ETC BP5037

Regulator ICs
AC / DC converter
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.
Home appliances such as rice cookers, IH cookers, air
cleaners, refrigerators, and DC fan motors and sensors
1) By eliminating the need for a transformer, power supply PC boards can be made small and compact.
2) Wide input voltage range (AC80Vrms to AC120Vrms).
3) Allows simple construction of a DC power supply with
few external parts.
Absolute maximum ratings (Ta = 25C)
Recommended operating conditions (Ta = 25C)
Pin descriptions
Regulator ICs
Electrical characteristics (unless otherwise noted, Ta = 25C)
Measurement circuit
Regulator ICs
Application examples
Half-wave rectification type
Full-wave rectification type
IH cooker application example
Regulator ICs
External components
(1) Diode (D1)
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
Operation 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
(3) The output current needs to be reduced as the ambient temperatures rises.
(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 (L1)
The inductance should be in the range 820µH to 1.8mH,
and the rated current should be at least 0.3A. This coil influences the characteristics of the BP5037, so consult
your sales representative before use.
(4) Capacitor for output voltage smoothing (C2)
This capacitor should have a low ESR. Capacitors designed 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.
(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 connected to other pins, abnormal voltages can be generated resulting in component failure.
(5) Excessive current and shorted leads
The excessive current limit is a drooping model. At 25C,
if excessive current which exceeds the absolute maximum ratings is produced intermittently, or is produced
continuously for a total of one minute or longer, the product is vulnerable to damage.
If there is any danger of the load being shorted or excessive current being produced, always use a protective device 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
(9) Connection with other devices
Equipment using this product should not be connected to
other equipment. If connected, insulation should be provided.
Regulator ICs
Electrical characteristics curves
External dimensions (Units: mm)