Test Procedure for the CAT4201AGEVB Evaluation Board Introduction This document describes the test procedure for the CAT4201 evaluation board. The test procedure must be followed step-by step in order to verify that the evaluation board is fully functional. Test set-up The CAT4201 evaluation board must have the jumper J1 installed between pins 2 and 3 (right position). The test set-up uses the LED module plugged into the CAT4201 evaluation board. The LED current is measured by removing the LED module jumper J2 and connecting an ammeter (A) between those two pins, see figure below. VS = 12V ISUPPLY = 100mA V V = 0.22V ILED = 300mA + PS - A J2 J1 Pot R2 Legend: ƒ (PS) = 12V DC power supply, connected between GND and VBAT ƒ (A) = Ammeter, connected to LED module across J2 connector (jumper removed) ƒ (V) = Voltmeter, connected between R1/R2 midpoint and GND Note: The LED of the LED module is very bright and should be covered for eye protection. 11/12/2009 1 of 2 www.onsemi.com Test Procedure The test procedure is achieved by following the sequence below step-by-step. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Connect the voltmeter (V) between R1/R2 midpoint and GND. Connect the power supply (PS) between VBAT (+) and GND (-). Turn the power supply on. Measure the voltage on voltmeter (V). Turn the potentiometer R2 and adjust until voltage is 0.22V. Measure the LED current (A). The LED current must be between: 270mA ≤ ILED ≤ 330mA. Measure the supply current on the power supply. The supply current must be between: 90mA ≤ ISUPPLY ≤ 115mA. Turn off the power supply (PS). Disconnect the CAT4201 evaluation board. Appendix CAT4201 evaluation board schematic LED+ VBAT R4 1Ω 0.25W K3 C1 LED+ U1 D 4.7µF C2 1 0µF VBAT CAT4201 NC NC RSET CTRL LED- LEDn- SW 33µH GND R2 47kΩ LED Module CTRL PNP R3 1kΩ >1V J2 LED- L R1 8.2kΩ LEDn+ R7 10kΩ Q1 1 J1 R8 10kΩ Note: LED+ is at lower half of PCB. LED– is at upper half of PCB. R5 0V PWM 11/12/2009 1kΩ Q2 NPN R6 47kΩ 2 of 2 www.onsemi.com