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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
BP5220 / BP5220X BP5221 / BP5221X BP5222 / BP5222X Input voltage Output voltage Output current Power conversion effciency 8~38 5 1 85 (VIN=15V) 8~38 5 0.5 84 (VIN=15V) 15~38 12 0.5 90 (VIN=20V) Unit V V A %
Absolute maximum ratings (Ta=25C)
Parameter Input voltage Output current Operating temperature range Storage temperature range Symbol VIN IO Topr Tstg Limits BP5220 / BP5220X 8~38 1 BP5221 / BP5221X 8~38 0.5 -20~+70 -25~+80 BP5222 / BP5222X 15~38 0.5 Unit V A C C
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BP5220 / BP5221 / BP5222 / BP5220X / BP5221X / BP5222X
Block diagram
BP5220 / BP5221 / BP5222
DRIVE CIRCUIT
POWER SUPPLY CIRCUIT
CONTROL CIRCUIT
N. C. 9 VIN 7 6 ADJ
N. C. 5 N. C. 4 CTL 3 GND 2 VOUT 1 FB
Electrical characteristics BP5220 / BP5220X (Unless otherwise noted: VIN=15V, IO=0.5A, SW=1, Ta=25C)
Parameter Input voltage Output voltage Output current Line regulation Load regulation Output ripple voltage Power conversion efficiency Switching frequency CTL pin ON resistance CTL pin OFF resistance Symbol VIN VO IO VO1 VO2 Min. 8 4.75 - - - - 75 - - 200 Typ. - 5 - 35 20 30 85 190 - - Max. 38 5.25 1 80 80 70 - - 4.7 - Unit V V A mV mV mVPP % kHz k k VO > 4.75V VO < 0.1V, SW=2 select IO=1A VIN < 30V VIN=8V~38V IO=0.1A~1A
2 1
Conditions
r
fSW RON ROFF
1 Derating required according to the input voltage and ambient temperature. 2 Pulse noise not included.
BP5221 / BP5221X (Unless otherwise noted: VIN=15V, IO=0.25A, SW=1, Ta=25C)
Parameter Input voltage Output voltage Output current Line regulation Load regulation Output ripple voltage Power conversion efficiency Switching frequency CTL pin ON resistance CTL pin OFF resistance Symbol VIN VO IO VO1 VO2 Min. 8 4.75 - - - - 70 - - 200 Typ. - 5 - 35 20 30 84 190 - - Max. 38 5.25 0.5 80 80 70 - - 4.7 - Unit V V A mV mV mVPP % kHz k k VO > 4.75V VO < 0.1V, SW=2 select IO=0.5A VIN=8V~38V IO =0.05A~0.5A
2 1
Conditions
r
fSW RON ROFF
1 Derating required according to the input voltage and ambient temperature. 2 Pulse noise not included.
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BP5220 / BP5221 / BP5222 / BP5220X / BP5221X / BP5222X
BP5222 / BP5222X (Unless otherwise noted ; VIN=20V, IO=0.25A, SW=1, Ta=25C)
Parameter Input voltage Output voltage Output current Line regulation Load regulation Output ripple voltage Power conversion efficiency Switching frequency CTL pin ON resistance CTL pin OFF resistance Symbol VIN VO IO VO1 VO2 r fSW RON ROFF Min. 15 11.2 - - - - 75 - - 200 Typ. - 12 - 22 45 35 90 190 - - Max. 38 12.8 0.5 80 80 70 - - 4.7 - Unit V V A mV mV mVPP % kHz k k VO > 11.2V VO < 0.1V, SW=2 select IO=0.5A
2 1
Conditions
VIN=15V~38V IO=0.05A~0.5A
2
1 Derating required according to the input voltage and ambient temperature. 2 Pulse noise not included.
Measurement circuit
BP5220 / BP5221 / BP5222 BP5220X / BP5221X / BP5222X 9 Input 7 6 5 4 3 2 1
A
SW 100F / 50V 1 2 470F / 50V 0.47F
+ +
A
Outrput
V
V
f
200k
4.7k
f ; Frequency counter 100F/50V, 470F/50V ; PL series / NICHIKON(Low-impedance type)
Fig.1
T Switching frequency=1/T
Output ripple voltage
Note that output ripple voltage depends on the type and characteristics of the output capacitor.
