LT1952-1_15 Datasheet, PDF (6/28 Pages) Linear Technology – Single Switch Synchronous Forward Controller

LT1952/LT1952-1
TYPICAL PERFORMANCE CHARACTERISTICS
FB Voltage vs Temperature
1.25
1.24
1.23
1.22
1.21
1.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1952 G01
V_IN Start-up Current
vs Temperature
600 _{SD_VSEC = 1.4V}
550
500
LT1952
450
400
350
LT1952-1
300
250
200
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1952 G04
SD_V_SEC Pin Current
vs Temperature
15
PIN CURRENT BEFORE
PART TURN ON
10
5
0
–50 –25
0mA PIN CURRENT AFTER
PART TURN ON
0 25 50 75 100 125
TEMPERATURE (°C)
1952 G07
6
Switching Frequency
vs Temperature
245
230
215
200
185
170
155
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1952 G02
V_IN I_Q vs Temperature
6.5
OC = OPEN
6.0
5.5
5.0
4.5
4.0
3.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1952 G05
V_IN Turn ON/OFF Voltage
vs Temperature
18
16
LT1952 V_IN TURN ON VOLTAGE
14
12
10
LT1952 V_IN TURN OFF VOLTAGE
8
LT1952-1 V_IN ON LT1952-1 V_IN OFF
6
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
1952 G08
V_IN Shutdown Current
vs Temperature
500
V_IN = 15V
450 ^{SD_VSEC = 0V}
400
350
300
250
200
150
100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1952 G03
SD_V_SEC Turn ON Threshold
vs Temperature
1.42
1.37
1.32
1.27
1.22
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1952 G06
COMP Active Threshold
vs Temperature
1.6
R_ISENSE = 0k
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1952 G09
19521fe