lt3431efe-trpbf Linear Technology Corporation, lt3431efe-trpbf Datasheet - Page 4

• Manufacturer Part Number: lt3431efe-trpbf
• Description: High Voltage, 3a, 500khz Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

LT3431
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
T
Error Amplifier Transconductance
j
= 25 C
–25
–25
20
JUNCTION TEMPERATURE ( C)
JUNCTION TEMPERATURE ( C)
GUARANTEED MINIMUM
0
DUTY CYCLE (%)
0
40
TYPICAL
LOCKOUT
START-UP
SHUTDOWN
25
25
50
60
50
75
W
75
80
100
3431 G01
100
3431 G04
U
3431 G07
100
125
125
3000
2500
2000
1500
1000
1.234
1.229
1.214
1.204
1.224
1.219
1.209
500
100
–50
Error Amplifier Transconductance
40
35
30
25
20
15
10
FB Pin Voltage and Current
ERROR AMPLIFIER EQUIVALENT CIRCUIT
5
0
V
R
FB 2 • 10
LOAD
0
Shutdown Supply Current
–25
V
SHDN
1k
JUNCTION TEMPERATURE ( C)
= 50
10
–3
= 0V
GAIN
0
FREQUENCY (Hz)
PHASE
10k
INPUT VOLTAGE (V)
20
25
CURRENT
VOLTAGE
R
200k
50
OUT
100k
30
75
40
1M
C
12pF
OUT
100
V
3431 G08
3431 G02
C
50
10M
3431 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
625
500
250
125
375
12
50
6
0
0
0
–50
0
0
SHDN Pin Bias Current
Shutdown Supply Current
Frequency Foldback
CURRENT REQUIRED TO FORCE SHUTDOWN
(FLOWS OUT OF PIN). AFTER SHUTDOWN,
–25
AT 2.38V STANDBY THRESHOLD
0.2
(CURRENT FLOWS OUT OF PIN)
0.1
CURRENT DROPS TO A FEW A
JUNCTION TEMPERATURE ( C)
SHUTDOWN VOLTAGE (V)
V
0
IN
0.4
= 60V
0.2
25
V
FB
0.6
(V)
50
V
0.3
IN
FREQUENCY
SWITCHING
= 15V
0.8
75
CURRENT
sn3431 3431fs
FB PIN
0.4
1.0
100
3431 G03
3431 G09
3431 G06
125
1.2
0.5