LT1105_15 Datasheet, PDF (6/32 Pages) Linear Technology – Offline Switching Regulator

LT1103/LT1105
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Supply Current vs
Temperature
22
21
20
30V
19
18
17
16
8V
15
14
13
12
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1103 G04
V_IN Start-Up Threshold vs
Temperature
17.5
17.0
16.5
16.0
15.5
15.0
14.5
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1103 G07
Preset Switch Maximum Duty
Cycle vs Temperature
75
C_OSC = 1000pF
72
69
66
63
60
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1103 G10
Shutdown Supply Current vs
Input Voltage
500
450
400
350
300
250
200
V_C = 75mV
150
100
V_C = 0
50
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
LT1103 G05
V_IN Shutdown Threshold vs
Temperature
8.0
7.7
7.4
7.1
6.8
6.5
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1103 G08
Switch Oscillator Frequency vs
Capacitance
1000
100
10
100
1000
CAPACITANCE (pF)
10000
LT1103 G11
Shutdown Supply Current vs
V_C Voltage
500
450
400
350
300
250
25°C ^125°C
200
150
100
–55°C
50
0
0 20 40 60 80 100 120 140 160 180 200
V_C (mV)
LT1103 G06
Output Switch Frequency vs
Temperature
45
C_OSC = 1000pF
43
41
39
37
35
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1103 G09
Overvoltage Lockout Threshold vs
Temperature
3.0
2.8
2.6
2.4
2.2
2.0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1103 G12
6