Overview
The TPS92390RHBR, produced by Texas Instruments, is a high-efficiency LED driver designed for large screen display LED backlight applications. This device is particularly suited for automotive and industrial environments due to its robust features and wide operating range. It supports up to four high-precision current sinks, each capable of delivering up to 200 mA of DC current, with a current matching of 1% typical. The TPS92390RHBR offers advanced dimming capabilities, including 16-bit LED dimming resolution via I2C or PWM input, and a dimming ratio of 32,000:1 using a 152-Hz LED output PWM frequency.
Key Specifications
| Parameter | Specification |
|---|---|
| Input Voltage Range | 3 V to 48 V |
| Current Sinks | Four high-precision current sinks, up to 200 mA each |
| Current Matching | 1% (typical) |
| Dimming Ratio | 32,000:1 using 152-Hz LED output PWM frequency |
| Dimming Resolution | Up to 16-bit via I2C or PWM input |
| LED Strings Configuration | Up to 8 configurable LED strings |
| Switching Frequency | 100 kHz to 2.2 MHz |
| Boost Spread Spectrum | For reduced EMI |
| Boost Sync Input | To set boost switching frequency from an external clock |
| Output Voltage | Up to 48 V boost or SEPIC DC/DC controller |
| Package | QFN (32), 5 mm × 5 mm |
Key Features
- Auto-phase shift PWM dimming for reduced EMI and increased LED lifetime.
- 12-bit analog dimming and hybrid PWM dimming.
- Adaptive output voltage control to minimize power consumption.
- Extensive fault diagnostics, including open-string, shorted LED, and overcurrent/overvoltage protection.
- Device undervoltage protection (VDD UVLO) and input overvoltage protection (VIN OVP).
- Thermal shutdown for die overtemperature protection.
- Integrated regulated charge pump for gate drive of the external FET.
- I2C interface for brightness control and fault condition diagnosis.
Applications
- Backlight for monitors, TVs, and medical displays.
- Industrial backlighting systems in control panels.
- Industrial PCs and test and measurement equipment.
Q & A
- What is the input voltage range of the TPS92390RHBR?
The input voltage range is 3 V to 48 V.
- How many high-precision current sinks does the TPS92390RHBR support?
The device supports four high-precision current sinks.
- What is the maximum current per current sink?
Each current sink can deliver up to 200 mA of DC current.
- What is the dimming ratio of the TPS92390RHBR?
The dimming ratio is 32,000:1 using a 152-Hz LED output PWM frequency.
- How is the LED brightness controlled?
The LED brightness can be controlled globally through the I²C interface or PWM input.
- What is the switching frequency range of the boost regulator?
The switching frequency can be set between 100 kHz and 2.2 MHz.
- Does the TPS92390RHBR have built-in fault diagnostics?
- How is the boost voltage controlled?
The boost voltage is adapted automatically to the minimum necessary level needed to drive the LED strings by monitoring all the LED output voltages continuously.
- What is the purpose of the integrated charge pump?
The integrated regulated charge pump is used to supply the gate drive for the external FET of the boost controller.
- What are the common applications of the TPS92390RHBR?
