‘Isolated’ refers to a circuit separated from the AC line in order to prevent electric shock. A ‘non-isolated’ circuit is one not shielded from the AC power source, making electrocution possible. Applications requiring isolation circuitry include TVs and A/V sets. ROHM offers a lineup of power modules (i.e. BP5710-1, BP5716, BP5729) optimized for isolated equipment. A number of consumer devics – mainly appliances – typically are not isolated, ranging from washing machines and hot pots to rice cookers and air cleaners.

Since the primary side connects to the AC line, the BP5034D12 is considered to be non-isolated.

Yes, our power modules are used in a number of continuous power applications, such as air cleaners, refrigerators, and gas detection systems.

Since the NC pins are open circuit (not connected), no problems should occur. However, please take into account creepage (distance).

The BP5037B12 is a chopper-type system utilizing an external coil. Please refer to the information below.

The output voltage will decrease.

Not likely, since the surface temperature of the BP5034D12 will be 86ºC at a load current of 0.1A. However, the peripheral (circuit) conditions have a large effect on whether a component fails or not. Therefore, the characteristics should be evaluated under actual operating conditions.

Overcurrent protection.

No ROHM power supplies are UL-rated. However, the board and resin mold used in the power supplies are UL certified, and all power modules should pass UL testing if submitted by the customer. (Customers who have obtained UL certification using ROHM products exist)

UL94 V-0

20kV/mm+

Yes, testing has been performed on the both the primary and secondary stages. This applies not only to the BP5710-1, but to all isolated types.

Please refer to the block diagram of the BP5033-12 below.

Daito Communications’ BD10 400VDC/1A fuse is recommended. Please contact the manufacturer for more information.

170V and greater

Yes.

No.

In order to prevent possible combustion in the event of component failure.

The coil direction will affect the switching frequency, which can reach audible levels, resulting in ringing sounds.

The system utilizes a ‘self-excitation’ method, whereby the coil generates magnetic flux, which can affect the drive circuit, resulting in a change in the oscillation frequency.

No.

If the output current is small no problems should occur. However, the permissible ripple current margin should be verified.

The output voltage capacitor will affect the output ripple voltage. Typically, the lower the voltage resistance the greater the ESR and larger the output ripple voltage. Please verify the performance under actual operating conditions. Please note that the permissible ripple current will also decrease. Therefore, this characteristic should also be confirmed in the actual set.

No.

No combustion will occur during open/short conditions.

The transformer is a custom model (SRW25ES-X48V015) from TDK. Please contact the manufacturer for inquiries relating to mass production.

The transformer is a TDK Y05103-3 unit. Since it is a custom product, the manufacturer should be contacted for further inquiries.