Regulator ICs
AC / DC converter unit
BP5034A5
The BP5034A5 is an AC / DC converter that provides a direct current (5V) from commercial power supply (100V , AC),
with a small number of external components required. Using this IC, a compact microcontroller-based device can be
configured without a transformer.
Applications
Power supplies for vacuum cleaners, rice cookers, electric pots, steam irons, telephones, electric heaters, lighting equipment, gas leakage alarms, and sensors
Features
1) Smaller and lighter than transformers.
2) Wide range of input voltage (80 120V , AC).
3) Few external components required.
4) Power supply board is resistant to impacts because
a transformer is not used.
5) The hybrid IC allows easy assemblage of components.
Absolute maximum ratings (Ta = 25C)
Electrical characteristics (unless otherwise noted, Ta = 25C)
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Regulator ICs BP5034A5
Measurement circuit
Basic circuits
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∗1 Pin 6 is the COMMON pin and is connected internally to pin 5.
Use eitcher both, or one or the other, as the COMON pin. Keep
open the other pins that are not used.
Regulator ICs BP5034A5
Application example
Example of a vacuum cleaner application
The diode bridge, which draws out a zero-cross signal, is not required if a zero-cross signal is not used.
Example of a rice cooker application
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Regulator ICs BP5034A5
Selecting attached components
(1) Diodes
Use rectifier diodes with the following absolute maximum
ratings: minimum peak reverse voltage is 400V, the
mean rectifying current is more than 0.5V , and minimum
peak forward surge current is 20A. For example,
1SR35-400A is recommended.
(2) Input voltage smoothing capacitor
When the capacitance of this capacitor is increased, the
output voltage is stabilized but the start-up rush current
is increased. The waveforms of rush currents for capacitance values of 3.3µF (Fig. 5) and 10µF (Fig. 7) are
shown in Figs. 6 and 8, respectively . The recommended
capacitance is plotted against the output current in Fig.
9. The capacitor must have a withstand voltage of at least
200V .
(3) Output voltage smoothing capacitor
Use a capacitor with a small ESR. Specifically , a low-impedance capacitor for power supply switching is recommended. The capacitor’s ESR affects the output ripple
voltage. Capacitor products are listed below for reference.
Application circuit 1 (C
Rush current waveform
IN = 3.3µF)
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Regulator ICs BP5034A5
Application circuit 2 (CIN = 10µF)
Rush current waveform
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Regulator ICs BP5034A5
Operation notes
(1) Output current should be reduced with increasing
ambient temperature.
(2) Pins 3 and 7 are internally connected. Use the IC
with these pins OPEN.
(3) Overcurrent and short-circuit load
The overcurrent protection circuit limits the current to
about 160mA with a curve shape of “inverted -L” in the
voltage-current graph. The IC may be damaged if the
duration of intermittent overcurrent flows of more than
100mA exceeds 1 minute in total at 25C. Be sure to take
safety measures such as fusing if short-circuit loads or
Conditons A R2 = 0 (Ω), C = 200pF
overcurrent is probable. Though a 0.5A continuous break
fuse is recommended, careful selection should be made
according to the loading condition.
(4) Regulations governing electrical products
A single IC (BP5034A5) unit is not subject to the Regulations on Electrical Appliances. An application for approval should be based on an assembled unit.
(5) Surge tolerance
Results of electrostatic breakdown tests are shown in
Fig. 11. The test methods are based on EIAJ ED-4071
and C-111.
Conditions B R2 = 1.5 (kΩ), C = 100pF
Measurement circuit
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Regulator ICs BP5034A5
(6) Pin noise voltage
Results obtained by using the Measurement circuit of Fig. 13 are shown in Fig. 12.
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Regulator ICs BP5034A5
Electrical characteristic curves (Measurement circuit is Fig. 8)
External dimensions (Units: mm)
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