Startseite Energiemanagement LED-Treiber LED-Hintergrundbeleuchtungstreiber
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LED-Hintergrundbeleuchtungstreiber

TPS61181A

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LED-Treiber für sechs Strings für Notebook-Anwendungen

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Datenblatt

TPS61181A

AKTIV
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Produktdetails

Number of channels 6 Vin (min) (V) 5 Vin (max) (V) 24 Vout (min) (V) 5 Vout (max) (V) 39 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 90 Topology Boost Features Load Disconnect During Shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 5 Vin (max) (V) 24 Vout (min) (V) 5 Vout (max) (V) 39 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 90 Topology Boost Features Load Disconnect During Shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
WQFN (RTE) 16 9 mm² 3 x 3
  • 4.5-V to 24-V Input Voltage
  • 38-V Maximum Output Voltage
  • Integrated 1.5-A/40-V MOSFET
  • 1-MHz Switching Frequency
  • Adaptive Boost Output to WLED Voltages
  • Small External Components
  • Integrated Loop Compensation
  • Six Current Sinks of 30 mA
  • Up to 10 WLED in Series
  • 1% Typical Current Matching and Accuracy
  • Up to 1000:1 PWM Brightness Dimming
  • Minimized Output Ripple Under PWM Dimming
  • Driver for Input/Output Isolation PFET
  • True Shutdown
  • Overvoltage Protection
  • WLED Open and Short Protection
  • Built-in Soft Start
  • 4.5-V to 24-V Input Voltage
  • 38-V Maximum Output Voltage
  • Integrated 1.5-A/40-V MOSFET
  • 1-MHz Switching Frequency
  • Adaptive Boost Output to WLED Voltages
  • Small External Components
  • Integrated Loop Compensation
  • Six Current Sinks of 30 mA
  • Up to 10 WLED in Series
  • 1% Typical Current Matching and Accuracy
  • Up to 1000:1 PWM Brightness Dimming
  • Minimized Output Ripple Under PWM Dimming
  • Driver for Input/Output Isolation PFET
  • True Shutdown
  • Overvoltage Protection
  • WLED Open and Short Protection
  • Built-in Soft Start

The TPS61181A device provides highly integrated solutions for media-size LCD backlighting. The six current sink regulators provide high-precision current regulation and matching. In total, the device can support up to 60 WLEDs.

The devices support pulse width modulation (PWM) brightness dimming. During dimming, the WLED current is turned on/off at the duty cycle and frequency, determined by the PWM signal input to the DCRTL pin. The TPS61181A device is designed to minimize the output AC ripple across a wide dimming duty cycle and frequency range and also reduces the audible noise from the output ceramic capacitors.

The TPS61181A device provides a driver output for an external PFET connected between the input and inductor. During short circuit or overcurrent conditions, the device turns off the external PFET and disconnects the battery from the WLEDs. The PFET is also turned off during device shutdown (thereby giving shutdown) to prevent any leakage current from the battery. The device integrates overvoltage protection, soft-start and thermal shutdown and has a built-in linear regulator for the device supply.

For all available packages, see the orderable addendum at the end of the data sheet.

The TPS61181A device provides highly integrated solutions for media-size LCD backlighting. The six current sink regulators provide high-precision current regulation and matching. In total, the device can support up to 60 WLEDs.

The devices support pulse width modulation (PWM) brightness dimming. During dimming, the WLED current is turned on/off at the duty cycle and frequency, determined by the PWM signal input to the DCRTL pin. The TPS61181A device is designed to minimize the output AC ripple across a wide dimming duty cycle and frequency range and also reduces the audible noise from the output ceramic capacitors.

The TPS61181A device provides a driver output for an external PFET connected between the input and inductor. During short circuit or overcurrent conditions, the device turns off the external PFET and disconnects the battery from the WLEDs. The PFET is also turned off during device shutdown (thereby giving shutdown) to prevent any leakage current from the battery. The device integrates overvoltage protection, soft-start and thermal shutdown and has a built-in linear regulator for the device supply.

For all available packages, see the orderable addendum at the end of the data sheet.

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Technische Dokumentation

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Typ Titel Datum
* Data sheet TPS61181A White-LED Driver For Notebook Display datasheet (Rev. B) PDF | HTML 30 Sep 2016
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 Dez 2018
Analog Design Journal Backlighting the tablet PC 17 Jun 2011
EVM User's guide TPS61181EVM-259 / TPS61182EVM-259 (Rev. B) 12 Mai 2011

Design und Entwicklung

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The TPS61181AEVM-259 user's guide describes the characteristics, operation, and use of the TPS6118xEVM-259 evaluation module (EVM). This EVM contains either Texas Instruments' TPS61181 (-001 build) or TPS61182 (-002 build) or TPS61181A (-003 build)-based WLED power solutions, each of which provides (...)

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