BP5220A_10 [ROHM]
Step-down DC/DC Converters(Non-isolated); 降压型DC / DC转换器（非隔离）
| 型号： | BP5220A_10 |
| 厂家： | 
ROHM |
| 描述： | Step-down DC/DC Converters(Non-isolated) |
| 文件： | 总9页 (文件大小：550K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
Dimensions (Unit : mm)
Description
The BP5220A, BP5221A, BP5222A, 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.
28.0 Max.
12.0
Max.
Marked side
19.5 Max.
They can be applied to various purposes by fine-tuning
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.
Pin No.1
2
3
4
5
6
7
9
4
1
0.5
1.4
2.54
4.0
Max.
8.0
Max.
2.54x 8=20.32
Note : Dimensions without tolerance is typical.
SIP9
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 input voltage range
2) High power conversion efficiency.
3) Built-in output ON / OFF switch.
4) Adjustable output voltage ensures wide compatibility
5) Few external components required.
6) Heat sink unnecessary.
7) Compact package.
BP5220A / BP5221A / BP5222A : SIP9
Lineup
BP5220A
BP5221A
BP5222A
Unit
Input voltage
Output voltage
Output current
8 to 38
8 to 38
5
15 to 38
12
V
V
A
5
1
0.5
0.5
85
(Vi=15V)
84
(Vi=15V)
90
(Vi=20V)
Power conversion
efficiency
%
Absolute maximum ratings (Ta=25°C)
Limits
BP5221A
8 to 38
0.5
Parameter
Symbol
Unit
BP5220A
BP5222A
15 to 38
0.5
Vi
Input voltage
8 to 38
1
V
A
Output current
IO
°C
°C
Operating temperature range
Storage temperature range
Topr
Tstg
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev. B
1/7
BP5220A/BP5221A/BP5222A
Data Sheet
Block diagram
BP5220A / BP5221A / BP5222A
DRIVE CIRCUIT
POWER
SUPPLY
CIRCUIT
CONTROL CIRCUIT
N. C.
N. C.
9
7
6
5
4
3
2
1
Vi
ADJ
N. C.
CTL
GND
VOUT
FB
Electrical characteristics
BP5220A (Unless otherwise noted : Vi=15V, Io=0.5A, SW=1, Ta=25˚C)
Parameter
Input voltage
Symbol
Min.
8
Typ.
Max.
38
Unit
Conditions
V
V
Vi
VO
IO
4.75
5
5.25
1
Output voltage
A
Vi<30V
Output current
Vi=8V to 38V
Io=0.1A to 1A
mV
mV
mVPP
%
27
13
80
Line regulation
80
Load regulation
22
70
Output ripple voltage
Power conversion efficiency
Switching frequency
CTL pin ON resistance
CTL pin OFF resistance
75
85
Io=1A
kHz
fSW
RON
ROFF
190
4.7
Vo>4.75V
200
Vo<0.1V, SW=2
BP5221A (Unless otherwise noted : Vi=15V, Io=0.25A, SW=1, Ta=25˚C)
Symbol
Parameter
Input voltage
Min.
8
Typ.
Max.
38
Unit
V
Conditions
Vi
VO
IO
Output voltage
4.75
5
5.25
0.5
50
V
Output current
A
Line regulation
13
3
mV
mV
mVPP
%
Vi=8V to 38V
Load regulation
50
Io=0.05A to 0.5A
Output ripple voltage
Power conversion efficiency
Switching frequency
CTL pin ON resistance
CTL pin OFF resistance
25
84
190
70
70
Io=1A
fSW
RON
ROFF
kHz
4.7
Vo>4.75V
Vo<0.1V, SW=2
200
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev. B
2/7
BP5220A/BP5221A/BP5222A
Data Sheet
BP5222A (Unless otherwise noted : Vi=20V, Io=0.25A, SW=1, Ta=25˚C)
Symbol
Parameter
Input voltage
Min.
15
Typ.
