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PS224A1
Version
: A.002
Issue Date : 2009/05/19
File Name : SP-PS224A1-A.002.doc
Total Pages : 10
4-Channel Secondary Monitoring IC
新竹市科學園區展業一路 9 號 7 樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park,
Hsin-Chu, Taiwan 300, R.O.C.
Tel886-3-5645656 Fax886-3-5645626

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點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
PS224A1
PS224A1
4-Channel Secondary Monitoring IC
General Description
PS224A1 is specially designed for switching power supply system. Four important
functions of PS224A1 are the followings: over-voltage protection, over-current
protection, under-voltage protection and power good signal generating.
OVP/UVP (Over-Voltage/Under-Voltage Protection) monitors 3.3V, 5V and dual
12V to protect our power supply and PC, FPO/ goes to high when one of these supply
voltages exceeds their normal operation voltage range.
OCP (Over Current Protection) monitors IS33, IS5, IS12A, IS12B input current
sense. An adjustable over-current condition composed of Iref and “protection current
range resistor” helps users design OCP easily.
An additional protection input pin provides the flexibility for design protection
circuit.
Power good signal generating notifies personal computer when power supply is
ready or power supply is going to shutdown, therefore it can provide a reliable power
supply environment.
Features
Over/Under-voltage protection and lock out
Over-current protection and lock out
Additional protection input
Fault protection output with open drain output stage
Open drain power good output signal for power good input
Built-in 300mS power good delay
AC on 75ms delay for UV/OC protection
38mS PSON/ control de-bounce
Wide power supply range (3.8V~16V)
Special care for AC power off
4-Channel Secondary Monitoring IC
-1-
VersionA.002

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點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
PS224A1
Block Diagram
VS12A
VS12B
VS5
VS33
IS12A
IS12B
IS5
IS33
R1
R2 Vref
R3 Vref
12 UV
12 OV
R1
R2 Vref
R3 Vref
12 UV
12 OV
R4
R5 Vref
R6 Vref
5 UV
5 OV
delay
14uS
38mS
De-bounce
SQ
R
delay
H : 4mS
L : 4.5uS
1MΩ
FPO/
VCCI
Vref
VCC
30KΩ
2KΩ
PSON/
4.5V
90KΩ
delay
H : 75mS
L : 4.5uS
PGI
Selection
PGI
R7
R8 Vref
R9 Vref
3.3 UV
3.3 OV
Step Down
to near 2.5V
Iref X 8
Step Down
to near 2.5V
Iref X 8
Step Down
to near 2.5V
Iref X 8
Step Down
to near 2.5V
Iref X 8
VCCI
12 OC
VCCI
12 OC
delay
3mS
delay
VCCI H : 20mS
5 OC
L : 4.5uS
VCCI
3.3 OC
1.25V
delay
73uS
De-bounce
delay
H : 300mS
L : 4.5uS
3mS
VCCI
1MΩ
1.25V
Power On
Reset
POR
Constant Current
Source Iref
PGO
Pext
RI
Internal
Power
VCCI = 4V
Band-Gap
Reference
Vref
1.25V
Clock
Generator
VCC VCC
CLK GND
4-Channel Secondary Monitoring IC
-2-
VersionA.002