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LT1172M 数据表(PDF) 5 Page - Linear Technology

部件名 LT1172M
功能描述  100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1172M 数据表(HTML) 5 Page - Linear Technology

  LT1172M Datasheet HTML 1Page - Linear Technology LT1172M Datasheet HTML 2Page - Linear Technology LT1172M Datasheet HTML 3Page - Linear Technology LT1172M Datasheet HTML 4Page - Linear Technology LT1172M Datasheet HTML 5Page - Linear Technology LT1172M Datasheet HTML 6Page - Linear Technology LT1172M Datasheet HTML 7Page - Linear Technology LT1172M Datasheet HTML 8Page - Linear Technology LT1172M Datasheet HTML 9Page - Linear Technology Next Button
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5
LT1170/LT1171/LT1172
INPUT VOLTAGE (V)
0
10
20
30
40
1170/1/2 G09
50
15
14
13
12
11
10
9
8
7
6
5
60
TJ = 25°C
NOTE THAT THIS CURRENT DOES NOT
INCLUDE DRIVER CURRENT, WHICH IS
A FUNCTION OF LOAD CURRENT AND
DUTY CYCLE.
90% DUTY CYCLE
50% DUTY CYCLE
10% DUTY CYCLE
0% DUTY CYCLE
* UNDER VERY LOW OUTPUT CURRENT CONDITIONS,
DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH
10% OR LESS.
Supply Current vs Input Voltage*
VC PIN VOLTAGE (mV)
0
200
180
160
140
120
100
80
60
40
20
0
40
1170/1/2 G10
10
20 30
50 60 70 80 90 100
TJ = 150°C
–55
°C ≤ TJ ≤ 125°C
Shutdown Mode Supply Current
TEMPERATURE (
°C)
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
1170/1/2 G11
–75
–25
25
50
150
–50
0
75 100 125
gm =
∆I (VC PIN)
∆V (FB PIN)
Error Amplifier Transconductance
VC Pin Characteristics
SUPPLY VOLTAGE (V)
0
10
20
30
40
160
140
120
100
80
60
40
20
0
50
60
1170/1/2 G07
VC = 50mV
VC = 0V
TJ = 25°C
Supply Current vs Supply Voltage
(Shutdown Mode)
Driver Current* vs Switch Current
SWITCH CURRENT (A)
0
12
3
160
140
120
100
80
60
40
20
0
4
5
1170/1/2 G08
TJ = –55°C
TJ = ≥ 25°C
* AVERAGE LT1170 POWER SUPPLY CURRENT IS
FOUND BY MULTIPLYING DRIVER CURRENT BY
DUTY CYCLE, THEN ADDING QUIESCENT CURRENT.
VC PIN VOLTAGE (V)
300
200
100
0
–100
–200
–300
–400
1170/1/2 G12
0
2.0
0.5
1.0
1.5
2.5
VFB = 1.5V (CURRENT INTO VC PIN)
VFB = 0.8V (CURRENT OUT OF VC PIN)
TJ = 25°C
Reference Voltage vs Temperature
INPUT VOLTAGE (V)
0
10
20
30
40
1170/1/2 G04
50
5
4
3
2
1
0
–1
–2
–3
–4
–5
60
TJ = 150°C
TJ = –55°C
TJ = 25°C
Line Regulation
TEMPERATURE (
°C)
1170/1/2 G05
1.250
1.248
1.246
1.244
1.242
1.240
1.238
1.236
1.234
–75
–25
25
50
150
–50
0
75 100 125
TEMPERATURE (
°C)
1170/1/2 G06
800
700
600
500
400
300
200
100
0
–75
–25
25
50
150
–50
0
75 100 125
Feedback Bias Current vs
Temperature
TYPICAL PERFOR A CE CHARACTERISTICS


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类似说明 - LT1172M

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