參數(shù)資料
型號: T1074HV
廠商: Linear Technology Corporation
英文描述: BOX EXTRUD ALUM 8.66X6.30X1.20,1
中文描述: 降壓型開關穩(wěn)壓器
文件頁數(shù): 13/16頁
文件大?。?/td> 215K
代理商: T1074HV
LT1074/LT1076
13
Tapped-Inductor Buck Converter
Positive-to-Negative Converter with 5V Output
TYPICAL APPLICATIO S
+
+
V
SW
V
IN
V
C
GND
FB
LT1074HV
R1
2.8k
R2
2.21k
D2
35V
5W
C3
200
μ
F
50V
R3
1k
C2
0.2
μ
F
L1*
LT1074 TA02
D1**
D3
1N5819
3
1
C1
4400
μ
F
(2 EA
2200
μ
F,
16V)
L2
5
μ
H
C4
390
μ
F
16V
0.01
μ
F
+
PULSE ENGINEERING #PE
±
65282
MOTOROLA MBR2030CTL
IF INPUT VOLTAGE IS BELOW 20V,
MAXIMUM OUTPUT CURRENT WILL BE REDUCED. SEE AN44
*
**
V
IN
20V
TO 35V
V
5V, 10A
R3*
2.74k
V
IN
V
SW
V
GND
R4
1.82k*
C2
1000
μ
F
10V
L1
25
μ
H
5A
+
+
D1
MBR745
R1**
5.1k
V
C
C3
0.1
μ
F
C4**
0.01
μ
F
+
R2**
10k
C1
220
μ
F
50V
* = 1% FILM RESISTORS
D1 = MOTOROLA-MBR745
C1 = NICHICON-UPL1C221MRH6
C2 = NICHICON-UPL1A102MRH6
L1 = COILTRONICS-CTX25-5-52
V
4.5V to
40V
IN
–5V,1A***
+
200
μ
F
10V
OPTIONAL FILTER
5
μ
H
LOWER REVERSE VOLTAGE RATING MAY BE USED FOR LOWER INPUT VOLTAGES.
LOWER CURRENT RATING IS ALLOWED FOR LOWER OUTPUT CURRENT. SEE AN44.
R1, R2, AND C4 ARE USED FOR LOOP FREQUENCY COMPENSATION WITH LOW INPUT VOLTAGE,
BUT R1 AND R2 MUST BE INCLUDED IN THE CALCULATION FOR OUTPUT VOLTAGE DIVIDER VALUES.
FOR HIGHER OUTPUT VOLTAGES, INCREASE R1, R2, AND R3 PROPORTIONATELY.
FOR INPUT VOLTAGE > 10V, R1, R2, AND C4 CAN BE ELIMINATED, AND COMPENSATION IS
DONE TOTALLY ON THE V PIN.
LOWER CURRENT RATING MAY BE USED FOR LOWER OUTPUT CURRENT. SEE AN44.
R3 =V
)
R1 = (R3) (1.86)
R2 = (R3) (3.65)
OUT
MAXIMUM OUTPUT CURRENT OF 1A IS DETERMINED BY MINIMUM INPUT
VOLTAGE OF 4.5V. HIGHER MINIMUM INPUT VOLTAGE WILL ALLOW MUCH HIGHER
OUTPUT CURRENTS. SEE AN44.
LT1074 TA03
LT1074
FB
**
**
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