DC / DC converter
BP5220 / BP5221 / BP5222 /
BP5220X / BP5221X / BP5222X
The BP5220, BP5221, BP5222, BP5220X, BP5221X, and BP5222X are DC / DC converters that use a pulse
width modulation (PWM) system. They contain control circuits, switching devices, rectifiers, and coils, and operate
by only connecting an I / O smoothing capacitor. With a high efficiency of power conversion, the modules are
available in stand-alone 9-pin SIP packages with no heat sink required. They can be applied to various purposes
by fine-adjusting the output voltage and switching on and off. With a wide range of input voltage, the modules are
best suited for obtaining a stable local power supply from a main power supply with a large voltage variation.
Applications
Power supplies for copiers, personal computers, facsimiles, AV equipment, measuring instruments, vending
machines, security device, registers, industrial equipment, and maintenance tools
Features
1) Wide range of input voltage.
2) High power conversion efficiency.
3) Built-in output ON / OFF switch.
4) Applicable to various purposes by
fine-adjusting the output voltage.
5) Small number of external components required.
6) Heat sink unnecessary.
7) Compact package.
BP5220 / BP5221 / BP5222 : SIP9
BP5220X / BP5221X / BP5222X : SIP9
(L-shaped lead type)
List of the series
Unit
V
V
A
%
15~38
12
0.5
90
(V
IN
=20V)
BP5220 / BP5220X BP5221 / BP5221X BP5222 / BP5222X
Input voltage
8~38
8~38
Output voltage
5
5
Output current
1
0.5
Power conversion
effciency
85
(V
IN
=15V)
84
(V
IN
=15V)
Absolute maximum ratings (Ta=25°C)
Limits
BP5220 / BP5220X
8~38
1
BP5221 / BP5221X
8~38
0.5
BP5222 / BP5222X
15~38
0.5
Unit
V
Parameter
Symbol
Input voltage
V
IN
Output current
I
O
BP5220 / BP5221 / BP5222 /
BP5220X / BP5221X / BP5222X
Block diagram
BP5220 / BP5221 / BP5222
DRIVE CIRCUIT
POWER
SUPPLY
CIRCUIT
CONTROL CIRCUIT
N. C.
6
ADJ
N. C.
FB
CTL
GND
V
OUT
5
4
3
2
1
N. C.
9
7
V
IN
Electrical characteristics BP5220 / BP5220X
(Unless otherwise noted: V
IN
=15V, I
O
=0.5A, SW=1, Ta=25°C)
Typ.
−
38
5.25
1
80
80
70
−
%
kHz
kΩ
kΩ
V
O
>
4.75V
V
O
<
0.1V, SW=2 select
−
4.7
−
I
O
=1A
mV
PP
mV
I
O
=0.1A~1A
∗2
Parameter
V
V
A
mV
V
IN
=8V~38V
V
IN
<
30V
∗1
Symbol
Min.
Max.
Unit
Conditions
Input voltage
5
−
35
20
30
85
190
−
−
V
IN
8
Output voltage
V
O
4.75
Output current
I
O
−
Line regulation
∆V
O1
−
Load regulation
∆V
O2
−
Output ripple voltage
½
r
−
Power conversion efficiency
η
75
Switching frequency
f
SW
−
CTL pin ON resistance
R
ON
−
CTL pin OFF resistance
R
OFF
200
∗1
Derating required according to the input voltage and ambient temperature.
∗2
Pulse noise not included.
BP5221 / BP5221X
(Unless otherwise noted: V
IN
=15V, I
O
=0.25A, SW=1, Ta=25°C)
Typ.
−
5
Max.
38
5.25
Unit
V
V
Conditions
Parameter
Symbol
Min.
Input voltage
V
IN
8
Output voltage
V
O
4.75
BP5220 / BP5221 / BP5222 /
BP5220X / BP5221X / BP5222X
Typ.
−
38
12.8
0.5
80
80
70
mV
PP
%
kHz
kΩ
kΩ
V
O
<
0.1V, SW=2 select
V
O
>
11.2V
∗2
∗2
BP5222 / BP5222X
(Unless otherwise noted ; V
IN
=20V, IO=0.25A, SW=1, Ta=25°C)
Max.
V
V
A
mV
mV
I
O
=0.05A~0.5A
V
IN
=15V~38V
∗1
Parameter
Symbol
Min.
