Overview
The TPS61196PWPR from Texas Instruments is a highly integrated current mode boost controller designed specifically for driving up to six WLED strings in LCD TV backlight applications. It features an independent PWM dimming function for each string, allowing for precise control over brightness. The device operates with an input voltage range of 8 V to 30 V and can produce an output voltage of up to 120 V. Each string has an independent current regulator, enabling LED current adjustment from 50 mA to 400 mA with ±1.5% matching accuracy between strings.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 8 V to 30 V |
| Output Voltage | Up to 120 V |
| Switching Frequency | 100 kHz to 800 kHz (programmable) |
| Current per String | 200 mA continuous, 400 mA pulse |
| Current Matching Accuracy | ±1.5% between strings |
| PWM Dimming Resolution | Up to 5000:1 |
| PWM Frequency Range | 90 Hz to 22 kHz |
| Package Type | 28-pin HTSSOP (PWP) with PowerPAD |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- Adaptive boost output for LED voltages
- Six current sinks with 200 mA continuous and 400 mA pulse output for each string
- High precision PWM dimming resolution up to 5000:1
- Programmable overvoltage threshold at output and each current sink
- Programmable undervoltage threshold at input with adjustable hysteresis
- Adjustable soft start time independent of dimming duty cycle
- Built-in LED open and short protection, Schottky diode open/short protection, ISET short protection, and IFB short protection
- Thermal shutdown and overtemperature protection
- Built-in linear regulator for internal circuitry power supply
Applications
The TPS61196PWPR is primarily designed for LCD TV backlight applications, where it drives multiple WLED strings with high efficiency and precision. It is also suitable for other display backlighting applications that require independent PWM dimming and high current accuracy.
Q & A
- What is the input voltage range of the TPS61196PWPR?
The input voltage range is from 8 V to 30 V.
- How many WLED strings can the TPS61196PWPR drive?
The device can drive up to six WLED strings.
- What is the maximum output voltage of the TPS61196PWPR?
The maximum output voltage is up to 120 V.
- What is the switching frequency range of the TPS61196PWPR?
The switching frequency can be programmed from 100 kHz to 800 kHz.
- What is the current range per string for the TPS61196PWPR?
Each string can handle 200 mA continuous and 400 mA pulse current.
- What is the PWM dimming resolution of the TPS61196PWPR?
The PWM dimming resolution is up to 5000:1.
- Does the TPS61196PWPR have built-in protection features?
Yes, it includes LED open and short protection, Schottky diode open/short protection, ISET short protection, IFB short protection, and thermal shutdown.
- How is the soft start time adjusted in the TPS61196PWPR?
The soft start time is adjustable using an external capacitor and is independent of the dimming duty cycle.
- What package type is the TPS61196PWPR available in?
The device is available in a 28-pin HTSSOP (PWP) package with PowerPAD.
- What is the operating temperature range of the TPS61196PWPR?
The operating temperature range is from -40°C to 85°C.
