Regulator ICs
AC / DC converter unit
BP5034A24
The BP5034A24 is an AC / DC converter which can be used to supply direct current (24V, DC 50mA) voltage from
a commercial power supply (100V AC) with a small number of attachments. Using this unit enables simple, easy drive
of sets using microcomputers, without using a transformer. It also allows the board in the set to be kept compact and
lightweight.
Applications
Power supplies of electric rice cookers and hot water pots, irons, electric carpets and other small household appliances;
power supplies of illumination devices, fire and smoke alarms, sensors, and other warning devices
Features
1) Smaller and lighter weight than transformer systems.
2) Wide input voltage range. (80 to 120V for AC voltage
conversion, 113 to 170V for DC voltage input)
3) DC voltage source (24V, 50mA) can be easily configured, with few attachments.
4) Since no transformer is used, the power supply board
is less vulnerable to splitting or cracking from impact
or shock.
5) Hybridization of the IC simplifies the manufacturing
process for power supply circuit boards, and improves mass production capability of sets.
Absolute maximum ratings (Ta = 25C)
Recommended operating conditions
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Regulator ICs BP5034A24
Electrical characteristics (Ta = 25C)
Pin descriptions
Measurement circuit
Use a low-impedance product for switching power supplies for the output capacitor.
∗1 Pin 6 is the COMMON pin and is connected internally to pin 5. Use either both, or one or the other, as the COMMON pin. Keep open
the other pins that are not used.
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Regulator ICs BP5034A24
Basic power supply circuit
Half wave rectification circuit Full wave rectification circuit
Application example
Example using electric rice cooker
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Regulator ICs BP5034A24
Selecting attached components
(1) Diodes
The rectifying diodes used should fulfill the following conditions.
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 . One example of a product which meets
these standards is the 1SR35-400A.
(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. Please refer to Figure
5 for examples of recommended capacitance values.
(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.
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) Over current and shorted circuit
The over current limit is a drooping model. At 25C, if
over 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
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being shorted or over current being produced, always
use a protective device such as a fuse.
The fuse should have a fusion current of 0.5A.
(4) Avoid subjecting this product to strong impact.
(5) 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.
(6) Insulation
This product is not insulated on the primary and secondary sides, and there is a danger of electrical shock if it is
touched.
Regulator ICs BP5034A24
(7) Connections with other devices
Devices using this product should not be connected to other devices. If connected, insulation should be provided.
(8) Pin noise voltage
The test circuit diagram below (Figure 7) was used in the test whose results are shown in Figure 6.
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Regulator ICs BP5034A24
Electrical characteristic curves (measurement circuit is Fig 7)
External dimensions (Units: mm)
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