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.
l Supply Voltage
- VDD 9~16V
l Dynamic LED Dimming Control and Hybrid Dimming Control Scheme
l 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
l Support 12-bit Global DC Dimming
l Build in Scan Line Driven
- MUX=4
- Embedded high-side PMOS (Ron=0.14ohm, typ.)
l Programmable MUX Phase Shift and MUX Gap
- Max. delay 1 frame, 13-Bit resolution
- Gap selection 32/64/128/256 CLK
l Support 8x MUX Refresh Rate
l Support Voltage Mode Feedback with 8-Bit Resolution
l 46Hz ~ 0.5KHz VSYNC, No HSYNC, Build-in PLL
l SPI Interface
- Max Speed 16MHz
- Daisy chain and parallel structure capable
l 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)
l WQFN-64L 7.0mm*7.0mm*0.75mm package
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ORDERING INFORMATION
| Part Number | Package |
|---|---|
HY84128 | WQFN 7x7 -64L |
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