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LT1572CS Datasheet(PDF) 5 Page - Linear Technology

No. de pieza LT1572CS
Descripción Electrónicos  100kHz, 1.25A Switching Regulator with Catch Diode
PDF  12 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LT1572CS Datasheet(HTML) 5 Page - Linear Technology

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5
LT1572
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
Supply Current vs Input Voltage*
Feedback Pin Clamp Voltage
Idle Supply Current
vs Temperature
Shutdown Mode Supply Current
Error Amplifier Transconductance
VC Pin Characteristics
Supply Current vs Supply Voltage
(Shutdown Mode)
Driver Current* vs Switch Current
SUPPLY VOLTAGE (V)
0
10
20
30
40
160
140
120
100
80
60
40
20
0
1572 G07
VC = 50mV
TJ = 25°C
VC = 0V
SWITCH CURRENT (A)
0
0.25
0.50
0.75
40
35
30
25
20
15
10
5
0
1.00
1.25
1572 G08
TJ = –55°C
TJ = ≥ 25°C
* AVERAGE POWER SUPPLY CURRENT IS
FOUND BY MULTIPLYING DRIVER CURRENT BY
DUTY CYCLE, THEN ADDING QUIESCENT CURRENT.
INPUT VOLTAGE (V)
0
10
20
30
40
1572 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.
VC PIN VOLTAGE (mV)
0
200
180
160
140
120
100
80
60
40
20
0
40
1572 G10
10
20 30
50 60 70 80 90 100
TJ = 150°C
–55
°C ≤ TJ ≤ 125°C
TEMPERATURE (
°C)
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
1572 G11
–75
–25
25
50
150
–50
0
75 100 125
gm =
∆I (VC PIN)
∆V (FB PIN)
VC PIN VOLTAGE (V)
300
200
100
0
–100
–200
–300
–400
1572 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
TEMPERATURE (
°C)
11
10
9
8
7
6
5
4
3
2
1
1572 G13
–75
–25
25
50
150
–50
0
75 100 125
VSUPPLY = 60V
VSUPPLY = 3V
VC = 0.6V
FEEDBACK CURRENT (mA)
0
500
450
400
350
300
250
200
150
100
50
0
0.4
1572 G14
0.1 0.2 0.3
0.5 0.6 0.7 0.8 0.9 1.0
–55
°C
25
°C
150
°C
SWITCH VOLTAGE (V)
0
1000
900
800
700
600
500
400
300
200
100
0
40
1572 G15
10
20 30
50 60 70 80 90 100
VSUPPLY
= 3V
VSUPPLY
= 15V
VSUPPLY
= 40V
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