LT1431 Просмотр технического описания (PDF) - Linear Technology
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LT1431 Datasheet PDF : 14 Pages
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LT1431
Typical Applications
5V Power Supply Monitor with ± 500mV
Window and 50mV Hysteresis
1k
V+
COLL
REF
LT1431
GND-S
GND-F
10Ω**
6k*
1k
1N4148
V+
COLL
REF
LT1431
5k
GND-S
GND-F
4k*
“HIGH” FOR
OVER VOLTAGE OR
UNDER VOLTAGE
5k
10Ω**
*DETERMINES WINDOW SIZE
V = (R – 5k)(0.5mA)
**SETS HYSTERESIS
LT1431 TA13
Transfer Function
6
5
4
3
2
1
0
0
1
2
3
4
VIN
5
6
LT1431 TA14
1
VIN
+
High Efficiency Buck Converter E = 85% to 89%
C1
220µF
35V
D1
BAT85
R1
470k
5
VIN
4
VSW
LT1170 2
FB
GND VC
3
1
C5
0.047µF
BOLD LINES INDICATE HIGH CURRENT PATHS
*1% FILM RESISTORS
C1: NICHICON UPL1V221MPH
C3, C4, C5: WIMA MKS-2
C6: NICHICON UPL1C471MPH6
D1, D2: PHILIPS BAT85
D3: MOTOROLA MBR330
L1: COILTRONICS CTX50-3-MP
+ C2
4.7µF
35V
TANT
D4
BAT85
R2
1k
C3
0.1µF
C4
0.033µF
D3
L1
0.12Ω
MBR330 50µH 3A ESR
D2
BAT85
1
OFF
RUN = 0
SHUTDOWN > 3V
R3
10k
Q2
2N3904
Q1
VN2222LL
Q3
2N3904
R4
100Ω
R5
680Ω
R8*
24.9k
2
1
3
COMP
V+
COLL 8
REF
4
LT1431CN8
7
RTOP
RMID
GND-S
GND-F
5
6
2
RTN
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTANCES ARE IN Ω, 0.25W, 5%
2. ALL CAPACITANCES ARE IN µF, 50V, 10%
3. SHUTDOWN LOGIC STATE MUST BE DEFINED BY A LOGIC GATE OR BY TYING TO GND
C6
470µF
16V
5V
2.5A
R6*
23.7k
R7*
24.9k
1431 TA15
1431fd
10
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