CAT4201AGEVB_TEST_PROCEDURE.PDF - 318.0 KB

 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 
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