Overview
The LED7706TR, produced by STMicroelectronics, is a high-efficiency monolithic boost converter specifically designed for the backlighting of LCD panels. This device integrates six controlled current generators, each capable of managing up to 30 mA of current. It is optimized for driving LED arrays and features a wide input voltage range of 4.5 V to 36 V, with an output voltage capability of up to 36 V, allowing for the management of up to 10 white LEDs per row.
The LED7706TR includes various protection mechanisms such as output over-voltage protection, internal MOSFET over-current protection, and thermal shutdown. It also supports external programming for soft-start, over-voltage protection, and fault management for open and short-circuited LEDs.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | - | 36 | V |
| Output Voltage | - | - | 36 | V |
| LDO Output Voltage | 4.4 | 5 | 5.5 | V |
| Switching Frequency | 250 kHz | - | 1 MHz | - |
| Maximum Current per Row | - | - | 30 mA | - |
| Internal MOSFET On-Resistance | 280 | - | 500 | mΩ |
| Thermal Resistance Junction to Ambient | - | - | 42 | °C/W |
| Junction Operating Temperature Range | -40 | - | 150 | °C |
Key Features
- Boost Section:
- 4.5 V to 36 V input voltage range
- Internal power MOSFET
- Internal +5 V LDO for device supply
- Up to 36 V output voltage
- Constant frequency peak current-mode control
- 250 kHz to 1 MHz adjustable switching frequency
- External synchronization for multi-device application
- Pulse-skip power saving mode at light load
- Programmable soft-start
- Programmable OVP protection
- Stable with ceramic output capacitors
- Thermal shutdown
- Backlight Driver Section:
- Six rows with 30 mA maximum current capability (adjustable)
- Rows disable option
- Less than 500 ns minimum dimming on-time (1 % minimum dimming duty-cycle at 20 kHz)
- ±2 % current matching between rows
- LED failure (open and short-circuit) detection
Applications
- LCD monitors and TV panels
- PDA panel backlight
- GPS panel backlight
- Industrial applications requiring high-efficiency LED backlighting
Q & A
- What is the input voltage range of the LED7706TR?
The input voltage range is from 4.5 V to 36 V.
- What is the maximum output voltage of the LED7706TR?
The maximum output voltage is up to 36 V.
- How many rows of LEDs can the LED7706TR manage?
The device can manage six rows of LEDs.
- What is the maximum current per row that the LED7706TR can handle?
The maximum current per row is 30 mA.
- Does the LED7706TR support PWM dimming?
- What protection mechanisms are included in the LED7706TR?
The device includes output over-voltage protection, internal MOSFET over-current protection, and thermal shutdown.
- Can the LED7706TR detect LED faults?
- What is the switching frequency range of the LED7706TR?
The switching frequency is adjustable from 250 kHz to 1 MHz.
- Does the LED7706TR support external synchronization?
- What is the thermal resistance junction to ambient of the LED7706TR?
The thermal resistance junction to ambient is 42 °C/W.
