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CAT4238AEVB
The board is powered from an external voltage applied to
the V IN (T1) pad. The circuit is delivered with no LEDs
soldered on board. The user can solder his white LEDs on the
CAT4138 board (8 to 10 LED string pads layout provided)
or he can choose to connect the LEDs from his application
between V OUT (T7) and LED (T10) test points.
The LED current is set through the external resistors
connected to the FB pin (R1, R2). Using the variable resistor
R2, the LED current can be set from 3 mA to 40 mA. Most
white LEDs are driven at a maximum current between
15 mA and 20 mA to ensure a pure “white” light.
PWM signal or a DC voltage. Resistors R3 and R5
(R5 – soldered on board by the user) are used to adjust the
LED current using the dimming control with an external
applied DC voltage on the FB pin. The ON/OFF operation
and dimming control can be selected using the jumper
options for the J1 connector.
Test points T1 to T10 are available to apply the external
voltages/signal generator or to measure the output
voltages/signals provided by CAT4238.
The component placement is shown in Figure 2. Table 1
presents the component list for this evaluation board.
The board also demonstrates the CAT4238 shutdown
mode and LED brightness control by using an external
Figure 2. CAT4238AEVB Board
Table 1. CAT4238AGEVB BOARD LIST OF COMPONENTS
Name
U1
C1
C2
L1
D1
R1
R2
R3
R4
R5
L1 to L10
J1
J2 to J4
T1 to T10
Manufacturer
ON Semiconductor
Taiyo Yuden
(or Panasonic)
Taiyo Yuden
(or Kemet)
Sumida
Central Semi
Yageo
Bourns
Yageo
Yageo
Yageo
Nichia
Mil-Max
Description
CMOS White LED Driver, TSOT23 - 5pin
Ceramic Capacitor 4.7 m F/6.3 V, X5R, Size 0805
Ceramic Capacitor 0.22 m F/50 V, X5R(X7R)
Inductor 47 m H, Low DCR, High Current
Schottky Diode, Low VF, 40 V, 500 mA, SOD-323
SMT Resistor 1/16 W, 6.81 W , 0603
Trimmer Pot, 1/4”, 100 W
SMT Resistor 1/16 W, 1.0 k W , 0603
SMT Resistor 1/16 W, 200 k W , 0603
Metal Film Resistor 1/16W, 10k W
(Not Soldered on Board)
White LED, SMT (Optional)
6-pin Header Connector, 0.1”, Single Strip
2-pin Header Connector, 0.1”, Single Strip
(optional)
Pin Receptacle (Test Points)
Part Number
CAT4238TD-G
JMK212BJ475
(or Digi-Key PCC2315CT-ND)
UMK212BJ224KG
(Digi-Key 587-1287-1-ND)
CDC5D23B-470
(or CDR6D23MN-470)
CMDSH05-4
Digi-Key 311-6.81HCT-ND
3329W-101-ND (or equiv)
Digi-Key 311-1.0KHCT-ND
Digi-Key 311-200KHCT-ND
Digi-Key 10.0KXBK-ND
NSCW100 or NSCW335
Digi_Key S1012-06-ND (or equiv)
Digi_Key S1012-02-ND (or equiv)
#0149-0-15-01-30-14-04-0 (or equiv)
Units
1
1
1
1
1
1
1
1
1
10
1
3
10
http://onsemi.com
2
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相关PDF资料
CAT4240AEVB
BOARD EVALUATION DPP CAT4240A
CB1A-R-WM-12V
RELAY AUTOMOTIVE SPST 40A 12V
CB3127-000
D-1744-03-LF
CB5065-000
HEAT SHRINK TUBING
CB5143-000
HEAT SHRINK TUBING
CB5440-000
HEAT SHRINK TUBING
CBA-NF-NM1
CABLE ASSY N MALE-N FEM 1000MM
CBA-NM-NM1
CABLE ASSY N MALE-N MALE 1000MM
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