PS231S
Application
Typical 5 rails SPS
S.P.S. Secondary Side
RS5
+5V Output
RS33
+3.3V Coil
+12V(1) Coil
+12V(2) Coil
+12V(3) Coil
+3.3V Output
+12V(1) Output
+12V(2) Output
+12V(3) Output
RS12(1)
RS12(2)
RS12(3)
=
or
PGO
1 PGI
PGO 18
+5VSB
2 GND
3 FPO/
4 PSON/
5 IS12A
6 RI
Vcc 17
VS5 16
+5VSB
PSON
1K
VS33 15
VS12A 14
IS33 13
IS5 12
7 IS12B
8 VS12B
9 VS12C
Pext
Pext 11
IS12C 10
PS231S
Notes:
1. Zener diode or resistor or both of them can be used in component X.
2. The bypass capacitor Cby suggests to be 0.1uF~ 10uF and layout nearby pin VCC.
3. The recommend sense values of RS12(1), RS12(2), RS5 and RS33 are ≥ 0.002Ω.
4. Over-Current Protection design example:
VRI 1.25
(1) Iref = 20μA , RI =
=
= 62.5K
Ω
( )
IRI 20μ
(2) RS5=0.002Ω ,ΔV5V = 0.002×I+5V = ROC5 ×8×Iref
0.002× 20
(3) If +5V OCP trip point is 20A, ROC5
=
= 250
Ω
( )
8× 20μ
5-Channel Secondary Monitoring IC
Version：A.002
Page 7
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