Max.
38
Unit
V
Conditions
Vi
VO
IO
Output voltage
11.2
12
12.8
0.5
50
V
Output current
A
Line regulation
22
18
mV
mV
mVPP
%
Vi=15V to 38V
Load regulation
50
Io=0.05A to 0.5A
Output ripple voltage
Power conversion efficiency
Switching frequency
CTL pin ON resistance
CTL pin OFF resistance
29
70
75
90
Io=0.5A
fSW
RON
ROFF
190
kHz
4.7
Vo>11.2V
Vo<0.1V, SW=2
200
Measurement circuit
BP5220A / BP5221A / BP5222A
9
7
6
5
4
3
2
1
Input
Output
A
A
SW
1
2
+
+
V
V
f
f ; Frequency counter
Fig.1
T
Switching frequency=1/T
Output ripple voltage
Please note that output ripple voltage depends on the type and characteristics of the output capacitor.
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev. B
3/7
BP5220A/BP5221A/BP5222A
Data Sheet
Circuit operation
(1) The basic application examples are shown in Fig.2.
The only external parts required are the input and
output smoothing capacitors.
BP5220A / BP5221A / BP5222A
9
7
6
5
4
3
2
1
Vi
VO
(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)
Be sure to use fuse for safety.
+
+
(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)
Fig.2
BP5220A / BP5221A / BP5222A
Output OFF
VO
Be sure to use fuse for safety.
Vi
9
7
6
5
4
3
2
1
SW
+
+
Fig.3
Application Examples
Application Example 1 : DC / DC converter with protection circuit
6
5
4
3
2
1
0
BP5220A / BP5221A / BP5222A
9
7
6
5
4
3
2
1
VO
5V
Vi
24V
+
+
Vi = 24V
120pF
+
COMP.
BA10393
0.2
0.4
0.6
0.8
1.0
1.2
OUTPUT CURRENT (A)
Fig.4
Fig.5
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.
Application Example 2 : Output ON / OFF control
BP5220A / BP5221A / BP5222A
Be sure to use fuse for safety.
9
7
6
5
4
3
2
1
Vi
VO
+
+
100 F
470 F
ON / OFF
100k
2SC1740
Fig.6
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev. B
4/7
BP5220A/BP5221A/BP5222A
Data Sheet
Application Example 3 : Output voltage adjustment
(1) When reducing the output voltage
(2) When increasing the output voltage
BP5220A / BP5221A / BP5222A
BP5220A / BP5221A / BP5222A
9
7
6
5
4
3
2
1
9
7
6
5
4
3
2
1
Vi
Vi
VO
VO
+
+
+
+
Be sure to use
fuse for safety.
Be sure to use
fuse for safety.
VR
470 F
100 F
VR
Fig.8
Fig.7
VR value setting equations (The output voltage after adjustment is denoted by Vo.)
(1) When reducing the output voltage
BP5220A / BP5221A
BP5222A
(2) When increasing the output voltage
BP5220A / BP5221A
BP5222A
To maximize performance we recommended the output voltage be
adjusted within 20ꢀ of the output voltage rating. When the output voltage is increased by 20ꢀ, for
instance, the minimum input voltage is also increased by 20ꢀ.
(Example : When the output voltage is changed from 5V to 6V in the BP5220A, the minimum input voltage
is charged 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 increases the output voltage gradually by starting the switching operation slowly.
This application is useful for preventing malfunction of an external protection circuit due to rush current,
and can serve as a countermeasure against operation outside the safe operation range.
BP5220A / BP5221A / BP5222A
9
7
6
5
4
3
2
1
Vi
24V
VO
+
+
Be sure to use
fuse for safety.
470 F
100 F
470k
2SC1740R
+
C1
10 F
Fig.9
C1 is a slow-start capacitor for mitigating excessive rush current that flows into the module when the switch is
turned on.