Unit
Conditions
Input voltage
12
−
22
45
35
90
190
−
4.7
−
−
−
−
I
O
=0.5A
V
IN
15
Output voltage
V
O
11.2
Output current
I
O
−
Line regulation
∆V
O1
−
Load regulation
∆V
O2
−
Output ripple voltage
½
r
−
Power conversion efficiency
η
75
Switching frequency
f
SW
−
CTL pin ON resistance
R
ON
−
CTL pin OFF resistance
R
OFF
200
∗1
Derating required according to the input voltage and ambient temperature.
∗2
Pulse noise not included.
Measurement circuit
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
7
6
5
4
3
2
1
9
Input
A
SW
0.47µF
1
+
A
2
Outrput
100µF / 50V
4.7k
200k
f ; Frequency counter
100µF/50V, 470µF/50V ; PL series / NICHIKON(Low-impedance type)
Fig.1
T
Switching frequency=1/T
470µF / 50V
V
+
V
f
Output ripple voltage
BP5220 / BP5221 / BP5222 /
BP5220X / BP5221X / BP5222X
Circuit operation
(1) The basic application examples are shown in Fig.2.
The externally installed parts are only 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 to
be open (high impedance). (See Fig.3)
(3) Fine adjustment of the output voltage is allowed.
The fine adjustment of output voltage can be
performed from pin 6 via the resistor by connecting
the output terminal (pin 2) or GND.(See application
example3)
V
IN
Be sure to use
fuse for safety
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
9
7
6
5
4
3
2
1
V
IN
Be sure to use
fuse for safety
V
O
+
100µF
+
470µF
Fig.2
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
9
7
6
5
4
3
2
1
OUTPUT
OFF
V
O
SW
+
+
100µF
470µF
Fig.3
Application example
Application example 1 : DC / DC converter with a protection circuit
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
V
IN
24V
+
9
7
6
5
4
3
2
1
6
820Ω
1kΩ
+
OUTPUT VOLTAGE (V)
0.22Ω
V
O
5V
5
4
V
IN
=24V
3
2
1
100µF
2.2MΩ
470µF
0.1µF
+
COMP.
−
33kΩ
120pF
BA10393
0
0.2
0.4
0.6
0.8
1.0
1.2
OUTPUT CURRENT (A)
Fig.4
Fig.5
A resistor to secure the rise of output at power on. The resistance to be selected 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.
Application example 2 : Output ON / OFF control
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
9
Be sure to use
fuse for safety
7
6
5
4
3
2
1
V
IN
+
+
V
O
470µF
100µF
ON / OFF
100kΩ
2SC1740
100kΩ
Fig.6
4/8
BP5220 / BP5221 / BP5222 /
BP5220X / BP5221X / BP5222X
Application example 3 : Output voltage fine adjustment
(1) When reducing the output voltage
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
9
Be sure to use
fuse for safety
(2) When increasing the output voltage
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
1
V
O
+
Be sure to use
fuse for safety
7
6
5
4
3
2
9
7
6
5
4
3
2
1
V
O
+
V
IN
+
V
IN
470µF
+
VR
100µF
470µF
100µF
VR
Fig.7
Fig.8
VR value setting equations(The output voltage after adjustment is denoted Vo.)
(1) When reducing the output voltage
BP5220 / BP5221, BP5220X / BP5221X
R=(V
O−
1.281) / (0.0278
−
0.00556V
O
) (kΩ)
BP5222, BP5222X
R=(Vo
−
1.281) / (0.1196
−
0.01Vo) (kΩ)
(2) When increasing the output voltage
BP5220 / BP5221, BP5220X / BP5221X
R=11160 / (48.4Vo
−
242) (kΩ)
BP5222, BP5222X
R=1200 / (9.368Vo
−
112) (kΩ)
To make full use of the ability of the the module products, we recommended the output voltage be
adjusted within
±
20% of the output voltage rating. When the output voltage is increased by 20%, for
instance, the minimum input voltage is also increased by 20%.
(Example : When the output voltage is changed from 5V to 6V in the BP5220, the minimum input voltage
is changed from 8V to 9.6V)
Application example 4 : Slow start
The slow start circuit mitigates the pulse load on the internal switching transistor when input voltage is applied,
and rises the output voltage gradually by starting the switching operation slowly.
This application is useful for preventing the malfunction of an external protection circuit due to a rush current,
and can serve as a countermeasure against the operation outside the safe operation range.
BP5220 / BP5221 / BP5222
BP5220X / BP5221X / BP5222X
9
V
IN
24V
Be sure to use
fuse for safety
7
6
5
4
3
2
1
+
V
O
470µF
+
100µF
470kΩ
2SC1740R
100kΩ
+
C1
10µF
Fig.9
C1 is a slow-start capacitor for mitigating the over rush current that flows into the modules when the switch is
turned on.
5/8
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