STK7562J_ データシートの表示（PDF） - SANYO -> Panasonic
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STK7562J_ Datasheet PDF : 13 Pages
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[OCP]
STK7560 Series
In the actual circuit transistor TR is connected in parallel with resistor R as
shown left. The error signal from the constant-voltage output side is used to
control the base current of TR so that the resistor value is varied equiva-
lently to make the output voltage constant.
When the error signal is large, the base bias of TR is deepend and the
equivalent resistance gets small, narrowing the pulse width to control the
output voltage.
When the error signal is small, the base bias of TR is shallowed, widening
the pulse width to control the output voltage.
Overcurrent protection (OSC) is provided as follows : The voltage drop
across current detect resistor Rs of the external connection circuit is
detected to turn ON transistor TR1. Then, the collector current is
applied to the base of TR2 to make time constant CR small, forcing the
pulse width to be narrow.
The “fold-back” overcurrent characteristic occurs in which the pulse
width is narrowd to drop the output voltage and also to decrease the
output current.
[Cutoff]
The cutoff circuit (remote ON/OFF control) is so designed that the output is turned ON at ‘H’ level of cutoff input.
In the circuit shown below, when the input is at ‘H’ level, TR1 is turned ON to drop the base voltage of TR2 and
TR2 is turned OFF. Since TR2 is independent of the differentiating circuit composed of C and R, the output is
turned ON.
When the input is at ‘L’ level, TR1 is turned OFF to increase the base
voltage of TR2 and TR2 is turned ON. Since TR2 is connected in parallel
with R of the differentiating circuit, R is short-circuited to make R of time
constant CR O equivalently and the output is turned OFF.
New products = Development of 5V-1A rated small-sized STK7570 series
Series
Lineup
Type No.
STK7571A
STK7571B
Maximum Ratings / Ta=25°C
Vin max
Tc max Tstg
(vdc)
(˚C)
(˚C)
50
–30 to
105
[25]
+105
OUTPUT 1
Vo
Io av
(V)
(A)
1
5V±0.1V
1
Io pk
(A)
1.2
1.2
OUTPUT 2
Vo
Io av
(V)
(A)
2
12V±0.2V
3
Io pk
(A)
4
6
STK7572A
STK7572B
50
–30 to
1
1.2
2
4
105
5V±0.1V
15V±0.3V
[30]
+105
1
1.2
3
6
STK7573A
STK7573B
STK7575B
STK7575B
60
–30 to
1
1.2
2
4
105
5V±0.1V
24V±0.4V
[35]
+105
1
1.2
3
6
70
–30 to
1
1.2
2
4
105
5V±0.1V
36V±0.6V
[45]
+105
1
1.2
3
6
No.1773–12/13
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