HY84128

HY84128

Application

Control Panel Illumination
Local Dimming LED Backlight Drivers

DESCRIPTION

      The HY84128 is a 128 channel matrix LED driver with independent channel control, designed for driving locally dimmed displays. The device supports 4 low-resistance high-side switches and 32 low-side current sinks that can deliver up to 40mA of continuous current per channel. The driver has 13-bit PWM duty cycle and 11-bit current control of each low-side LED current sink. An extra global 12-bit current control for all of channels provides a simple dimming control method.

      Each current sink can be individually controlled through the SPI interface, but also has the capability to be controlled with a single value over the global brightness control register.

Programmable MUX phase shift and MUX gap offer a largest flexibility to synchronize LCD display frame.

      A digital enhanced DC/DC feedback function is regulating any external SMPS to the best suitable output voltage needs of the LED strings to minimize power dissipation.

Full protections are included, including build-in LED open/short detection for each channel and device thermal shutdown.

FEATURES

Supply Voltage

 VDD 9~16V

Dynamic LED Dimming Control and Hybrid Dimming Control Scheme

32 High-Precision Current Sinks

40mA max. current per channel,

Adjustable range from 2.5mA to peak current

Independent 13-bit PWM duty cycle and 11-bit DC dimming control

Min. on time 500ns with 2-bit slew rate control

Support 12-bit Global DC Dimming

Build in Scan Line Driven

MUX=4

Embedded high-side PMOS (Ron=0.14ohm, typ.)

Programmable MUX Phase Shift and MUX Gap

Max. delay 1 frame, 13-Bit resolution

Gap selection 32/64/128/256 CLK

Support 8x MUX Refresh Rate

Support Voltage Mode Feedback with 8-Bit Resolution

46Hz ~ 0.5KHz VSYNC, No HSYNC, Build-in PLL

SPI Interface

Max Speed 16MHz

Daisy chain and parallel structure capable

Protection:

LED Open Detection by each zone

LED Short Detection by each zone

Thermal shutdown

Fault event will be indicated by INTB pin (open-drain)

WQFN-64L 7.0mm*7.0mm*0.75mm package

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ORDERING INFORMATION

Part NumberPackage

HY84128

WQFN 7x7 -64L

TYPICAL APPLICATION DIAGRAM
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