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RT7297CHZSP Datasheet(PDF) 5 Page - Richtek Technology Corporation |
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RT7297CHZSP Datasheet(HTML) 5 Page - Richtek Technology Corporation |
5 / 11 page RT7297CHZSP Evaluation Board UG7297CHZSP-00 July 2014 www.richtek.com 5 Power-up & Measurement Procedure 1. Apply a 12V nominal input power supply (4.5V < VIN < 18V) to the VIN and GND terminals. 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 μF, 16V X5R ceramic types. Do not exceed their operating voltage 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. |
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