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LT1370HV Datasheet(PDF) 10 Page - Linear Technology

No. de pieza LT1370HV
Descripción Electrónicos  Available in MiniDiP, TO-220, and TO-3 Packages
PDF  16 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LT1370HV Datasheet(HTML) 10 Page - Linear Technology

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10
LT1072
1072fc
Flyback Converter
Negative to Positive Buck-Boost Converter
External Current Limit
R1
1k
VIN
NOTE THAT THE LT1072 GND PIN
IS NO LONGER COMMON TO VIN (–)
LT1072 • TA06
C1
1000pF
C2
RS
R2
+
–
VIN
VSW
FB
VC
GND
LT1072
Q1
C3
0.47µF
VOUT
5V
1.5A
D2
D1
OPTIONAL
FILTER
1
1
3
N*
N* =
C2
0.15µF
C4
25µF*
VIN
20 TO 30V
R3
1.5k
REQUIRED IF INPUT LEADS ≥ 2"
OPTIONAL TO REPLACE R4 AND C3
*
**
C1
500µF
R4
1k
**
R1
3.74k
R2
1.24k
VIN
VSW
FB
VC
GND
LT1072
L2
10µH
C4
200µF
VSNUB
VOUT + Vf
IPRI
IPRI
IPRI
(IPRI) (LL)
VSNUB
IPRI
N
∆I
VIN
0V
0V
0
0
0
0
CLAMP TURN-ON
SPIKE
PRIMARY FLYBACK VOLTAGE =
LT1072 SWITCH VOLTAGE
AREA “a” = AREA “b” TO MAINTAIN
ZERO DC VOLTS ACROSS PRIMARY
SECONDARY VOLTAGE
AREA “c” = AREA “d” TO MAINTAIN
ZERO DC VOLTS ACROSS SECONDARY
PRIMARY CURRENT
SECONDARY CURRENT
LT1070 SWITCH CURRENT
SNUBBER DIODE CURRENT
VOUT + Vf
N
N • VIN
t =
a
b
c
d
LT1072 • TA04
+
+
VIN
VSW
FB
VC
GND
LT1072
C2
1000µF
C1
0.22µF
C4
25µF*
R2
1.24k
R3
2.2k
R1
11.3k
VOUT
12V, 0.5A
VIN
–12V
D1
L1**
220µH
Q1
*
**
REQUIRED IF INPUT LEADS ≥ 2"
PULSE ENGINEERING 52626
OPTIONAL
INPUT
FILTER
L3
OPTIONAL
OUTPUT
FILTER
L2
C3
LT1072 • TA05
+
+
TYPICAL APPLICATIO S



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