TPS92643-Q1 Evaluation Module User's Guide
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1 Introduction
The TPS92643EVM-204 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS92643-Q1 3.0-A buck switching regulator designed for high-current LED drive applications. The TPS92643-Q1 is designed to control high-brightness light-emitting diodes (LED) and features a wide input voltage range (5.5 V to 40 V), PWM dimming capability, analog dimming capability, input undervoltage lockout protection, fault detection, an internal 5-V regulator, and the ability to perform duty cycle control of the on-board, 1.6-kHz PMW signal.
2 Warnings and Cautions
Observe the following precautions when using the TPS92643EVM-204.
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| Caution! Do not leave EVM powered when unattended. |
| HOT SURFACE: |
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| Caution Hot Surface! Contact may cause burns. Do not touch. Please take the proper |
| precautions when operating. |
When choosing your LED component (not included with this EVM), the end user must consult the LED data sheet supplied by the LED manufacturer to identify the EN62471 Risk Group Rating and review any potential eye hazards associated with the LED chosen. Always consider and implement the use of effective light filtering and darkening protective eye wear and be fully aware of surrounding laboratory-type set-ups when viewing intense light sources that can be required to minimize or eliminate such risks in order to avoid accidents related to temporary blindness.
3 Description
This user's guide describes the specifications, board connection descriptions, characteristics, operation, and use of the TPS92643-Q1, 3.0-A synchronous buck LED driver evaluation module (TPS92643EVM-204). The TPS92643-Q1 device implements an adaptive on-time average current mode control and is designed to be compatible with shunt FET dimming techniques and LED matrix manager-based dynamic beam headlamps. The adaptive on-time control provides near constant switching frequency that can be set from 100 kHz to 2.2 MHz. Inductor current sensing and closed-loop feedback enables better than ±4% accuracy over wide input voltage, output voltage and ambient temperature range.
TPS92643EVM-204 provides a high-brightness LED driver that is designed to operate with an input voltage in the range of 5.5 V to 36 V (nominally at 14 V). The EVM is setup for a default output current of 2.5 A (programmable to 3 A) for an LED stack between approximately 3 V and nearly 32 V operating at 440 kHz. The TPS92643-Q1 helps provide high efficiency, fast PWM dimming, and accurate wide-range analog dimming.
