RT7297CHZSP

Evaluation Board

UG7297CHZSP-00

July

2014

www.richtek.com

5

Power-up & Measurement Procedure

1.

2.

The EN voltage is pulled to logic high

by R4 (100kΩ to VIN) to enable operation. Drive EN high (>2.7V) to

enable operation or low (<0.4V) to disable operation.

3.

Verify the output voltage (approximately 3.3V) between VOUT and GND.

4.

Connect an external load up to 3A to the VOUT and GND terminals and verify the output voltage and current.

Output Voltage Setting

Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to

FB. The output is set by the following formula:

OUT

R1

V

= 0.8 x (1 +

)

R2

The installed VOUT capacitors (C4, C5) are 22

range and consider their voltage coefficient (capacitance vs. bias voltage) and ensure that the capacitance is

sufficient to maintain stability and provide sufficient transient response for your application. This can be verified by

checking the output transient response as described in the RT7297C IC datasheet.