InnoSwitch Family

 Hi Raimon,

Thank you for choosing Power Integrations. SC1223K is a multi customer-specific part number. If you could give us the following information, I would gladly help you choose an equivalent Innoswitch part for your design.

Input Voltage :

Output Voltage/s :

Output Current/s :

Efficiency Target :

End Application :

Other special requirements :

Hi Sir,

good morning

i would like to seek your advice regarding INN2003K application, i am designing a power supply for emergency light using this INN2003K, i have some few questions that i would like to check if  it is possible to apply, 2 of these questions are:

1) i have possible board layout which the INN2003K would be placed underneath the transformer, between its pins, to save space.  could there be any problems from the transformer stray magnetic field, since the device appears to be using magnetic coupling internally?

2) the quoted absolute maximum value for Vout is 15V, with a note that the current into Vout at 15V shouldnot exceed 10mA. I assume that this means Vout hassome sort of zener protection, which will protectit up to 10mA. is this correct? if so, would it be acceptable to drive it from a higher voltage if the current was limited to below 10mA? (transformer secondary forward votlage is around 20V at 255V input).

thanks

Eman

Hi emmansg,

Thank you for choosing Power Integrations. Here are my comments below:

1. I normally would not recommend placing the InnoSwitch or any other controller under a transformer. First, the magnetic field of the transformer may induce spurious signals and may interfere with the normal operation of the PSU. Another is for safety concerns. Depending on your transformer and how you place the InnoSwitch you may be violating primary to secondary isolation.

2. I need help on additional information for me to answer your question. Are you talking about a 15V battery in the emergency light which is charged by your PSU design since you mentioned that 10mA will flow "into" the 15V? I would like to know what is the load of your power supply whether it be a battery or a lamp.

Also zeners usually protect against overvoltage so I am not sure that a zener is used in your design to protect from the 10mA current.

If possible could you send your working schematic, transformer design and the PIexpert design file that you are using so I ccan help with your design?