LT1576CS8-SYNC Просмотр технического описания (PDF) - Linear Technology
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LT1576CS8-SYNC Datasheet PDF : 28 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LT1576/LT1576-5
Shutdown Supply Current
100
75
VIN = 25V
VIN = 10V
50
25
0
0
0.1
0.2
0.3
0.4
SHUTDOWN VOLTAGE (V)
1576 G10
Switching Frequency
240
220
Error Amplifier Transconductance
1600
1400
1200
1000
800
600
400
200
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G11
Minimum Input Voltage
at VOUT = 5V
7
VOUT = 5V
MINIMUM
STARTING VOLTAGE
200
6
MINIMUM
RUNNING VOLTAGE
180
Frequency Foldback
250
SWITCHING FREQUENCY
200
150
100
50
FEEDBACK PIN CURRENT
0
0
0.5
1.0
1.5
2.0
FEEDBACK VOLTAGE (V)
1576 G12
Maximum Load Current
at VOUT = 10V
1.50
VOUT = 10V
L = 60µH
1.25
L = 30µH
1.00
L = 15µH
0.75
0.50
0.25
160
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G13
Maximum Load Current
at VOUT = 5V
1.50
L = 60µH
1.25
L = 30µH
1.00
L = 15µH
0.75
0.50
0.25
VOUT = 5V
0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1576 G16
5
0
1
10
100
1000
0
5
10
15
20
25
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
1576 G14
1576 G15
Maximum Load Current
at VOUT = 3.3V
1.50
1.25
L = 60µH
L = 30µH
1.00
L = 15µH
0.75
0.50
0.25
VOUT = 3.3V
0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1576 G17
Inductor Core Loss
1.0
20
VOUT = 5V, VIN = 10V, IOUT = 1A
12
8
TYPE 52
4
0.1
POWDERED IRON 2
Kool Mµ®
1.2
0.8
PERMALLOY
0.01
CORE LOSS IS
µ = 125
INDEPENDENT OF LOAD
CURRENT UNTIL LOAD CURRENT FALLS
LOW ENOUGH FOR CIRCUIT TO GO INTO
DISCONTINUOUS MODE
0.001
0
5
10
15
20
INDUCTANCE (µH)
0.4
0.2
0.12
0.08
0.04
0.02
25
1576 G18
Kool Mµ is a registered trademark of Magnetics, Inc.
5
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