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TPS61177A

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WLED driver for notebook and Tablet display

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Data sheet

TPS61177A

ACTIVE
Data sheet Order now

Product details

Number of channels 6 Vin (min) (V) 2.5 Vin (max) (V) 24 Vout (min) (V) 4.5 Vout (max) (V) 39 Type Inductive Switching frequency (max) (kHz) 1200 Duty cycle (max) (%) 95 LED current per channel (mA) 30 Peak efficiency (%) 95 Topology Boost Features Analog Dimming, Analog/PWM mixed dimming, CABC, Direct PWM Dimming Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 2.5 Vin (max) (V) 24 Vout (min) (V) 4.5 Vout (max) (V) 39 Type Inductive Switching frequency (max) (kHz) 1200 Duty cycle (max) (%) 95 LED current per channel (mA) 30 Peak efficiency (%) 95 Topology Boost Features Analog Dimming, Analog/PWM mixed dimming, CABC, Direct PWM Dimming Operating temperature range (°C) -40 to 85 Rating Catalog
VQFN (RGR) 20 12.25 mm² 3.5 x 3.5
  • 2.5-V to 24-V Input Voltage Range
  • 39-V Maximum Output Voltage
  • Integrated 1.8-A, 40-V MOSFET
  • 450-kHz to 1.2-MHz Programmable Switching Frequency
  • Adaptive Boost Output to WLED Voltages
  • 100-Hz to 25-kHz Wide Input PWM Dimming Frequency Range
  • 1% Minimum Dimming Duty Cycle
  • Small External Components
  • Integrated Loop Compensation
  • Six Current Sinks of 30 mA Maximum
  • 1% (Typical) Current Matching
  • Input PWM Glitch Filter
  • PWM Brightness Interface Control
  • Three Optional Dimming Methods, including Direct PWM Dimming, Analog Dimming, and Analog and PWM Mixed Dimming
  • Built-in WLED Open Protection
  • Thermal Shutdown
  • 2.5-V to 24-V Input Voltage Range
  • 39-V Maximum Output Voltage
  • Integrated 1.8-A, 40-V MOSFET
  • 450-kHz to 1.2-MHz Programmable Switching Frequency
  • Adaptive Boost Output to WLED Voltages
  • 100-Hz to 25-kHz Wide Input PWM Dimming Frequency Range
  • 1% Minimum Dimming Duty Cycle
  • Small External Components
  • Integrated Loop Compensation
  • Six Current Sinks of 30 mA Maximum
  • 1% (Typical) Current Matching
  • Input PWM Glitch Filter
  • PWM Brightness Interface Control
  • Three Optional Dimming Methods, including Direct PWM Dimming, Analog Dimming, and Analog and PWM Mixed Dimming
  • Built-in WLED Open Protection
  • Thermal Shutdown

The TPS61177A device provides a highly integrated white LED (WLED) driver solution for notebook LCD backlight. This device has a built-in high-efficiency boost regulator with integrated 1.8-A, 40-V power MOSFET. The six current sink regulators provide high precision current regulation and matching. In total, the device can support up to 72 WLEDs. In addition, the boost output automatically adjusts its voltage to the WLED forward voltage to optimize efficiency.

The TPS61177A supports the analog dimming, analog and PWM dimming, and direct PWM dimming method. During analog dimming mode, each CS current linearly varies depending on the duty cycle information on the PWMB pin. During analog and PWM mixed dimming mode, the input PWM duty cycle information is translated to an analog signal to control the WLED current linearly over 25% to 100% brightness area. The device also allows adding PWM dimming when the analog current is down to 25%. Below 25%, the analog signal translates to PWM duty cycle information to control the on or off of WLED current and averages the WLED current down to 1%. The frequency of adding PWM dimming is same to input PWM frequency on the PWMB pin. While the TPS61177A also supports a direct PWM dimming method, in direct PWM dimming mode the WLED current is turned on or off, synchronized with the input PWM signal.

The TPS61177A device provides a highly integrated white LED (WLED) driver solution for notebook LCD backlight. This device has a built-in high-efficiency boost regulator with integrated 1.8-A, 40-V power MOSFET. The six current sink regulators provide high precision current regulation and matching. In total, the device can support up to 72 WLEDs. In addition, the boost output automatically adjusts its voltage to the WLED forward voltage to optimize efficiency.

The TPS61177A supports the analog dimming, analog and PWM dimming, and direct PWM dimming method. During analog dimming mode, each CS current linearly varies depending on the duty cycle information on the PWMB pin. During analog and PWM mixed dimming mode, the input PWM duty cycle information is translated to an analog signal to control the WLED current linearly over 25% to 100% brightness area. The device also allows adding PWM dimming when the analog current is down to 25%. Below 25%, the analog signal translates to PWM duty cycle information to control the on or off of WLED current and averages the WLED current down to 1%. The frequency of adding PWM dimming is same to input PWM frequency on the PWMB pin. While the TPS61177A also supports a direct PWM dimming method, in direct PWM dimming mode the WLED current is turned on or off, synchronized with the input PWM signal.
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Type Title Date
* Data sheet TPS61177A WLED Driver for Notebooks With PWM Interface and Mixed Dimming Mode datasheet (Rev. B) PDF | HTML 14 Mar 2017
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
User guide Using the TPS61177A Evaluation Board 11 Sep 2015

Design & development

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Evaluation board

TPS61177AEVM — TPS61177A Evaluation Module for WLED Driver for Notebook Applications

TPS61177AEVM is eval platform for WLED Driver application for Notebooks and tablet PCs with PWM Interface and Mixed Dimming Mode. EVM tool kit includes USB2ANY box for I2C communication to configure/control TPS61177A WLED driver's EEPROM registers such as boost switch freq, LED string current, (...)

User guide: PDF
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GUI for evaluation module (EVM)

SLVC649 — TPS61177A EVM GUI

Supported products & hardware

Supported products & hardware

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Backlight LED drivers
TPS61177A — WLED driver for notebook and Tablet display
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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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VQFN (RGR) 20 Ultra Librarian
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