LT1952 Linear Technology, LT1952 Datasheet - Page 5

• Manufacturer Part Number: LT1952
• Description: Single Switch Synchronous Forward Controller
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
1.23
1.20
1.25
1.24
1.22
1.21
600
550
500
450
400
350
300
250
200
15
10
5
0
–50
–50
–50
V
Temperature
SD_V
Temperature
FB Voltage vs Temperature
SD_V
IN
–25
Start-up Current vs
–25
–25
SEC
SEC
= 1.4V
Pin Current vs
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
0µA PIN CURRENT AFTER
PART TURN ON
PIN CURRENT BEFORE
PART TURN ON
25
25
25
50
50
50
75
75
75
W
100
100
100
1952 G01
1952 G04
1952 G07
U
125
125
125
200
245
230
215
185
170
155
5.0
3.5
6.5
6.0
5.5
4.5
4.0
18
16
14
12
10
8
6
–50
–50
–50
V
V
Temperature
Switching Frequency vs
Temperature
OC = OPEN
IN
IN
–25
–25
I
–25
Turn ON/OFF Voltage vs
Q
vs Temperature
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
V
IN
V
25
25
25
IN
TURN OFF VOLTAGE
TURN ON VOLTAGE
50
50
50
75
75
75
100
100
100
1952 G08
1952 G02
1952 G05
125
125
125
1.32
1.22
1.42
1.37
1.27
250
100
500
450
400
350
300
200
150
0.6
1.6
1.4
1.2
1.0
0.8
0.4
0.2
0
–50
–50
–50
SD_V
Temperature
COMP Active Threshold vs
Temperature
V
Temperature
R
V
SD_V
IN
ISENSE
IN
–25
–25
–25
= 15V
Shutdown Current vs
SEC
SEC
= 0k
= 0V
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Turn ON Threshold vs
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
25
50
50
50
LT1952
75
75
75
100
100
100
1952 G03
1952 G06
1952 G09
5
1952f
125
125
125