Overview
The LED7708TR, produced by STMicroelectronics, is a highly integrated 16-channel LED driver designed to supply several LEDs from a single low-voltage rail. It incorporates a boost controller, sixteen current generators, and a 4-wire serial interface. The boost controller regulates the output voltage adaptively to meet the LED requirements, enhancing overall efficiency. Each current generator is 40 V-rated, enabling the device to drive multiple LEDs in series on each channel, with the option to parallel channels for higher output current. The device also features a programmable on-chip dimming oscillator and supports master/slave chain configurations for noise reduction in multi-device applications. Basic protection mechanisms, including overvoltage, overcurrent, and thermal shutdown, as well as LED array protection, are also implemented.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 3.6 V to 36 V |
| Output Voltage Regulation | Adaptive output voltage for high efficiency |
| Switching Frequency | 250 kHz to 1 MHz |
| Number of Channels | 16 channels |
| Channel Current Capability | 85 mA per channel |
| Channel Current Accuracy | ±2% |
| Channel-to-Channel Current Matching | ±2% |
| Serial Interface | 4-wire, 30 MHz |
| Operating Temperature Range | -40°C to +150°C |
| Package Type | VFQFPN 48 7x7x1.0 mm |
Key Features
- Boost controller section with adaptive output voltage for high efficiency
- Internal +5 V and +3.3 V LDOs for gate driver and device supply
- High performance external MOSFET driver
- Programmable overvoltage and overcurrent protection
- Fixed frequency peak current-mode control
- External synchronization for multi-device applications
- Overtemperature alert and thermal shutdown
- LED array driver section with 16 channels, each capable of 85 mA
- LED short-circuit and open channel fault detection and management
- Selectable 12-bit or 16-bit grayscale brightness control for local dimming
- Programmable internal dimming oscillator and grayscale latency
- Master/slave chain configuration supported
Applications
- TV and monitor backlight units for LCD panels
- Medium and large size LCD panel backlights
- RGB/RGGB backlight solutions
Q & A
- What is the input voltage range of the LED7708TR?
The input voltage range is 3.6 V to 36 V.
- How many channels does the LED7708TR have, and what is the current capability per channel?
The LED7708TR has 16 channels, each capable of 85 mA.
- What is the switching frequency range of the boost controller?
The switching frequency range is 250 kHz to 1 MHz.
- Does the LED7708TR support external synchronization for multi-device applications?
- What types of fault detection and management does the LED7708TR offer?
- What is the operating temperature range of the LED7708TR?
- What package type is the LED7708TR available in?
- Does the LED7708TR support grayscale brightness control?
- Can the channels of the LED7708TR be configured in parallel for higher output current?
- What kind of serial interface does the LED7708TR use?
- Does the LED7708TR have built-in protection mechanisms?
