LT3430 Linear Technology, LT3430 Datasheet - Page 4

• Manufacturer Part Number: LT3430
• Description: High Voltage/ 3A/ 200kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

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