Communication ICs
AC / DC converter
BP5037
The BP5037 is an AC / DC converter that converts commercial AC100V power to
)DC12V.
It provides a simple power
supply solution for computers, DC motors, and LEDs etc., and eliminates the need for a transformer.
FApplications
Home appliances such as rice cookers, IH cookers, air
cleaners, refrigerators, and DC fan motors and sensors
FFeatures
1) By eliminating the need for a transformer, power sup-
ply PC boards can be made small and compact.
2) Wide input voltage range (AC80Vrms to AC120Vrms).
FAbsolute
maximum ratings (Ta = 25_C)
3) Allows simple construction of a DC power supply with
few external parts.
FRecommended
operating conditions (Ta = 25_C)
FPin
descriptions
649
Communication ICs
FExternal
components
(1) Diode (D
1
)
The rectifying diode should fulfill the following conditions.
With regard to absolute ratings, the reverse surge current
should be 400V or higher, the average rectifying current
should be 0.5A or higher, and the forward surge current
should be 20A or higher. An acceptable example is the
1SR35-400A.
BP5037
(2) Capacitor for input voltage smoothing
For half-wave rectification use a capacitor of at least
33µF, and for full-wave rectification use a capacitor of at
least 10µF. In both cases, the capacitor should have a
withstanding voltage of at least 200V.
(3) Coil (L
1
)
The inductance should be in the range 820µH to 1.8mH,
and the rated current should be at least 0.3A. This coil in-
fluences the characteristics of the BP5037, so consult
your sales representative before use.
(4) Capacitor for output voltage smoothing (C
2
)
This capacitor should have a low ESR. Capacitors de-
signed for low-impedance switching power supplies are
especially suitable.
The withstanding voltage should be at least 35V and the
allowable ripple current should be at least 0.1A.
FOperation
notes
(1) Component placement
Refer to the component placement diagram and keep the
cross-hatched distances as small as possible.
(2) In-rush current suppression resistor
Use an in-rush current suppression resistor of 10Ω or
lower.
(3) The output current needs to be reduced as the am-
bient temperatures rises.
(4) Lead pins should be securely soldered.
If the common pins are not securely connected, or pins
which connected internally but are not used are con-
nected to other pins, abnormal voltages can be gener-
ated resulting in component failure.
(5) Excessive current and shorted leads
The excessive current limit is a drooping model. At 25_C,
if excessive current which exceeds the absolute maxi-
mum ratings is produced intermittently, or is produced
continuously for a total of one minute or longer, the prod-
uct is vulnerable to damage.
If there is any danger of the load being shorted or exces-
sive current being produced, always use a protective de-
vice such as a fuse.
(6) Do not subject this product to strong impact.
(7) Regulations governing electrical products
As a stand-alone product, this product is not subject to
regulations governing electrical appliances.
Please be aware, therefore, that applications must be
submitted for sets and not for individual products.
(8) Insulation
This product is not insulated on the primary or secondary
sides, and there is danger of electrical shock if it is
touched.
(9) Connection with other devices
Equipment using this product should not be connected to
other equipment. If connected, insulation should be pro-
vided.
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