 V to 28 V input
supply voltage range
●● Dynamic external Boost or Buck controller interface to
optimize system power efficiency
●● Serial Peripheral Interface (SPI) compatible for high
bandwidth PWM-based dynamic local dimming
●● Per channel current up to 120 mA average current,
with non-adaptive-switch peak current of 120 mA for
local dimming and 192 mA for scanning mode, and with
adaptive-switch peak current up to 60% higher.
●● LED failure (open and short-circuit) detection
●● LED brightness local dimming, scanning, and 3D game
mode controlled by SPI interface
●● PWM dimming range from 1% to 99.9% with 10-bit
resolution
●● Vsync synchronized PWM
●● PWM dimming frequency from 120Hz to 2.4 kHz in
NTSC; 100Hz to 2.4kHz in PAL; and 96Hz to 2.4kHz
in 3D game mode with 5-bit programmability in normal
mode.
●● Over-temperature protection
●● UVLO protection
●● Green & Pb-free (RoHS compliant) BOM
2.0  Description
The iW7032 is a high efficiency driver for LEDs. It is designed
for use with mid- to large size LCD panels that use arrays
of LEDs as a backlight source. It is able to communicate
with up to two external step-up or step-down PWM DC-DC
converters to drive up to 32 separate strings of multiple
series-connected LEDs.
The iW7032 features dynamic output voltage control, which
automatically chooses the lowest active LED source voltage
to regulate the feedback voltage of a step-up or step-down
converter. Through this function, the iW7032 is able to
dynamically adjust the output voltage of up to two external
step-up or step-down converters to optimize the system
power efficiency.
The iW7032 also provides 32 constant current sinks with
maximum ±2% current matching. The LED PWM dimming
can be adjusted dynamically through a high bandwidth SPI
interface, which provides users flexibility to control the light
intensity of LEDs. In addition, users can provide versatile
configurations of the iW7032 through SPI interface registers.
The iW7032 can maintain very high efficiency even with the
existence of LED channel total forward voltage mismatch,
with the proprietary digital power management and patent
pending adaptive switch mode LED current regulation
technology.
The iW7032 has multiple features to protect the LED
channels from fault conditions, and these protections are
LED PWM cycle-by-cycle based to ensure system reliability
and provide consistent operation.
iW7032 is available in a low-profile, space-saving thermally
enhanced 10mm x 10mm TQFP-EP package.
3.0  Applications
●● Edgelit Local Dimming for LED TV Backlit
●● Direct & Segment-Edge LED Backlit LCDTV
●● LCD Public Information Displays
Rev. 1.3
iW7032
Page 1