L4978
图3.静态漏电流随输入
电压。
Iq
(MA )
200KHz
R
1
=22K
C
2
=1.2nF
100KHz
R
1
=20K
C
2
=2.7nF
D97IN724
图4.静态电流与结
温度
Iq
(MA )
5
D97IN731
5
200KHz
R
1
=22K
C
2
=1.2nF
100KHz
R
1
=20K
C
2
=2.7nF
0Hz
4
4
3
0Hz
3
V
CC
=35V
0 % DC
2
Tamb=25°C
0 % DC
2
1
0
5 10 15 20 25 30 35 40 45 50
工作电压(V )
1
-50 -30 -10 10 30 50 70 90 110 TJ ( ° C)
图5.待机漏电流与输入
电压
IBIAS
(µA)
150
140
130
120
110
100
90
80
70
60
Tj=125°C
VSS = GND
Tj=25°C
D97IN732
图6.线路调整
V
O
(V)
3.377
Tj=125°C
D97IN733
3.376
3.375
Tj=25°C
3.374
3.373
3.372
3.371
3.370
0 5 10 15 20 25 30 35 40 45 50 V
CC
(V)
0
5 10 15 20 25 30 35 40 45 50 V
CC
(V)
图7.负载调节
V
O
(V)
3.378
3.376
D98IN835
图8.切换frquency与R1和C2
FSW
(千赫)
500
0.8
D97IN784
V
CC
=35V
Tamb=25°C
3.374
3.372
3.370
3.368
3.366
3.364
3.362
3.360
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 I
O
(A)
Tj=125°C
Tj=25°C
200
100
50
20
2nF
1.2
nF
2.2
nF
3.3n
F
4.7n
5.6n
F
F
10
5
0
20
40
60
80
R1(KΩ)
6/12