step-down LED driver. Boards equipped with a 9 V battery
and separate LED module can be used for demonstrations
(see Figure 1).
The CAT4201 is a high efficiency step-down LED driver
from Catalyst Semiconductor. This device is designed to
drive high brightness LEDs up to 350 mA from a power
supply up to 28 V. The LED brightness is controlled by a
single resistor from the RSET pin to GND. Analog dimming
and idle mode control are available through the CTRL input.
An external circuit is provided on the CAT4201AGEVB for
PWM dimming.
Operation Procedure
EVAL BOARD USER’S MANUAL
long as the CTRL pin is greater than 3 V. LED current can
be set from 70 mA to 350 mA by adjusting potentiometer
R2.
To set the board for PWM dimming, jumper J1 should be
placed in the left side position with pins 1 and 2 tied together.
A PWM signal can be applied to the PWM pin to dim the
LED brightness. The amplitude of the PWM signal should
be greater than 1 V.
Device Demonstration
The CAT4201AGEVB board has two modes of operation.
The first is normal operation and the second is operation
with PWM dimming. Normal operation is set by placing
jumper J1 in the right side position with pins 2 and 3 tied
together. In this mode, the CTRL pin is pulled up to the LED
cathode (LED−). The LED(s) will be at full brightness as
To set up the CAT4201AGEVB for demonstrations, the
board should be configured for normal operation with a 9 V
battery securely placed in the holder. A separate LED
module should also be plugged into the 6-pin connector, as
shown in Figure 1. To turn on the LED, press and hold the
POWER
button. The LED will turn off once the button is
released.
Figure 1. CAT4201AGEVB with LED Module
Semiconductor Components Industries, LLC, 2013
July, 2013
−
Rev. 1
1
Publication Order Number:
EVBUM2205/D
CAT4201AGEVB
SCHEMATIC
Figure 2. CAT4201AGEVB Schematic
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2
CAT4201AGEVB
TEST PROCEDURE FOR THE CAT4201AGEVB EVALUATION BOARD
Introduction
Test Set-up
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.
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.
V
V
S
= 12 V
I
SUPPLY
= 100 mA
V = 0.22 V
I
LED
= 300 mA
+
PS
−
J2
A
J1
Pot R2
Legend:
ƒ (PS) = 12 V 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.
Figure 3. CAT4201AGEVB Test Set-up
Test Procedure
The test procedure is achieved by following the sequence
below step-by-step.
1. Connect the voltmeter (V) between R1/R2
midpoint and GND.
2. Connect the power supply (PS) between VBAT (+)
and GND (−).
3. Turn the power supply on.
4. Measure the voltage on voltmeter (V).
5. Turn the potentiometer R2 and adjust until voltage
is 0.22 V.
6. Measure the LED current (A).
7. The LED current must be between:
270 mA
I
LED
330 mA.
8. Measure the supply current on the power supply.
9. The supply current must be between:
90 mA
I
SUPPLY
115 mA.
10. Turn off the power supply (PS).
11. Disconnect the CAT4201 evaluation board.
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3
CAT4201AGEVB
Table 1. CAT4201AGEVB BILL OF MATERIALS
Name
U1
Q1
Q2
D
C1
C2
L
R1
R2
R3, R5
R4
R6
R7, R8
J1
J2
K3
Qty.
1
1
1
1
1
1
1
1
1
2
1
1
2
1
1
1
1
1
Description
High Efficiency Step-down LED Driver, SOT−23−5
PNP Bipolar Transistor
−45
V/−500 mA, SOT−23
NPN Bipolar Transistor 45 V/100 mA, SOT−23
Schottky Diode 40 V/500 mA, Size SOD−323
Ceramic Capacitor 4.7
mF/50
V, X7R, Size 1210
Ceramic Capacitor 10
mF/35
V, X5R, Size 1210
Inductor 33
mH,
low DCR, 0.97 A
SMT Resistor 1/10 W, 8.2 kW, 0603
Trim Pot. 47 kW
SMT Resistor 1/10 W, 1 kW, 0603
SMT Resistor 1
W/500
mW Size 1210
SMT Resistor 1/10 W, 47 kW, 0603
SMT Resistor 1/10 W, 10 kW, 0603
3 Pin Header Connector 0.1 Pitch
2 Pin Header Connector 0.1 Pitch
6 Pin Header Receptacle 0.1 Pitch
SPST Pushbutton Switch (Not Shown in Schematic)
9 V Battery Holder (Optional)
Manufacturer
ON Semiconductor
ON Semiconductor
ON Semiconductor
Central Semi
Murata
Taiyo Yuden
Sumida
Yageo
Vishay
Yageo
Panasonic
Yageo
Yageo
Tyco
Tyco
Tyco
HDK
Keystone
Part Number
CAT4201
BC807-25LT1G
BC847CLT1G
CMDSH05-4
GRM32ER71H475KA88L
GMK325BJ106KN-T
CDRH6D28-330
9C06031A8201FKHFT
T63YB473K
9T06031A1001FBHFT
ERJ-P14J1R0U
9T06031A4702FBHFT
9T06031A1002FBHFT
640452-3
640452-2
535676-5
KSM0631A
1294
ON Semiconductor
and
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