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LT3430 Datasheet(PDF) 4 Page - Linear Technology

Part # LT3430
Description  High Voltage, 3A, 200kHz Step-Down Switching Regulator
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3430 Datasheet(HTML) 4 Page - Linear Technology

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4
LT3430
sn3430 3430is
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Peak Current Limit
DUTY CYCLE (%)
6
5
4
3
2
20
40
60
80
3430 G01
100
0
GUARANTEED MINIMUM
TJ = 25°C
TYPICAL
Lockout and Shutdown
Thresholds
FB Pin Voltage and Current
SHDN Pin Bias Current
JUNCTION TEMPERATURE (
°C)
–50
1.224
1.229
1.234
25
75
3430 G02
1.219
1.214
–25
0
50
100
125
1.209
1.204
1.5
2.0
1.0
0.5
0
VOLTAGE
CURRENT
JUNCTION TEMPERATURE (
°C)
–50
250
200
150
100
12
6
0
25
75
3430 G03
–25
0
50
100
125
CURRENT REQUIRED TO FORCE SHUTDOWN
(FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW
µA
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
JUNCTION TEMPERATURE (
°C)
–50
50
100
3430 G04
0
25
75
2.4
2.0
1.6
1.2
0.8
0.4
0
–25
125
LOCKOUT
START-UP
SHUTDOWN
Shutdown Supply Current
Shutdown Supply Current
Error Amplifier Transconductance
INPUT VOLTAGE (V)
0
3430 G05
10
20
30
40
50
60
40
35
30
25
20
15
10
5
0
VSHDN = 0V
SHUTDOWN VOLTAGE (V)
0
0
50
100
150
200
250
300
0.1
0.2
0.3
0.4
3430 G06
0.5
VIN = 60V
VIN = 15V
JUNCTION TEMPERATURE (
°C)
3430 G07
2500
2000
1500
1000
500
0
–50
50
100
0
25
75
–25
125
Error Amplifier Transconductance
Frequency Foldback
FREQUENCY (Hz)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100
10k
100k
10M
3430 G08
1k
1M
GAIN
PHASE
ERROR AMPLIFIER EQUIVALENT CIRCUIT
ROUT
200k
COUT
12pF
VC
RLOAD = 50Ω
VFB 2 • 10
–3
)
(
VFB (V)
0
300
400
600
500
3430 G09
200
100
0
0.5
1.0
1.5
SWITCHING
FREQUENCY
FB PIN
CURRENT



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