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TPS61177A

現行

適用筆記本電腦和平板電腦顯示器的 WLED 驅動器

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產品規格表

TPS61177A

現行
產品規格表 立即訂購

產品詳細資料

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 mm × 3.5 mm)
  • 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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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 TPS61177A WLED Driver for Notebooks With PWM Interface and Mixed Dimming Mode datasheet (Rev. B) PDF | HTML 2017/3/14
白皮書 Common LED Functions and LED Driver Design Considerations 2020/9/21

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開發板

TPS61177AEVM — 適用於筆記型電腦應用的 TPS61177A WLED 驅動器評估模組

TPS61177AEVM 是 WLED 驅動器應用的評估平台，適用於搭載 PWM 介面和混合調光模式的筆記型電腦和平板電腦。EVM 工具套件包括適用於 I2C 通訊的 USB2ANY 盒，可配置/控制 TPS61177A WLED 驅動器的 EEPROM 暫存器，例如升壓開關頻率、LED 燈串電流、調光模式及 UVLO 位準。TPS61177AEVM 是 WLED 驅動器應用的評估平台，適用於搭載 PWM 介面和混合調光模式的筆記型電腦和平板電腦。EVM 工具套件包括適用於 I2C 通訊的 USB2ANY 盒，可配置/控制 TPS61177A WLED 驅動器的 EEPROM (...)
使用指南: PDF
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SLVC649 — TPS61177A EVM GUI

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