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev. B
5/7
BP5220A/BP5221A/BP5222A
Data Sheet
Operation notes
(1) No circuit is installed in the modules to protect against excessive output currents. Therefore, take physical
safety measures such as using a fuse if short-circuit loading is probable.
(2) The output current should be reduced according to an increase in the input voltage or ambient temperature.
Use the modules within the derating curve range.
(3) A large rush current may flow in the module when the input voltage is applied or the output ON / OFF is
controlled with pin 4 without a capacitor such as C1 in application 4. Operating within the safe operation
ranges shown in Fig.12, 15, and 18.
The safe operation range is determined by the safe operation range of the internal switching transistor.
The amount of rush current depends on the output impedance of the input power supply and capacitors
connected to the module outputs. The pulse load on the internal switching transistor at the start of operation
can be reduced by using the protection circuit in application 1 or the slow start circuit in application 4.
(4) Pins 5 and 7 are not connected.
(5) A smoothing electrolytic capacitor is necessary for I/O external components. Please use a capacitor equivalent
to the recommended one.
(6) Please put an I/O smoothing capacitor near the module. Output ripple voltage may be larger or output voltage
may not be stable.
Electrical Characteristics Curves
BP5220A
1200
1000
800
20
10
5
100
80
Vi=8V
Pw=0.2ms
Vi=23V
Vi=8 to 15V
Vi=25V
Vi=34V
Vi=38V
Vi=38V
3
2
Vi=30V
60
600
Pw=1ms
1
40
400
0.5
Tc=25°C
SINGLE PULSE
0.3
0.2
20
200
0.1
0
25
50
70
100
120
1
2
3
5
10
20 30 50
0
200
400
600
800
1000
AMBIENT TEMPERATURE : Ta( °C)
VOLTAGE BETWEEN PIN2 AND PIN9 (V)
OUTPUT CURRENT : IO (A)
Fig.10 Derating curve
Fig.12 Safety operation range
Fig.11 Efficiency
BP5221A
10
0.6
100
80
60
40
20
Pw=1ms
Vi=8V
4.5A
2.2A
0.5
0.4
0.3
0.2
0.1
Vi=23V
Vi=8 to 15V
Vi=30 to 38V
Pw=10ms
Vi=38V
1
Tc=25°C
SINGLE PULSE
0.1
1
10
100
0
25
50
70
100
120
0
0.1
0.2
0.3
0.4
0.5
VOLTAGE BETWEEN PIN2 AND PIN9 (V)
OUTPUT CURRENT : IO (A)
AMBIENT TEMPERATURE : Ta( °C)
Fig.15 Safety operation range
Fig.14 Efficiency
Fig.13 Derating curve
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev. B
6/7
BP5220A/BP5221A/BP5222A
Data Sheet
BP5222A
0.6
100
80
10
Vi=23V
Vi=38V
Pw=1ms
0.5
4.5A
2.2A
Vi=15 to 20V
Vi=30V
Vi=30V
0.4
Pw=10ms
Vi=38V
60
0.3
0.2
0.1
1
40
20
Tc=25°C
SINGLE PULSE
0.1
0
25
50
70
100
120
1
10
100
0
0.1
0.2
0.3
0.4
0.5
AMBIENT TEMPERATURE : Ta( °C)
OUTPUT CURRENT : IO (A)
VOLTAGE BETWEEN PIN2 AND PIN9 (V)
Fig.16 Derating curve
Fig.17 Efficiency
Fig.18 Safety operation range
Pin 9 sink current
BP5220A / BP5221A / BP5222A
9
7
6
5
4
3
2
1
+
+
Voltage difference
between pins 2 and 9
Fig.19 ASO measurement circuit
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© 2010 ROHM Co., Ltd. All rights reserved.
2010.03 - Rev. B
7/7
Notice
N o t e s
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, commu-
nication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-
controller or other safety device). ROHM shall bear no responsibility in any way for use of any
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© 2010 ROHM Co., Ltd. All rights reserved.
R1010
A
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