Texas Instruments LM3431 Evaluation Board LM3431EVAL/NOPB LM3431EVAL/NOPB 사용자 설명서
제품 코드
LM3431EVAL/NOPB
LM3431
VIN
EN
FF
SGND
AFB
VCC
REF
REFIN
SNS1
NDRV3
SNS3
NDRV1
NDRV2
SNS2
LG
CS
PGND
COMP
MODE/F
RT
CFB
THM
SC
SS/SH
DLY
DIM
ILIM
Vin: 8V to 18V
LEDOFF
+
-
REFIN
LEDOFF
VCC
D2-5 3003C
D6-9 1001A
D1 40V 2A
L1
7
P
H 3.1A
Q1
Si4446
C10*
R19
562k
R18
33.2k
R3
51m
:
R4 5.76k
C1
1
P
F
C2
10
P
F
R2
20k
R1
105k
R7 88.7k
R8 13k
R9 909
:
C4 47 nF
R5b
15.8k
C3
4.7
P
F
R6
34.8k
C6
47 nF
C7
4.7 nF
VCC
R10
2.2
:
Q2
2N2222
Q6
2N7002k
LED ARRAY = 4 x 8 @140 mA
R15 1k
VA
VC1
VC2
VC3
VC4
RMODE
0
:
C5
10 nF
THM
R17 95.3k
VCC
Op1
LMV710
THM
External
Thermistor
C11 *
EP
C8,C9
4.7
4.7
P
F
Q3
2N2222
Q4
2N2222
Q5
2N2222
R11
2.2
:
R12
2.2
:
R14
10k
*
= not installed
R16 10k
Rrestart
*
C13 *
+
10 nF
8V to 18V input
700 kHz switching, 180 Hz
±
1 kHz dimming
4 strings of 8 LEDs, 140 mA per string
R13
2.2
:
VCC
R24 *
GND
C14
*
D10 *
C12 *
R5a
0
:
R21 - R23
*
RVCC
*
C16*
DIM
R20 *
EN
R25 0
:
C15
Before Powering Up
Figure 2. Complete LM3431 Eval Board Schematic
3
SNVA309A – January 2008 – Revised May 2013
AN-1764 LM3431 Evaluation Board
Copyright © 2008–2013, Texas Instruments Incorporated