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# How to calculate share regulation in SMPS?

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##### Newbie level 3
Hi,
Can tell me how to calculate two output (+5V and +12V) share regulation?

use -- TL431 ref.
-- scale 50:50
Thanks!!!!

Are you talking about cross regulation? That is when for example, +5V and +12V are outputs of a secondary side of a transformer. So the regulation of one voltage effects the regulation of the other.

Are you talking about loading or regulation? This is where a 5V output in a linear regulator with 12V input is effected by how much current is drawn at 5V output.
A TL431 may be used in this circuit to provide a 2.5V reference in conjuction with a voltage divider.

Can you give some more information?

Best regards,
v_c

v_c said:
Are you talking about cross regulation? That is when for example, +5V and +12V are outputs of a secondary side of a transformer. So the regulation of one voltage effects the regulation of the other.

Are you talking about loading or regulation? This is where a 5V output in a linear regulator with 12V input is effected by how much current is drawn at 5V output.
A TL431 may be used in this circuit to provide a 2.5V reference in conjuction with a voltage divider.

Can you give some more information?

Best regards,
v_c

Yes, Cross regulation (multi-output), same as desktop (switching mode power supply)
O/P1 => +12V, 10A
O/P2 => +5V, 18A
regulation within +/-5%
The transformer secondary side have two winding, one is for +12V, other is for +5V.
Thanks!!

can provide switching mode power information?
Thanks!!!!!

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