參數(shù)資料
型號(hào): LT1071
廠商: Linear Technology Corporation
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述: 射頻放大器
文件頁數(shù): 6/12頁
文件大?。?/td> 265K
代理商: LT1071
6
LT1070/LT1071
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
voltage is obtained by using the output of a voltage
sensing error amplifier to set current trip level. This
technique has several advantages. First, it has immediate
response to input voltage variations, unlike ordinary
switchers which have notoriously poor line transient
response. Second, it reduces the 90
°
phase shift at
The LT1070/LT1071 is a current mode switcher. This
means that switch duty cycle is directly controlled by
switch current rather than by output voltage. Referring to
the Block Diagram, the switch is turned “on” at the start
of each oscillator cycle. It is turned “off” when switch
current reaches a predetermined level. Control of output
OPERATIO
U
Switch “Off” Characteristics
SWITCH VOLTAGE (V)
0
S
μ
A
600
800
1000
80
1070/71 G19
400
200
500
700
900
300
100
0
20
40
60
10
90
30
50
70
100
V
SUPPLY
=
3V
15V
40V
55V
FREQUENCY (Hz)
1000
T
μ
m
P
°
)
3000
4000
6000
7000
1k
100k
1M
10M
1070/71 G21
–1000
10k
5000
2000
0
150
90
θ
60
0
–30
210
30
120
180
g
m
Transconductance of Error
Amplifier
V
C
Pin Characteristics
V
C
PIN VOLTAGE (V)
0
–400
V
C
μ
A
–300
–200
–100
300
100
0.5
1.0
200
0
1.5
2.0
2.5
1070/71 G20
V
= 1.5V
(CURRENT INTO
V
C
PIN)
V
= 0.8V
(CURRENT OUT OF V
C
PIN)
T
J
= 25
°
C
BLOCK DIAGRA
M
W
+
+
ERROR
AMP
CURRENT
AMP
0.02
(0.04
LT1071)
SHUTDOWN
CIRCUIT
MODE
SELECT
40kHz
OSC
LOGIC
DRIVER
ANTISAT
16V
5A, 75V
SWITCH
V
IN
FB
V
C
COMP
GAIN
6
0.15V
1070/71 BD
1.24V
REF
2.3V
REG
FLYBACK
ERROR
AMP
SWITCH
OUT
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