Datasheet

Data Sheet
BP5220A/BP5221A/BP5222A
Circuit operation
(1) The basic application examples are shown in Fig.2.
The only external parts required are the input and
output smoothing capacitors.
(2) Switching on and off the output voltage is allowed.
The output can be switched off by making pin 4
open (high impedance). (See Fig.3)
(3) Fine adjustment of the output voltage is allowed.
Adjustment of the output voltage can be
performed from pin 6 via the resistor by connecting
the output terminal (pin 2) or GND. (See
application example 3)
Application Examples
Application Example 1 : DC / DC converter with protection circuit
Fig.3
120pF
COMP.
+
BA10393
Vi
24V
V
O
5V
9 7654321
BP5220A / BP5221A / BP5222A
+
+
Fig.4
Vi = 24V
0.2 0.4 0.6 0.8 1.0 1.2
6
5
4
3
2
1
0
OUTPUT CURRENT (A)
OUTPUT VOLTAGE (V)
Fig.5
Fig.6
A resistor is used to limit the rise of output at power on. The resistance depends on the input voltage.
This is a standard application. Because the control current fluctuates with variations in circuits and components,
set the control current by adding a sufficient margin to the normal current level.
97654321
Vi
V
O
BP5220A / BP5221A / BP5222A
+
+
Fig.2
Be sure to use fuse for safety.
9 7654321
Vi
SW
V
O
BP5220A / BP5221A / BP5222A
Output OFF
+
+
Be sure to use fuse for safety.
Application Example 2 : Output ON / OFF control
9 7654321
Vi VO
470 F
100k
100k
2SC1740
BP5220A / BP5221A / BP5222A
ON / OFF
100 F
+
+
Be sure to use fuse for safety.
4/7
2010.03 - Rev. B
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