Overview
The TPS92380, including the TPS92380PWPR variant, is a highly integrated LED driver designed for medium-size LCD backlight applications. This device, produced by Texas Instruments, features a DC-DC converter that supports both boost and SEPIC modes. It includes an integrated 3.3-A switch FET and an internal LDO, enabling direct connection to a battery without the need for a pre-regulated supply. The TPS92380 offers 3 or 4 high-precision current sinks, depending on the model, which can be combined for higher current capability. The device is known for its high dimming ratio, extensive fault detection features, and adaptive output voltage control to minimize power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of LED Channels | 3 (TPS92380), 4 (TPS92381) | - |
| LED Current per Channel | 120 mA | mA |
| Input Voltage Range | 4.5 V to 40 V | V |
| Output Voltage | Up to 45 V | V |
| Switching Frequency | 300 kHz to 2.2 MHz | kHz |
| Dimming Ratio | 10,000:1 at 100 Hz | - |
| Current Matching | 1% (typical) | % |
| Package Type | HTSSOP (20 pins) | - |
| Body Size | 6.50 mm × 4.40 mm | mm |
| Junction-to-Ambient Thermal Resistance | 44.2 °C/W | °C/W |
Key Features
- Integrated boost and SEPIC converter for LED string power.
- High dimming ratio of 10,000:1 at 100 Hz.
- Current matching of 1% (typical).
- LED string current up to 120 mA per channel, with the option to combine outputs for higher current.
- Adaptive output voltage control based on LED forward voltages to minimize power consumption.
- Spread spectrum for lower EMI and external synchronization input.
- Extensive fault detection and protection features, including input voltage OVP, UVLO, OCP, boost block SW OVP, output OVP, LED open and short fault detection, and thermal shutdown.
- PWM dimming input with a frequency range from 100 Hz to 20 kHz.
Applications
- Industrial Backlight for medium-size panels.
- Consumer Backlight for medium-size panels.
- Industrial Illumination for LED panels.
Q & A
- What is the input voltage range of the TPS92380?
The input voltage range is from 4.5 V to 40 V.
- How many LED channels does the TPS92380 have?
The TPS92380 has 3 LED channels, while the TPS92381 has 4 LED channels.
- What is the maximum output voltage of the TPS92380?
The maximum output voltage is up to 45 V.
- What is the switching frequency range of the TPS92380?
The switching frequency range is from 300 kHz to 2.2 MHz.
- What is the dimming ratio of the TPS92380 at 100 Hz?
The dimming ratio is 10,000:1 at 100 Hz.
- How is the output voltage controlled in the TPS92380?
The output voltage is controlled adaptively based on the LED forward voltages to minimize power consumption.
- What fault detection features does the TPS92380 have?
The device includes input voltage OVP, UVLO, OCP, boost block SW OVP, output OVP, LED open and short fault detection, and thermal shutdown.
- How is brightness controlled in the TPS92380?
Brightness is controlled using the PWM input, with a frequency range from 100 Hz to 20 kHz.
- What is the package type and size of the TPS92380?
The package type is HTSSOP (20 pins), and the body size is 6.50 mm × 4.40 mm.
- What is the junction-to-ambient thermal resistance of the TPS92380?
The junction-to-ambient thermal resistance is 44.2 °C/W.
