TPS61177A Texas instruments

TPS61177A

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TPS61177A

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Описание

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.

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

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