參數(shù)資料
型號(hào)： 13745
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 8/32頁(yè)
文件大?。?/td> 309K
代理商： 13745
8
LT1374
1374fb
–
+
–
+
–
+
–
+
Σ
INPUT
2.9V BIAS
REGULATOR
500kHz
OSCILLATOR
FREQUENCY
SHIFT CIRCUIT
V
SW
FB
V
C
LOCKOUT
COMPARATOR
GND
1374 BD
SLOPE COMP
0.01
BIAS*
INTERNAL
V
CC
CURRENT
SENSE
AMPLIFIER
VOLTAGE GAIN = 20
SYNC
SHDN
SHUTDOWN
COMPARATOR
CURRENT
COMPARATOR
ERROR
AMPLIFIER
g
m
= 2000
μ
Mho
FOLDBACK
CURRENT
LIMIT
CLAMP
BOOST
R
FLIP-FLOP
DRIVER
CIRCUITRY
S
R
0.9V
Q2
Q1
POWER
SWITCH
2.42V
2.38V
*BIAS PIN IS AVAILABLE ONLY ON THE S0-8 AND FE16 PACKAGES
–
+
0.4V
3.5
μ
A
BLOCK DIAGRA
APPLICATIOU
FEEDBACK PIN FUNCTIONS
The feedback (FB) pin on the LT1374 is used to set output
voltage and provide several overload protection features.
The first part of this section deals with selecting resistors
to set output voltage and the remaining part talks about
foldback frequency and current limiting created by the FB
pin. Please read both parts before committing to a final
design. The fixed 5V LT1374-5 has internal divider resis-
tors and the FB pin is renamed SENSE, connected directly
to the output.
The suggested value for the output divider resistor (see
Figure 2) from FB to ground (R2) is 5k or less, and a
formula for R1 is shown below. The output voltage error
caused by ignoring the input bias current on the FB pin is
less than 0.25% with R2 = 5k. A table of standard 1%
values is shown in Table 1 for common output voltages.
W
U
U
Please read the following if divider resistors are increased
above the suggested values.
(
R
R V
OUT
2
1
2 42
2 42
=
)
Table 1
OUTPUT
VOLTAGE
(V)
R1
% ERROR AT OUTPUT
DUE TO DISCREET 1%
RESISTOR STEPS
+0.23
+0.08
+0.39
–0.5
–0.04
+0.83
–0.62
+0.52
R2
(k
)
4.99
4.99
4.99
4.99
4.99
4.99
4.99
4.99
(NEAREST 1%)
(k
)
1.21
1.82
5.36
7.32
11.5
15.8
19.6
26.1
3
3.3
5
6
8
10
12
15
Figure 1. Block Diagram
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