s
Characteristic Curve
P
D
–Ta (AN7900T Series)
16
14
(1)
(1) Infinite Heat Sink
(2) 5˚C/W Heat Sink
(3) 15˚C/W Heat Sink
(4) No Heat Sink
P
D
–Ta (AN7900F Series)
16
14
(1) Infinite Heat Sink
(2) 5˚C/W Heat Sink
(3) 15˚C/W Heat Sink
(4) No Heat Sink
(1)
10
8
6
(3)
4
2
(4)
(2)
V
DIF (min.)
–T
j
Minimum I/O Voltage Difference V
DIF (min.)
(V)
1.4
Power Dissipation P
D
(W)
12
(2)
10
8
6
(3)
4
2
(4)
0
0
40
80
120
160
Power Dissipation P
D
(W)
1.2
I
O
=1000mA
1.0
I
O
=
50
0m
I
O
=
A
20
I
O
=
0mA
20m
A
12
0.8
0.6
0
0.4
–50
0
50
100
150
0
40
80
120
160
Ambient Temperature Ta (˚C)
Ambient Temperature Ta (˚C)
Junction Temperature T
j
(˚C)
Input Transient Response
AN7905T/F
15
Load Transient Response
Input Voltage V
I
(V)
Output Voltage Fluctuation (V)
20
RR– f
Load Current I
O
(A)
120
AN7905T/F
I
O
=100mA
2
AN7905T/F
Ripple Rejection Ratio RR (dB)
100
1
10
80
Output Voltage Fluctuation (mV)
0
1
5
10
60
0
0
40
–10
–1
20
–20
0
2
4
6
8
10
–2
0
0
10
20
30
40
50
10
100
1k
10k
100k
Time t (µs)
Time t (µs)
Frequency f (Hz)
s
Basic Regulator Circuit
Input
2
–
+
3
–
+
Common
Output
s
Application Circuit
1) Current Bootstrap Circuit
–V
I
Q
1
6Ω
2
–
2µF
+
3
–
+
2) Adjustable Output Regulator
–V
I
I
O
–V
O
–
1µF
+
2µF
I
bias
R
1
–
+
1µF
–V
O
C
I
AN7900T
AN7900F
1
2
1
3
V
O
´
R
2
C
O
AN7900T
AN7900F
AN7900T
AN7900F
1
C
I
: Required when the input line is long
C
O
: Improves the transient response.
V
O
´
|V
O
|
=V
O
´ + I
bias
+ R R
1
2
8
PANASONIC [ PANASONIC SEMICONDUCTOR ]
