DC/DC converter
BP5232A25/BP5232A33
BP5233A33/BP5234A33
Dimensions
(Unit : mm)
T
T
H
Applications
Power supplies for copiers, personal computers, facsimiles,
industrial equipment, and AV equipment.
4±1.0
0.5±0.1
1.3±0.2
P=2.54±0.2
0.25±0.05
L
H
19.5
19.5
23.5
23.5
Marked side
The BP5232A25, BP5232A33, BP5233A33, BP5234A33 are
DC/DC converters that use PWM system and VFM system.
They contain control circuits, switching devices 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 SIP packages with no heat sink
required.
Marked side
T
12.0
12.0
11.0
12.5
Features
1) High power conversion efficiency. (BP5233A33 : 93%)
2) Large output current.
3) Low current consumption with no load.
(BP5233A33 : 200µA Typ.)
4) High conversion efficiency. (85% at output current of 100mA)
5) Applicable to various purposes by fine-adjusting output
voltage with external circuits.
6) Built-in ON / OFF switch.
7) Heat sink unnecessary.
BP5232A25
BP5232A33
BP5233A33
BP5234A33
28.0
28.0
32.5
38.5
Absolute maximum ratings
(Ta=25°C)
Parameter
Input voltage
Output current
Operating temperature
Storage temperature
Symbol
V
IN
I
O
Topr
Tstg
2
∗
2
∗
−20
to +55
−25
to +80
Limits
BP5232A25 BP5232A33 BP5233A33 BP5234A33
7
3
∗
4
∗
Unit
V
A
°C
°C
∗
Derating required according to the input voltage and ambient temperature.
Recommended operating conditions
(Ta=25°C)
Parameter
Input voltage
Symbol
V
IN
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
Rev.C
1/7
Block diagram
BP5232A25 / BP5232A33
BP5233A33 / BP5234A33
V
IN
=5V
9
2
V
O
+
470µF
V
IN
=5V
9
2
V
O
+
470µF
1000µF
10
3
1000µF
+
+
10
3
11
Control circuit
1
Control circuit
1
7
CTL signal
ON / OFF
CTL signal
ON / OFF
7
6
5
4
6
5
4
Pin descriptions
BP5232A25 , 5232A33
Pin No.
1
2
3
4
5
Pin description
Feed back
BP5233A33 , BP5234A33
Pin No.
6
7
9
10
Pin description
GND
CTL
V
IN
1
V
IN
2
Pin No.
1
2
3
4
5
Pin description
Feed back
Pin No.
6
7
9
10
11
Pin description
GND
CTL
V
IN
1
V
IN
2
V
IN
3
V
OUT
1
V
OUT
2
GND
GND
V
OUT
1
V
OUT
2
GND
GND
Pin 8 is removed.
Pin 8 is removed.
Electrical characteristics
BP5232A25 (Unless otherwise noted, V
lN
=5V, I
O
=1A, SW=1, Ta=25°C)
Parameter
Input voltage
Output voltage
Output current
Current consumption at no load
Load regulation
Output ripple voltage
Power conversion efficiency
CTL pin ON voltage
CTL pin OFF voltage
Symbol
V
IN
V
O
I
O
I
IN
∆V
O
Min.
4.5
2.4
−
−
−
−
84
1.8
−
Typ.
5
2.5
−
200
13
33
89
−
−
Max.
5.5
2.6
2
300
33
100
−
−
0.3
Unit
V
V
A
µA
mV
mV
PP
%
V
SW=2
SW=2
∗1
Conditions
DC
Measurement circuit
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
I
O
=0A
I
O
=0.1A to 2A
∗2
υγ
η
V
ON
V
OFF
V
∗1
Derating required according to the input voltage and ambient temperature.
∗2
Pulse noise not included.
Rev.C
2/7
BP5232A33
(Unless otherwise noted,
Parameter
Input voltage
Output voltage
Output current
Current consumption at no load
Load regulation
Output ripple voltage
Power conversion efficiency
CTL pin ON voltage
CTL pin OFF voltage
V
IN
V
O
I
O
I
IN
V
IN
=5V, I
O
=1A, SW=1, Ta=25°C)
Symbol
Min.
4.5
3.17
−
−
−
−
88
1.8
−
Typ.
5
3.3
−
200
16
33
93
−
−
Max.
5.5
3.43
2
300
42
100
−
−
0.3
Unit
V
V
A
µA
mV
mV
PP
%
V
∗1
Conditions
DC
Measurement circuit
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
I
O
=0A
I
O
=0.1A to 2A
∆V
O
υγ
η
V
ON
SW=2
SW=2
Fig.1
Fig.1
V
OFF
V
∗1
Maximum output current must be reduced by ambient temperature.
BP5233A33
(Unless otherwise noted, V
IN
=5V, I
O
=1.5A, SW=1, Ta=25°C)
Parameter
Input voltage
Output voltage
Output current
Current consumption at no load
Load regulation
Output ripple voltage
Power conversion efficiency
CTL pin ON voltage
CTL pin OFF voltage
Symbol
V
IN
V
O
I
O
I
IN
∆V
O
Min.
4.5
3.17
−
−
−
−
88
1.8
−
Typ.
