LT1425 Linear Technology, LT1425 Datasheet - Page 4

• Manufacturer Part Number: LT1425
• Description: Isolated Flyback Switching Regulator
• Manufacturer: Linear Technology

LT1425
TYPICAL PERFORMANCE CHARACTERISTICS
4
–20
–40
–60
–80
300
295
290
285
280
275
270
265
300
275
250
225
200
175
150
125
60
40
20
0
1.05
–50
–50
Feedback Amplifier Output
Current vs R
Switching Frequency vs
Temperature
Minimum Switch ON Time vs
Temperature
1.10
–25
–25
1.15
R
REF
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
NODE VOLTAGE (V)
REF
1.20
25
25
Pin Voltage
1.25
50
50
1.30
75
75
W
25 C
125 C
–55 C
1.35 1.40
100
100
1425 G04
1425 G07
1425 G10
U
125
125
1400
1200
1000
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
250
800
600
400
200
225
200
175
150
125
100
75
0
–50
–50
–50
Error Amplifier Transconductance
vs Temperature (R
Minimum Synchronization
Voltage vs Temperature
Flyback Enable Delay Time vs
Temperature
–25
–25
–25
0
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
25
REF
50
50
50
Referred)
75
75
75
100
100
100
1425 G05
1425 G08
1425 G11
125
125
125
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
275
250
225
200
175
150
125
100
–1
–2
–3
–4
1
0
–50
–50
0
V
Voltage vs Temperature
SHDN Pin Input Current vs
Voltage
Minimum Flyback Enable Time vs
Temperature
C
T
A
Pin Threshold and High Clamp
–25
–25
= 25 C
1
SHDN PIN VOLTAGE (V)
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
V
V
2
25
25
C
C
HIGH CLAMP
THRESHOLD
50
50
3
75
75
4
100
100
1425 G06
1425 G12
1425 G09
125
125
5