Overview
Description
The AS3812 LED driver for LCD backlighting integrates 16 highly accurate current sinks with digital control technology to improve brightness control for 4K and HDR LCD displays. Absolute current accuracy of better than ±1% combined with high resolution dimming control allows for the highest brightness uniformity across the panel.
The AS3812 offers 12-bit individual dimming control. This feature reduces power consumption and increases the contrast ratio through optimized local dimming. A single, 10-bit global dimming control also provides uniform brightness control over the full panel.
Enhanced DC/DC feedback control for up to two external DC/DC converters controlled by an SPI bus and a full array of protection features makes the AS3812 flexible and fully protected for any LCD display system.
Features
- 16-channel LED driver with internal current sink MOSFET
- Integrated current setting resistors for lower BOM cost
- 30V maximum output voltage per channel
- Highly accurate absolute current accuracy of ±1%
- Individual 12-bit PWM for each output and one 10-bit global analog dimming control
- Improves contrast ratio and saves power via local dimming
- Comprehensive protection features:
- Individual LED short protection
- External reset input – Holds outputs off until the system is ready
- Register Lock/Unlock
- LED open-fault detection
- Over-temperature protection
- SPI daisy-chain interface simplifies design when supporting more than 16 LED strings
- 3 SPI communication protection modes in one LED driver
- Internal PLL ensures jitter-free operation even with a noisy VSYNC signal
Comparison
Applications
- LCD backlighting for Ultra HD/4K HDR TVs
- HDR notebooks/monitor displays
Documentation
Featured Documentation
Log in required to subscribe
|
|
|
|
|---|---|---|
| Type | Title | Date |
| Datasheet - Short-form | PDF 306 KB | |
1 item
|
||
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| 32 QFN | Tape & Reel | 3 | Get Samples, |
Tips for Using This Parametric Table:
- Hide Filters button in header: Collapse or expands filters
- Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
- Reset button in header: Reset all filters to the page default
- Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
- Export button in header: Export the filtered results of the table to an Excel document
- Filter parts search bar in header: Type to filter table results by part number
- Hide column button in column headers: Select to hide columns in table
- AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
- Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
- Document icon next to product name in row: View the featured document for this product
- Chip icon next to the right of the document icon in row: View the block diagram for this product
- Cart icon to the right of the chip icon: Indicates that samples are available for this product