5
3.3
−
200
16
33
93
−
−
Max.
5.5
3.43
3
300
42
150
−
−
0.3
Unit
V
V
A
µA
mV
mV
PP
%
V
SW=2
SW=2
∗1,
4
Conditions
DC
∗2
Measurement circuit
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
I
O
=0A
I
O
=0.1A to 3A
∗3
υγ
η
V
ON
V
OFF
V
∗1
Maximum output current must be reduced by ambient temperature.
∗2
Give the start time of input as 5ms within.
∗3
An output ripple voltage sometimes changes in capacitor to use, the measurement environment.
∗4
There is restriction in use time, in the case that the output current is 2.5A over.
Please refer to " the passage output current characteristic" of later description.
BP5234A33
(Unless otherwise noted, V
IN
=5V, I
O
=2A, SW=1, Ta=25°C)
Parameter
Input voltage
Output voltage
Output current
Current consumption at no load
Load regulation
Output ripple voltage
Power conversion efficiency
CTL pin ON voltage
CTL pin OFF voltage
Symbol
V
IN
V
O
I
O
I
IN
∆V
O
Min.
4.5
3.17
−
−
−
−
88
1.8
−
Typ.
5
3.3
−
300
16
33
93
−
−
Max.
5.5
3.43
4
400
42
150
−
−
0.3
Unit
V
V
A
µA
mV
mV
PP
%
V
SW=2
SW=2
∗1,
3
Conditions
DC
Measurement circuit
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
I
O
=0A
I
O
=0.1A to 4A
∗2
υγ
η
V
ON
V
OFF
V
∗1
Maximum output current must be reduced by ambient temperature.
∗2
Give the start time of input as 5ms within.
∗3
An output ripple voltage sometimes changes in capacitor to use, the measurement environment.
Rev.C
3/7
Measurement circuit
BP5232A25 / BP5232A33
10
9
1
2
SW
7
6
5
4
3
2
1
V
O
A
V
IN
A
1000
µ
F / 50V
V
C2
C1
+
+
470
µ
F / 50V
0.47
µ
F
V
C3
f
f
:
frequency counter
C1, C2 :
Low impedance type
C3
:
film capacitor
∗
A
large ripple current flows to the input smoothing capacitor due
to the output load. Be minded to use within the allowable ripple
current of the capacitor.
∗
The capacitor with a particularly low impedance is used as the
output smoothing capacitor C2 so as to suppress the output ripple
voltage. Select the capacitor according to the purpose of use in
each case.
Fig.1
T
Switching frequency=1 / T
Output ripple voltage
Note that the output ripple voltage depends on the type and characteristics of the output capacitor.
BP5233A33 / BP5234A33
11
10
9
1
2
SW
7
6
5
4
3
2
1
V
O
A
V
IN
A
1000
µ
F / 50V
V
C1
+
470
µ
F / 50V
C2
+
0.47
µ
F
V
C3
f
f
:
frequency counter
C1, C2 :
Low impedance type
C3
:
film capacitor
∗
A
large ripple current flows to the input smoothing capacitor due
to the output load. Be minded to use within the allowable ripple
current of the capacitor.
∗
The capacitor with a particularly low impedance is used as the
output smoothing capacitor C2 so as to suppress the output ripple
voltage. Select the capacitor according to the purpose of use in
each case.
Fig.2
T
Switching frequency=1 / T
Output ripple voltage
Note that the output ripple voltage depends on the type and characteristics of the output capacitor.
Rev.C
4/7
Circuit operation
(1) The basic application examples are shown in Fig.3. 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 7 to be low or
open (high impedance). (See Fig.4)
(3) Fine adjustment of the output voltage is allowed. The fine adjustment of output voltage can be performed from
pin 1 via the resistor by connecting the output terminal (pin2, 3) and GND. (See Fig.5)
(4) Be sure to use a fuse for the safety.
Basic application
BP5232A25 / BP5232A33
V
IN
FUSE
+
1000µF
+
470µF
BP5233A33 / BP5234A33
2
1
10
9
7
6
5
4
3
V
O
V
IN
FUSE
11
10
9
7
6
5
4
3
2
1
V
O
+
1000µF
+
470µF
Fig.3
Output ON / OFF control
BP5232A25 / BP5232A33
V
IN
FUSE
+
1000µF
BP5233A33 / BP5234A33
2
1
10
9
7
6
5
4
3
V
O
V
IN
FUSE
11
10
9
7
6
5
4
3
2
1
V
O
SW
+
470µF
SW
+
1000µF
+
470µF
Fig.4
Output voltage fine adjustment
BP5232A25 / BP5232A33
V
IN
FUSE
−
1000µF
BP5233A33 / BP5234A33
2
1
10
9
7
6
5
4
3
V
O'
R1
V
IN
FUSE
11
10
9
7
6
5
4
3
2
1
V
O'
R1
V
O
R2
SW
+
470µF
SW
+
1000µF
V
O
R2
V
O'
value setting equations
V
O'
=V
O
1+
R1
R2
R1+R2
≤
50kΩ
It is recommended that the output voltage should be adjusted
within the range of
±10%
of the rated output voltage, so that
the performance of the module can fully be exhibited.
Fig.5
Rev.C
5/7
PCB设计
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