Samsung SR-606EV, Service Manual

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60 Samsung Electronics
2) REGULATOR(MC7812C)
ELECTRICAL CHARACTERISTICS MC7812
(Refer to test circuit, T
min
< T
i
< T
max,
V
i
= 500mA, V
i
= 19V, C
i
= 0.33µF, C
o
= 1.0µFunless otherwise specified)
* T
min
< T
i
< T
max
MC78XXI : T
min
= -40°C, T
max
= 125C
MC78XXC, T
min
= 0°C, T
max
= 125°C
* Load and line regulation are specified at constant junction temperature. Changes in V
o
due to heating effects must be taken into
account separately. Pulse testint with low duty is used.
Characteristic
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Boltage
Ripple
Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Min
11.5
11.4
55
Typ
12
12
10
3.0
12
4.0
5.1
-1
75
71
2
18
250
2.2
Max
12.5
12.6
240
120
240
120
8
0.5
1.0
Unit
V
mV
mV
mA
mA
mV/°C
µ/V
dB
V
m
Ω
mA
A
Test Conditions
Ti = 25°C
5.0mA
≤
I
o
≤
1.0A, P
≤
15W
V
in
= 14.5V to 27V
V
i
= 15.5V to 27V
V
i
= 14.5V to 30V
V
i
= 16V to 22V
I
o
= 5.0mA to 1.5V
I
o
= 250mA to 750mA
T
i
= 25°C
Io = 5mA to 1.0A
V
i
= 14.5V to 30V
V
i
= 15V to 30V
I
o
= 5mA
f = 10Hz to 100KHz T
i
= 25°C
fF = 120Hz
V
i
= 15 to 25V
I
o
= 1A, T
i
= 25°C
f = 1KHz
V
i
= 35V, T
i
= 25°C
T
i
= 25°C
Symbol
V
o
∆
V
o
∆
V
o
I
d
∆
I
d
∆
V
o
/
∆
T
V
n
RR
V
D
R
O
I
SC
I
peak
MC7805C
Ti = 25°C
Ti = 25°C