TPS61372EVM-033 Evaluation Module User Guide

This user's guide describes the setup, schematic and layout of the evaluation module (EVM) for the TPS61372. The EVM helps to evaluate the behavior and performance of the TPS61372 at different input voltages, output voltages and load conditions. The input voltage is from 2.5 V to 5 V, and the output voltage is set to 12 V. This can be changed through external feedback resistors. Two jumpers are placed to test the EN and MODE pin function.

The TPS61372EVM is manufactured before the TPS61372 is finally released, so the IC in the EVM may be not the final version. The marking on the IC indicates "XTPS" instead of "TPS" for the final IC version. The reference voltage, switching frequency and current limitation may have larger variations. For example, the reference voltage of the IC is approximately 4% higher than specified value. However, the output ripple, efficiency, line and load transient and other behaviors of the IC are the same as the final version IC.

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1 Setup

Table 1 provides the input voltage, output voltage and load condition of TPS61372EVM-033. The output voltage can be modified by changing the high-side feedback resistors, that are connected between the output and the FB pin. The TPS61372 limits the inductor peak current to typical 3.6 A, thus the maximum output current depends on the input and output voltage.

No power sequence is required to start the EVM. The device regulates its output voltage when the input voltage is ready and EN pin is logic high. The output voltage may be approximately 12.5 V for the "XTPS" marked version, as it is not the final version.

Table 1. Performance Specification

Specification	Test Condition	MIN	TYP	MAX	UNIT
Input voltage		2.5	3.6	5	V
Output voltage	V_IN = 3.6 V, I_OUT = 0.6 A		12		V
Output Current	V_IN = 3.6 V	0	0.6		A

2 Schematic

Figure 1 shows the schematic of the TPS61372EVM. Some components are used to evaluate the IC easily but unnecessary in real application, such as the 150-µF input capacitor C2, feedback resistor R4. The J5 and J6 are to detect the input and output voltages close to the IC.

The long cable between the power supply and the EVM introduces large parasitic inductance. This parasitic inductor could "ring" with the ceramic capacitor if not using a 50-mΩ ESR, 150-µF tantalum capacitor. Normally, the parasitic inductor is much smaller in real applications; so, the tantalum capacitor is not required.

The 49.9-Ω R4 is used to measure the Bode plot; this helps to estimate the stability of the boost converter while evaluating the IC. Two resistors, R2 and R3 in series, can help to precisely select the feedback divider. One resistor may be good enough for real applications.

Figure 1. Schematic of the TPS61372EVM