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PDF BP5221A Data sheet ( Hoja de datos )
| Número de pieza | BP5221A | |
| Descripción | Step-down DC/DC Converters | |
| Fabricantes | ROHM Semiconductor | |
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Data Sheet
Step-down DC/DC Converters(Non-isolated)
BP5220A / BP5221A / BP5222A
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.
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.
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
Dimensions (Unit : mm)
28.0 Max.
Marked side
12.0
Max.
19.5 Max.
Pin No.1 2 3 4 5 6 7
2.54
9
0.5
1.4
2.54x 8=20.32
4±1
4.0
Max.
8.0
Max.
Note : Dimensions without tolerance is typical.
SIP9
Lineup
Input voltage
Output voltage
Output current
Power conversion
efficiency
BP5220A
8 to 38
5
1
85
(Vi=15V)
BP5221A
8 to 38
5
0.5
84
(Vi=15V)
BP5222A
15 to 38
12
0.5
90
(Vi=20V)
Unit
V
V
A
%
Absolute maximum ratings (Ta=25 °C)
Parameter
Symbol
Input voltage
Output current
Operating temperature range
Storage temperature range
Vi
IO
Topr
Tstg
BP5220A
8 to 38
1
Limits
BP5221A
8 to 38
0.5
BP5222A
15 to 38
0.5
Unit
V
A
°C
°C
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/7
2011.10 - Rev. C
1 page  
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
9 7654321
Vi
+ Be sure to use
fuse for safety.
VO
+
VR
BP5220A / BP5221A / BP5222A
9 7654321
Vi
+
100 F
Be sure to use
fuse for safety.
VR
VO
+
470 F
Fig.7
Fig.8
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 ±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 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 7654321
Vi
24V + Be sure to use
100 F fuse for safety.
+
470 F
VO
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.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/7
2011.10 - Rev. C
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet BP5221A.PDF ] | |
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