TPS61177A Series

WLED driver for notebook and Tablet display with Mixed Mode dimming

Catalog

WLED driver for notebook and Tablet display with Mixed Mode dimming

Part	Voltage - Supply (Min) [Min]	Voltage - Output [Min]	Voltage - Output [Max]	Mounting Type	Applications	Frequency	Operating Temperature [Max]	Operating Temperature [Min]	Type	Voltage - Supply (Max) [Max]	Dimming	Package / Case	Topology	Number of Outputs	Current - Output / Channel	Utilized IC / Part	Features	Outputs and Type	Outputs and Type	Voltage - Input [Max]	Voltage - Input [Min]	Supplied Contents
Texas Instruments TPS61177ARGRR	2.5 V	4.5 V	39 V	Surface Mount	Backlight	1.2 MHz	85 °C	-40 °C	DC DC Regulator	24 V	Analog PWM	20-VFQFN Exposed Pad	Step-Up (Boost)	6	30 mA
Texas Instruments TPS61177AEVM																TPS61177A	Dimmable	6	Non-Isolated	24 V	2.5 V	Board(s)
Texas Instruments TPS61177RGRR	2.5 V			Surface Mount	Backlight	1.25 MHz	85 °C	-40 °C	DC DC Regulator	24 V	Analog PWM	20-VFQFN Exposed Pad	Step-Up (Boost)	6	30 mA

Catalog

WLED driver for notebook and Tablet display with Mixed Mode dimming

Key Features

• 2.5V to 24V Input Voltage Range39 V Maximum Output VoltageIntegrated 1.8 A /40 V MOSFET450 kHz to 1.2 MHz Programmable Switching FrequencyAdaptive Boost Output to WLED Voltages100Hz to 25kHz Wide Input PWM Dimming Frequency Range1% Minimum Dimming Duty CycleSmall External ComponentsIntegrated Loop CompensationSix Current Sinks of 30mA Max1% (Typical) Current MatchingInput PWM Glitch FilterPWM Brightness Interface ControlThree Optional Dimming Methods, Including Direct PWM Dimming, Analog Dimming and Analog/PWM Mixed DimmingBuilt-in WLED Open ProtectionThermal Shutdown20 Leads 3.5mm × 3.5mm × 0.9mm QFN Package2.5V to 24V Input Voltage Range39 V Maximum Output VoltageIntegrated 1.8 A /40 V MOSFET450 kHz to 1.2 MHz Programmable Switching FrequencyAdaptive Boost Output to WLED Voltages100Hz to 25kHz Wide Input PWM Dimming Frequency Range1% Minimum Dimming Duty CycleSmall External ComponentsIntegrated Loop CompensationSix Current Sinks of 30mA Max1% (Typical) Current MatchingInput PWM Glitch FilterPWM Brightness Interface ControlThree Optional Dimming Methods, Including Direct PWM Dimming, Analog Dimming and Analog/PWM Mixed DimmingBuilt-in WLED Open ProtectionThermal Shutdown20 Leads 3.5mm × 3.5mm × 0.9mm QFN Package

Description

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.