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RDR-91 12 V, 1 A, Universal Input Supply
11-Feb-13
15 Extended and Reduced Current Limit (I LIMIT ) Operation
Capacitors (C8 and C9 on the BOM in Section 6) can be added to the board to try out the
I LIMIT+1 and I LIMIT–1 operation of TNY278PG. When C7 (0.1 ? F) is replaced with a 10 ? F
capacitor (C9), the TNY278PG will operate in the I LIMIT+1 mode, which increases the
maximum primary current limit from the standard maximum limit of 0.55 A to 0.65 A
(equal to that of a TNY279PG). This allows a TNY278PG to deliver from 15% to 25%
more output power (depending on the output voltage and current).
CAUTION: Because RD-91 was designed for standard I LIMIT operation, It should not be
loaded with more than 1.25 A at an elevated temperature for very long (a few minutes)
when verifying the performance of TNY278PG in the I LIMIT+1 mode, since the other power
components (transformer, input bulk capacitors, output diode, output capacitors and
primary clamp network) are not sized for sustained operation at more than 12 W.
When C7 is replaced with a 1 ? F capacitor (C8), the TNY278PG will operate in the I LIMIT–1
mode, which reduces the maximum current limit from the standard maximum limit of
0.55 A to 0.45 A (equal to that of a TNY277PG). Although this reduces the maximum
output power that the supply can deliver, it typically will increase the efficiency, especially
at lower output power levels. To take the fullest advantage of the increase in efficiency
that can be obtained from I LIMIT–1 operation, the power transformer would need to be
redesigned slightly.
16 TNY277PG and TNY279PG Operation in RD-91
A TNY277PG device used in the I LIMIT+1 mode (a 10 ? F installed in place of C7) will work
in the RD-91 reference board, and deliver output power equal to that of a TNY278PG
device. This flexibility allows a design engineer the option of using a lower cost part in
applications with less demanding thermal requirements.
A TNY279PG device used in the I LIMIT–1 mode (a 1 ? F installed in place of C7) will deliver
the same output power as a TNY278PG in the standard I LIMIT configuration. This can
improve efficiency and lower the temperature rise of the device, which can give greater
thermal margin to a design that must operate in high ambient temperature environments.
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 32 of 35
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