Overview
The TPS61197DR from Texas Instruments is a highly integrated single-string white-LED driver designed specifically for LCD TV backlighting. This device operates as a current-mode boost controller, driving one WLED string with multiple LEDs in series. It optimizes efficiency by adjusting the output voltage to the minimum required by the LED string, thereby minimizing power loss. The TPS61197DR supports high-precision PWM dimming and includes various protection features to ensure reliable operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 8 to 30 | V |
| Switching Frequency Range | 50 kHz to 800 kHz | kHz |
| PWM Dimming Frequency Range | 90 Hz to 22 kHz | Hz |
| PWM Dimming Resolution | Up to 5000:1 | - |
| Output Overvoltage Protection Threshold | Programmable | V |
| Input Undervoltage Lockout Threshold | Programmable, default 6.5 V | V |
| Package Type | 16-pin SOIC | - |
| Package Size | 17.90 mm × 7.50 mm | mm |
Key Features
- High-precision PWM dimming resolution up to 5000:1
- Programmable switching frequency from 50 kHz to 800 kHz
- Adaptive boost output to white-LED voltage
- Programmable overvoltage protection threshold at output
- Programmable undervoltage threshold at input with adjustable hysteresis
- Adjustable soft-start time independent of dimming duty cycle
- Built-in LED open and IFB short protections
- Built-in Schottky diode open/short protection
- Thermal shutdown and overcurrent protection
Applications
- LCD TV backlighting
- Large LCD TV displays
- Monitors
Q & A
- What is the input voltage range of the TPS61197DR?
The input voltage range is from 8 V to 30 V.
- What is the switching frequency range of the TPS61197DR?
The switching frequency can be programmed from 50 kHz to 800 kHz.
- What is the PWM dimming frequency range of the TPS61197DR?
The PWM dimming frequency ranges from 90 Hz to 22 kHz.
- What is the PWM dimming resolution of the TPS61197DR?
The PWM dimming resolution is up to 5000:1.
- Does the TPS61197DR have built-in protection features?
Yes, it includes LED open protection, IFB short protection, Schottky diode open/short protection, overcurrent protection, and thermal shutdown.
- How is the switching frequency programmed on the TPS61197DR?
The switching frequency is programmed using an external resistor (R7) connected to the device.
- What is the purpose of the soft-start feature in the TPS61197DR?
The soft-start feature avoids inrush current during start-up by gradually ramping up the output voltage.
- How does the TPS61197DR handle fault conditions?
The device has an open-drain fault indicator pin that indicates abnormal conditions and can be pulled up to a high voltage level through an external resistor.
- What package type and size is the TPS61197DR available in?
The TPS61197DR is available in a 16-pin SOIC package with dimensions of 17.90 mm × 7.50 mm.
- What are the typical applications of the TPS61197DR?
The typical applications include LCD TV backlighting, large LCD TV displays, and monitors.
