Regulator ICs
AC/DC converter unit
The BP5034 is an AC / DC converter which can be used to supply +12V, 100mA DC output from a commercial power
supply (100V AC). Using this unit enables simple, easy drive of microcomputers, LEDs, and other electronic components
without using a transformer. It also allows set PCBs to be kept compact and lightweight, with extremely few attachments.
Power supply circuits for vacuum cleaners, washing machines, refrigerators, electric carpets, electric rice cookers and
crock pots, irons, cordless telephones, air purifiers, humidifiers, dehumidifiers, illumination devices and other small
household appliances, as well as power supply circuits for gas, fire and smoke alarms, DC motors, sensors, and other
similar devices
1) Elimination of a transformer enables compact, lightweight power supply boards.
2) Wide input voltage range. (80 to 120V for AC voltage
3) DC circuits can be easily configured, with few attachments.
4) Because no transformer is used, the power supply
board is less vulnerable to splitting or cracking from
impact or shock.
5) Hybridization of the IC reduces the number of labor
hours in the assembly process.
Absolute maximum ratings (Ta=25C)
Recommended operating conditions (Ta=25C)
Regulator ICs
Pin description
Electrical characteristics (Unless otherwise noted, Ta=25C)
Measurement circuit
Regulator ICs
Application circuit example
Example showing charger of cordless telephone (hand-held set)
Basic power supply circuit
Half wave rectification circuit
Full wave rectification circuit
Regulator ICs
Selecting attachments
(1) Diodes
The rectifying diodes used should fulfill the following
In the absolute maximum ratings, the reverse surge current should be 400V or higher, the average rectifying current should be 0.5A or higher, and the forward surge voltage should be 20A or higher.
(2) Capacitor for input voltage smoothing
A capacitor with a larger capacitance produces a more
stable output voltage, but increases the surge current
when the power supply is turned on. The capacitor
should have a withstand resistance of at least 200V.
Make sure a capacitor between 3.3 and 10µF is used.
Operation notes
(1) The output current needs to be reduced as the ambient temperature rises.
(2) Lead pins should be securely soldered. If common
pins are not securely connected, or pins which are connected internally but which are not used are connected
to other pins, irregular voltages could be produced, causing breakdowns and damage.
(3) Excessive current and shorted loads
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.
(4) Avoid subjecting this product to strong impact.
(5) Regulations governing electrical products
(3) Capacitor for output voltage smoothing
This capacitor should have a low ESR. Capacitors designed for low-impedance switching power supplies are
especially suitable. The ESR of the capacitor affects the
output ripple voltage. Please refer to the table below for
the names of products made by various manufacturers.
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.
(6) Insulation
This product is not insulated on the primary and secondary sides, and there is a danger of electrical shock if it is
(7) Connections with other devices
Devices using this product should not be connected to
other devices. If connected, insulation should be provided.
Regulator ICs
Electrical characteristic curves
External dimensions (Units: mm)