PS222L Datasheet, PDF (10/13 Pages) Silicon Touch Technology Inc. – Over/Under-voltage protection and lock out

PS222L
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
20μ
=
62.5K
(Ω)
(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)
5. GND path:
(1) The GND path width is wider as far as it could.
(2) The better grounding ability has better performance at surge test.
6. PS222L uses single 12VOCP protection function:
As “Typical 3 rails SPS” application circuit, the pin7(ISx) must be connected a
resistor(Resistance>10kΩ) to GND OR floating.
3-Channel Secondary Monitoring IC
-9-
Version：A.002