Overview
The LED7707TR, produced by STMicroelectronics, is a high-efficiency monolithic boost converter designed specifically for supplying LED arrays used in the backlighting of LCD panels. This device integrates six controlled current generators (rows) and can manage an output voltage up to 36 V, which is sufficient for driving up to 10 white LEDs per row. The current generators can be externally programmed to sink up to 85 mA and can be dimmed via a PWM signal, allowing for precise control over the backlight intensity. The LED7707TR also includes features for detecting and managing open circuit and short-circuit LED faults, as well as basic protections such as output overvoltage, internal MOSFET overcurrent, and thermal shutdown.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Input Voltage Range | 4.5 V to 36 V | Operating input voltage range of the boost converter |
| Output Voltage | Up to 36 V | Maximum output voltage the device can manage |
| Switching Frequency | 250 kHz to 1 MHz | Adjustable switching frequency of the boost converter |
| Current per Row | Up to 85 mA | Maximum current each row can sink |
| Package Type | VFQFPN-24 4x4 mm | Package type and dimensions of the device |
| Operating Temperature | -40°C to 150°C | Range of temperatures within which the device can operate |
| Protection Features | Output overvoltage, internal MOSFET overcurrent, thermal shutdown | Built-in protection features of the device |
Key Features
- Boost Converter: Internal power MOSFET with a constant frequency peak current-mode control.
- Adjustable Switching Frequency: 250 kHz to 1 MHz, with external synchronization for multi-device applications.
- Pulse-Skip Power Saving Mode: Reduces power consumption at light loads.
- Programmable Soft-Start: Allows for controlled startup of the device.
- Programmable OVP Protection: Overvoltage protection can be programmed for added safety.
- LED Fault Detection: Detects and manages open circuit and short-circuit LED faults.
- PWM Dimming: Supports dimming via a PWM signal with a minimum dimming on-time of less than 10 µs.
- Thermal Shutdown: Protects the device from overheating.
Applications
- LCD Monitors and TV Panels: Ideal for backlighting in LCD displays.
- PDAs and GPS Panels: Suitable for backlighting in portable devices.
- Other LCD Panels: Can be used in various LCD panel backlighting applications where high efficiency and precise current control are required.
Q & A
- What is the input voltage range of the LED7707TR?
The input voltage range is from 4.5 V to 36 V.
- What is the maximum output voltage the LED7707TR can manage?
The device can manage an output voltage up to 36 V.
- How many rows of LEDs can the LED7707TR control, and what is the maximum current per row?
The device controls six rows, each capable of sinking up to 85 mA.
- What is the switching frequency range of the LED7707TR?
The switching frequency is adjustable from 250 kHz to 1 MHz.
- Does the LED7707TR support PWM dimming?
Yes, it supports PWM dimming with a minimum dimming on-time of less than 10 µs.
- What protection features are built into the LED7707TR?
The device includes output overvoltage, internal MOSFET overcurrent, and thermal shutdown protections.
- Can the LED7707TR detect LED faults?
Yes, it can detect and manage open circuit and short-circuit LED faults.
- What is the package type and dimensions of the LED7707TR?
The device comes in a VFQFPN-24 4x4 mm package.
- What is the operating temperature range of the LED7707TR?
The device operates within a temperature range of -40°C to 150°C.
- Is the LED7707TR RoHS compliant?
Yes, the LED7707TR is RoHS compliant.
