TPS61196 - 6 灯串 400 mA WLED 驱动器，可对每个灯串进行独立 PWM 明暗调节

TPS61196是TI德州仪器公司的一款背光产品，TPS61196是6 灯串 400 mA WLED 驱动器，可对每个灯串进行独立 PWM 明暗调节，本站介绍了TPS61196的封装应用图解、特点和优点、功能等，并给出了与TPS61196相关的TI元器件型号供参考。

TPS61196 - 6 灯串 400 mA WLED 驱动器，可对每个灯串进行独立 PWM 明暗调节 - 背光 - LED驱动器 - 德州仪器

产品特性

8-V to 30-V Input Voltage
Up to 120-V Output Voltage
100-KHz to 800-kHz Programmable Switching Frequency
Adaptive Boost Output for LED Voltages
Six Current Sinks, 200-mA Continuous Output, 400-mA Pulse Output for Each String
±1.5% Current Matching Between Strings
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 LED Short Protection
Built-in Schottky Diode Open/Short Protection
Built-in ISET Short Protection
Built-in IFB Short Protection
Thermal Shutdown

产品应用

LCD TV Backlight
Scan Mode LCD TV Backlight

产品说明

The TPS61196 provides a highly integrated solution for LCD TV backlight with an independent PWM dimming function for each string. This device is a current mode boost controller driving up to six WLED strings with multiple LEDs in series. Each string has an independent current regulator providing a LED current adjustable from 50 mA to 400 mA within ±1.5% matching accuracy. The minimal voltage at the current sink is programmable in the range of 0.3 V to 1 V to fit with different LED current settings. The input voltage range for the device is from 8 V to 30 V.

The device adjusts the boost controller's output voltage automatically to provide only the voltage required by the LED string with the largest forward voltage drop plus the minimum required voltage at that string's IFB pin, thereby optimizing driver efficiency. Its switching frequency is programmed by an external resistor from 100 kHz to 800 kHz.

The TPS61196 supports direct PWM brightness dimming. Each string has an independent PWM control input. During the PWM dimming, the LED current is turned on or turned off at the frequency and duty cycle which are determined by the external PWM signal. The PWM frequency ranges from 90 Hz to 22 kHz.

The device integrates overcurrent protection, output short-circuit protection, ISET short-to-ground protection, diode open and short protection, LED open and short protection, and overtemperature shutdown circuit. In addition, the TPS61196 can detect the IFB pin short to ground to protect the LED string. The device also provides programmable input undervoltage lockout threshold and output overvoltage protection threshold.

The TPS61196 has a built-in linear regulator which steps down the input voltage to the VDD voltage for powering the internal circuitry. An soft-start circuit is implemented internally to work with an external capacitor to adjust the soft start-up time to minimize the in-rush current during boost converter start-up. The device is available in a 28-pin HTSSOP package with PowerPAD™.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
TPS61196	HTSSOP (28)	9.70 mm x 4.40 mm

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