PS224L Datasheet, PDF (9/11 Pages) Silicon Touch Technology Inc. – Over/Under-voltage protection and lock out

Application
Typical 4 rails SPS
S.P.S. Secondary Side
+3.3V Coil
+12V₍₁₎ Coil
+12V₍₂₎ Coil
R_S5
R_S33
R_S12(1)
R_S12(2)
PS224L
+5V Output
+3.3V Output
+12V₍₁₎ Output
+12V₍₂₎ Output
=
or
+5V_SB
1K
PSON
1 PGI
PGO 16
2 GND
Vcc 15
3 FPO/
VS5 14
4 PSON/ VS33 13
5 IS12A VS12A 12
6 RI
IS33 11
7 IS12B
IS5 10
8 VS12B Pext 9
PS224
PGO
+5V_SB
Pext
Notes:
1. Zener diode or resistor or both of them can be used in component X.
2. The bypass capacitor C_by suggests to be 0.1uF~ 10uF and layout nearby pin VCC.
3. The recommend sense values of R_S12(1), R_S12(2), R_S5 and R_S33 are ≥ 0.002Ω.
4. Over-Current Protection design example:
(1)
I _ref
=
20μA , R_I
= ^VRI
I _RI
= ^1.25 = 62.5K (Ω)
20μ
(2) R_S5=0.002 Ω , ΔV_5V = 0.002 × I_+5V = R_OC5 × 8 × I_ref
(3)
If +5V OCP trip point is 20A,
R_{OC 5}
=
0.002 × 20
8 × 20μ
=
250(Ω)
4-Channel Secondary Monitoring IC Version：A.002
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