LT1977
TYPICAL PERFOR A CE CHARACTERISTICS
FB Voltage
1.30
1.29
1.28
FREQUENCY (kHz)
1.27
VOLTAGE (V)
1.26
1.25
1.24
1.23
1.22
1.21
1.20
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
510
500
490
480
470
460
450
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
VOLTAGE (V)
SHDN Pin Current
5.5
5.0
4.5
4.0
CURRENT (µA)
T
J
= 25°C
CURRENT (µA)
3.5
3.0
2.5
2.0
1.5
1.0
0
0
10
30
40
20
SHDN VOLTAGE (V)
50
60
1977 G04
15
CURRENT (µA)
Bias Sleep Current
200
180
160
140
1.20
1.18
1.16
1.14
1.12
1.10
1.08
1.06
1.04
1.02
50
25
0
75
TEMPERATURE (°C)
100
125
CURRENT (µA)
120
100
80
60
40
20
0
–50 –25
CURRENT (µA)
VOLTAGE (V)
4
U W
1977 G01
1977 G07
Oscillator Frequency
550
540
530
520
SHDN Threshold
1.40
1.35
1.30
1.25
1.20
0.15
1.10
1.05
1.00
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1977 G02
1977 G03
Shutdown Supply Current
25
200
180
20
V
IN
= 60V
160
140
120
100
80
60
5
V
IN
= 42V
0
–50 –25
V
IN
= 12V
100
125
40
20
Sleep Mode Supply Current
V
BIAS
= 0V
10
V
BIAS
= 5V
50
25
0
75
TEMPERATURE (°C)
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1977 G05
1977 G06
PGFB Threshold
250
PG Sink Current
200
150
100
50
1.00
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1977 G08
1977 G09
1977f
LINER [ LINEAR TECHNOLOGY ]
