ꢀ Characteristic Curve
PD –Ta (AN7900T Series)
PD –Ta (AN7900F Series)
VDIF (min.) –Tj
16
16
14
12
10
8
1.4
1.2
1.0
0.8
0.6
0.4
(1) Infinite Heat Sink
(1) Infinite Heat Sink
(2) 5˚C/W Heat Sink
(3) 15˚C/W Heat Sink
(4) No Heat Sink
(2) 5˚C/W Heat Sink
(3) 15˚C/W Heat Sink
(4) No Heat Sink
(1)
(2)
14
12
10
8
(1)
(2)
IO=1000mA
6
6
(3)
(4)
(3)
(4)
4
4
2
2
0
0
0
40
80
120
160
0
40
80
120
160
–50
0
50
100
150
Ambient Temperature Ta (˚C)
Ambient Temperature Ta (˚C)
Junction Temperature Tj (˚C)
Input Transient Response
Load Transient Response
RR– f
20
15
10
5
120
100
80
60
40
20
0
AN7905T/F
AN7905T/F
AN7905T/F
IO=100mA
2
1
0
1
0
10
0
–1
–2
–10
–20
0
2
4
6
8
10
0
10
20
30
40
50
10
100
1k
10k
100k
Frequency f (Hz)
Time t (µs)
Time t (µs)
ꢀ Basic Regulator Circuit
ꢀ Application Circuit
1) Current Bootstrap Circuit
2) Adjustable Output Regulator
Input
Output
–VI
Q1
2
3
–VO
–VI
2
3
AN7900T
AN7900T
6Ω
–
AN7900F
–
IO
CI
AN7900F
CO
VO´
R2
1
+
+
1
2
–VO
3
–
–
Common
AN7900T
AN7900F
1µF
2µF
+
+
–
–
Ibias
1µF
1
2µF
+
+
R1
CI : Required when the input line is long
CO : Improves the transient response.
VO´
R2
|VO| =VO´ + Ibias
+
R1
8
PANASONIC [ PANASONIC ]
