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TPS61196

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6-String 400-mA WLED driver with Independent PWM dimming for Each String

Product details

Number of channels 6 Vin (min) (V) 8 Vin (max) (V) 30 Vout (min) (V) 8 Vout (max) (V) 120 Type Inductive Switching frequency (max) (kHz) 800 Duty cycle (max) (%) 96 LED current per channel (mA) 200 Peak efficiency (%) 96 Topology Boost Features OVP Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 8 Vin (max) (V) 30 Vout (min) (V) 8 Vout (max) (V) 120 Type Inductive Switching frequency (max) (kHz) 800 Duty cycle (max) (%) 96 LED current per channel (mA) 200 Peak efficiency (%) 96 Topology Boost Features OVP Operating temperature range (°C) -40 to 85 Rating Catalog
HTSSOP (PWP) 28 62.08 mm² 9.7 x 6.4
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet TPS61196 6-String 400-mA WLED Driver with Independent PWM Dimming for Each String datasheet (Rev. D) PDF | HTML 01 May 2015
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note Some Guidelines and Tips for the LED Driver Application 14 Aug 2019
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) 11 Dec 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide TPS61196EVM-600 User's Guide (Rev. A) 25 Feb 2014

Design & development

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Evaluation board

TPS61196EVM-600 — WLED Driver String Evaluation Module

The Texas Instruments TPS61196EVM-600 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS61196 , which are multi-channel WLED drivers providing highly integrated solutions for LCD TV backlight. The EVM is designed to operate from an input voltage source ranging (...)

User guide: PDF
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PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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HTSSOP (PWP) 28 View options

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