Description of the TPS61194 or TPS61194-Q1 Device
3
Description of the TPS61194 or TPS61194-Q1 Device
The TPS61194 or TPS61194-Q1 is an automotive high-efficiency LED driver with integrated boost/SEPIC
converter. It has 4 high-precision current sinks that can be controlled by a PWM input signal.
The boost converter has adaptive output voltage control based on the LED current sink headroom
voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level
in all conditions. Boost controller supports spread spectrum for switching frequency and an external
synchronization with a dedicated pin. The high switching frequency allows the TPS61194 or TPS61194-
Q1 to avoid disturbance for AM radio band.
The input voltage range for the TPS61194 or TPS61194-Q1 is from 4.5 V to 40 V to support automotive
stop/start and load dump condition. The TPS61194 or TPS61194-Q1 device supports PWM brightness
dimming ratio up to 10 000:1 for input PWM frequency of 200 Hz. The device integrates extensive safety
and protection features.
3.1
Features
•
Four High-Precision Current Sinks
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Current Matching 1% (typical)
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Output Current up to 100 mA/Channel
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Dimming Ratio 10 000:1 at 200-Hz PWM input
•
Integrated Boost/SEPIC for LED String Power
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Output Voltage up to 45 V
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Switching Frequency 300 kHz to 2.2 MHz
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Boost Synchronization Input
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Spread Spectrum
•
Input Voltage Operating Range 4.5 V to 40 V
•
Power-Line FET Control for Inrush Current Protection and Standby Energy Saving
•
Extensive Safety and Fault Tolerance Features
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Fault Output
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Input Voltage OVP and UVLO
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Open and Shorted LED Fault Detection
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Thermal Shutdown
•
Minimum Number of External Components
3.2
Applications
•
Industrial Backlighting Systems in Control Panels (TPS61194)
•
Test and Measurement Equipment (TPS61194)
•
Automotive Infotainment, Instrument Clusters, and Backlighting System (TPS61194-Q1)
5
SNVU492 – January 2016
TPS61194xEVM Evaluation Module
Copyright © 2016, Texas Instruments Incorporated