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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)
VIN
Be sure to use fuse for safety
BP5220 / BP5221 / BP5222 BP5220X / BP5221X / BP5222X
9 7 6 5 4 3 2 1
VIN
Be sure to use fuse for safety
VO
+
100F
+
470F
Fig.2
BP5220 / BP5221 / BP5222 BP5220X / BP5221X / BP5222X
9 7 6 5 4 3 2 1
OUTPUT OFF VO
SW
+ +
100F
470F
Fig.3
Application example Application example 1 : DC / DC converter with a protection circuit
BP5220 / BP5221 / BP5222 BP5220X / BP5221X / BP5222X VIN 24V
+
9 7 6 5 4 3 2 1
6
820 1k
+
OUTPUT VOLTAGE (V)
0.22
VO 5V
5 4 VIN =24V 3 2 1
100F 2.2M
470F
0.1F
+ COMP. -
33k
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
VIN
+
+
VO 470F
100F ON / OFF 100k 2SC1740 100k
Fig.6
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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 VO
+
Be sure to use fuse for safety
7
6
5
4
3
2
9
7
6
5
4
3
2
1 VO
+
VIN
+
VIN 470F
+
VR 100F
470F
100F
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=(VO-1.281) / (0.0278-0.00556VO) (k) BP5222, BP5222X R=(Vo-1.281) / (0.1196-0.01Vo) (k) (2) When increasing the output voltage BP5220 / BP5221, BP5220X / BP5221X R=11160 / (48.4Vo-242) (k) BP5222, BP5222X R=1200 / (9.368Vo-112) (k) 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 VIN 24V
Be sure to use fuse for safety
7
6
5
4
3
2
1
+
VO 470F
+
100F
470k 2SC1740R 100k
+ C1
10F
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.
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BP5220 / BP5221 / BP5222 / BP5220X / BP5221X / BP5222X
Operation notes (1) 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. (2) Pins 5 and 7 are no connected. (3) No circuit is installed in the modules to protect against over output currents. Take physical safety measures such as fusing if short-circuit loading is probable. (4) 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 Figs.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 of application 1 or the slow start circuit of application 4. Electrical characteristic curves BP5220, BP5220X
1200 1000 VIN=34V 800 VIN=38V 600 400 200
100
CURRENT FLOWING INTO PIN9 (A) VIN =8V VIN =23V VIN =38V 60
20 10 5 3 2 1 0.5 0.3 Tc=25C SINGLE PULSE 0.2 0.1 1 Pw=1ms Pw=0.2ms
OUTPUT CURRENT : Io (mA)
VIN=8~15V VIN=25V VIN=30V EFFICIENCY : (%)
80
40
20
0
25
50
70
100
120
0
200
400
600
800
1000
2
3
5
10
20 30
50
AMBIENT TEMPERATURE : Ta(C)
OUTPUT CURRENT : Io (A)
VOLTAGE BETWEEN PIN2 AND PIN9 (V)
Fig.10 Derating curve
Fig.11 Efficiency
Fig.12 Safety operation range
BP5221, BP5221X
0.6 0.5 0.4 0.3 0.2 0.1 100 VIN =8V OUTPUT CURRENT : Io (A) VIN=8~20V VIN=30~38V EFFICIENCY : (%) 80 VIN =23V OUTPUT CURRENT INTO PIN9 (A) 5 3 2 Pw=10ms 1 0.5 0.3 Tc=25C SINGLE PULSE 0.2 0.1 1 Pw=1ms
60
VIN =38V
40
20
0
25
50
70
100
120
0
0.1
0.2
0.3
0.4
0.5
2
3
5
10
20 30
50
AMBIENT TEMPERATURE : Ta (C)
OUTPUT CURRENT : Io (A)
VOLTAGE BETWEEN PIN2 AND PIN9 (V)
Fig.13 Derating curve
Fig.14 Efficiency
Fig.15 Safety operation range
74
6/8
BP5220 / BP5221 / BP5222 / BP5220X / BP5221X / BP5222X
BP5222, BP5222X
0.6 0.5 0.4 0.3 0.2 0.1 100 VIN=23V OUTPUT CURRENT : Io (A)
VIN=15~20V
OUTPUT CURRENT INTO PIN9 (A)
5 3 2 1 0.5 0.3 Tc=25C SINGLE PULSE 0.2 0.1 1 Pw=10ms Pw=1ms
80 EFFICIENCY : (%)
VIN=38V VIN =30V
VIN=30V VIN=38V
60
40
20
0
25
50
70
100
120
0
0.1
0.2
0.3
0.4
0.5
2
3
5
10
20 30
50
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
pin9 sink current
BP5220 / BP5221 / BP5222 BP5220X / BP5221X / BP5222X 9 7 6 5 4 3 2 1
+
+
Voltage developed between pins 2 and 9
Fig.19 ASO measurement circuit
External dimensions (Units : mm)
