TPS92682EVM-070

TPS92682-Q1 CC2 CHANNEL LED DRIV

This user's guide describes the specifications, board connection description, characteristics, operation, and use of the TPS92682-Q1 constant current (CC) mode in boost and boost-to-battery configurations. The TPS92682-Q1 device implements a fixed-frequency peak current mode control technique with programmable switching frequency, slope compensation, and soft-start. Additional features include wide input voltage range (4.5 V to 65 V), programmable spread spectrum frequency modulation, programmable fault handling, and adjustable output current setting. A complete schematic diagram, printed circuit board layouts, and bill of materials are included in this document.

1  Trademarks

SimpleLink, LaunchPad are trademarks of Texas Instruments.

2 Description

The TPS92682EVM-70 solution provides a two channel, constant current boost and boost-to-battery LED current regulator which is configurable via serial peripheral interface (SPI). The EVM is designed to operate with an input voltage in the range of 6.5 V to 20 V. The EVM provides maximum output power of 25 Wfor boost channel and 15 W for the boost-to-battery channel. The TPS92682EVM-70 provides high efficiency, SPI programmable fault handling, ILED setting, and spread-spectrum. The channel-1 of the EVM is configured as CC boost and channel-2 as CC boost-to-battery.

2.1 Typical Applications

This document outlines the operation and implementation of the TPS92682-Q1 as a two-channel boost and boost-to-battery LED current regulator with the specifications listed in Table 3. For applications with a different input voltage range or different ILED range, refer to the TPS92682-Q1 data sheet. The MSP EXP432E401Y SimpleLink™ Ethernet MSP432E401Y MCU LaunchPad™ Development Kit controls the TPS92682EVM-70 evaluation board. The MSP-EXP432E401Y is available on TI website. However, any SPI controller can be used to program the TPS92682EVM board. Ensure that the LaunchPad board from TI has been programmed before running the GUI. The programming instructions are provided in Section 7.

2.2 Warnings

Observe the following precaution when using the TPS92682EVM-70 evaluation module.

2.3 Connector Description

Table 1 describes the connectors and Table 2 lists the test points on the EVM and how to properly connect, set up, and use the TPS92682EVM-70.

Figure 1 shows the connection diagram and the default jumper locations of the TPS92682EVM-70.

Schematic

Layout

The TPS92682EVM-70 is a four-layer board. Figure 13, Figure 14, Figure 15, Figure 16 and Figure 17 illustrate the assembly, the top, the inner-layer1, the inner-layer2 and the bottom side of the TPS92682EVM-70 PCB layout. The Inner-layer 1 is a ground plane and there is no routing on this layer.