28.0 Max. 12.0 Max. 1pin SIDE MARK 28.0 Max. 12.0 Max.
1pin SIDE MARK
Marked side
19.5 Max.
Pin No. 1 2 3 4 5 6 7 2.54 2.54x8=20.32
9 0.5 1.4
41
Pin No.
1234567
0.50.1
9
21.5 Max.
Marked side
4.0 Max. 7.0 +1.0 -0.5
8.0 Max.
4.0 Max.
8.0 Max.
1.1 +0.2 -0.1
p=2.540.2
2.54x8=20.32
SIP9
SIP9 (L forming)
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Precautions on Use of ROHM Power Module
Safety Precautions
1) The products are designed and produced for application in ordinary electronic equipment (AV equipment, OA equipment, telecommunication equipment, home appliances, amusement equipment etc.). If the products are to be used in devices requiring extremely high reliability (medical equipment, transport equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or operational error may endanger human life and sufficient fail-safe measures, please consult with the Company's sales staff in advance. If product malfunctions may result in serious damage, including that to human life, sufficient fail-safe measures must be taken, including the following: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits in the case of single-circuit failure 2) The products are designed for use in a standard environment and not in any special environments. Application of the products in a special environment can deteriorate product performance. Accordingly, verification and confirmation of product performance, prior to use, is recommended if used under the following conditions: [a] Use in various types of liquid, including water, oils, chemicals, and organic solvents [b] Use outdoors where the products are exposed to direct sunlight, or in dusty places [c] Use in places where the products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use in places where the products are exposed to static electricity or electromagnetic waves [e] Use in proximity to heat-producing components, plastic cords, or othe flammable items [f] Use involving sealing or coating the products with resin or other coating materials [g] Use involving unclean solder or use of water or water-soluble cleaning agents for cleaning after soldering [h] Use of the products in places subject to dew condensation 3) The products are not radiation resistant. 4) The Company is not responsible for any problems resulting from use of the products under conditions not recommended herein. 5) The Company should be notified of any product safety issues. Moreover, product safety issues should be periodically monitored by the customer.
Precautions Regarding Application Example and External Circuits
1) If change is made to the constant of an external circuit, allow a sufficient margin due to variations of the characteristics of the products and external components, including transient characteristics, as well as static characteristics. Please be informed that the Company has not conducted investigations on whether or not particular changes in the application examples or external circuits would result in the infringement of patent rights of a third party. 2) The application examples, their constants, and other types of information contained herein are applicable only when the products are used in accordance with standard methods. Therefore, if mass production is intended, sufficient consideration to external conditions must be made.
Prohibitions Regarding Industrial Property
1) These Specifications contain information related to the Company's industrial property. Any use of them other than pertaining to the usage of appropriate products is not permitted. Duplication of these Specifications and its disclosure to a third party without the Company's permission is prohibited. 2) Information and data on products, including application examples, contained in these specifications are simply for reference; the Company does not guarantee any industrial property rights, intellectual property rights, or any other rights of a third party regarding this information or data. Accordingly, the Company does not bear any responsibility for: [a] infringement of the intellectual property rights of a third party [b] any problems incurred by the use of the products listed herein. 3) The Company prohibits the purchaser of its products to exercise or use the intellectual property rights, industrial property rights, or any other rights that either belong to or are controlled by the Company, other than the right to use, sell, or dispose of the products.
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