SITI PS222S

PS222S
Version
Issue Date
File Name
Total Pages
: A.003
: 2008/01/10
: SP-PS222S-A.003.doc
: 13
3-Channel Secondary Monitoring IC
With Over-Current Protection
And an Additional 12V OCP Channel
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.
Tel：886-3-5645656
Fax：886-3-5645626
PS222S
PS222S
3-Channel Secondary Monitoring IC
With Over-Current Protection
And an Additional 12V OCP Channel
General Description
PS222S is specially designed for switching power supply system. Four important
functions of PS222S are the following: 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 12V to
protect our power supply. FPO/ goes to high when one of these supply voltages
exceeds their normal operation voltage range.
OCP (Over Current Protection) monitors IS33, IS5, IS12 input current sense.
Composed of “Iref“ and “protection current range resistor”, an adjustable over-current
condition helps users design OCP easily.
An additional OCP channel helps users monitor another 12V rail output current.
Power good signal generating can notify 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
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
73uS de-bounce for noise immunity
Wide power supply range (4.2V~16V)
Special care for AC power off
3-Channel Secondary Monitoring IC
Version：A.003
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Page 1
PS222S
Block Diagram
Vcc / VSx
FPO/
73uS
De-bounce
VS12
155KΩ
VCCI
9KΩ
S Q
R
1MΩ
12 UV
Vref
delay
VCCI
12 OV
16KΩ
H : 4mS
L : 4.5uS
Vref
VCC
30KΩ
VCCI
VS5
2KΩ
PSON/
38mS
De-bounce
1.25V
58KΩ
4.5V
VCCI
90KΩ
5 UV
13.5KΩ Vref
VCCI
5 OV
VCCI
delay
18.5KΩ Vref
1
0
H : 75mS
L : 4.5uS
1.13V
VCCI
PGI
VS33
0.63V
R
38.5KΩ
VCCI
VCCI
Q S
3.3 UV
1.25V
23.5KΩ Vref
VCCI
3.3 OV
28KΩ
VCCI
Vref
1MΩ
PGO
VCCI
ISX
delay
Vcc OC
Step Down
to near 2.5V
73uS
De-bounce
H : 300mS
L : 4.5uS
Iref X 8
VCCI
IS12
12 OC
Step Down
to near 2.5V
delay
Iref X 8
Power On
Reset
VCCI
IS5
5 OC
Step Down
to near 2.5V
POR
RI
H : 20mS
L : 4.5uS
Internal
Power
Iref X 8
Constant Current
Source Iref
VCCI = 4V
VCCI
IS33
Step Down
to near 2.5V
3.3 OC
Band-Gap
Reference
Vref
1.25V
Clock
Generator
CLK
GND
Iref X 8
3-Channel Secondary Monitoring IC
Version：A.003
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Page 2
PS222S
Timing Chart
Vcc
PSON/
FPO/
PGI
VSx
VS12
VS5
VS33
ISx
IS12
IS5
IS33
PGO
Td1
Tb1
Td3
Td2
AC
turn on
VPGI
UVP/OVP/OCP
protect
PSON/
turn on
PSON/
turn off
PSON/
turn on
AC
turn off
1.25V
1.13V
0.63V
Td1
Td2
OVP
3-Channel Secondary Monitoring IC
OVP/UVP/OCP
OVP
Version：A.003
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Page 3
PS222S
Pin Descriptions
Pin No
PIN NAME
Descriptions
1
PGI
Power good input signal pin
2
GND
Ground
3
FPO/
Inverted fault protection output ,open drain output stage
4
PSON/
Remote ON/OFF control input pin
5
IS12
12V(1) over current protection input pin
6
RI
Current sense setting
7
ISx
12V(2) over current protection input pin
8
IS5
5.0V over current protection input pin
9
IS33
3.3V over current protection input pin
10
VS12
12V(1) over/under voltage protection input pin
11
VS33
3.3V over/under voltage protection input pin
12
VS5
5.0V over/under voltage protection input pin
13
VCC / VSx
Power supply
14
PGO
Power good output signal pin , open drain output stage
Absolute Maximum Ratings
Parameter
Storage Temperature
Rating
Unit
(Tstg)
-40
to
+125
°C
Operating Temperature (Topr)
-30
to
+90
°C
VCC/VSx
-0.5
to
+16.0
V
ISX, VS12, IS12
-0.5
to
+16.0
V
VS5, IS5
-0.5
to
+9.0
V
VS33, IS33
-0.5
to
+7.0
V
PGI
-0.5
to
+16.0
V
PSON/
-0.5
to
Vcc+0.5
V
FPO/
-0.5
to
+16.0
V
PGO
-0.5
to
Vcc+0.5
V
12.5 to
62.5
uA
PSON/, PGO
>
5000
V
FPOB, VS12
>
2000
V
PGI, IS12, VS5
>
3000
V
Others
>
4000
V
Supply Voltage
(VCC)
Input Voltage Range
(VI)
Output Voltage Range
(VO)
Output Current for RI
(IRI)
ESD Susceptibility*
(VESD)
RI
* Human Body Model (HBM).
3-Channel Secondary Monitoring IC
Version：A.003
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Page 4
PS222S
Electrical Characteristics, Vcc=12V, Ta = 25°
C. (unless otherwise specified)
Power Supply Section
Parameter
Conditions
MIN
Supply Voltage
4.2
Supply Current
TYP
Unit
5.0
16.0
2
3
3.2
3.4
3.6
V
-0.15
-0.3
-0.45
V
VPSON/ = 5V
Power On Reset Threshold Voltage (VPOR)
Power On Reset Hysteresis (VHYST)
MAX
V
mA
Over-Voltage Section
Parameter
Conditions
MIN
TYP
MAX
Unit
VS33
3.7
3.9
4.1
V
VS5
5.7
6.1
6.5
V
VS12
13.1
13.8
14.5
V
Over-Voltage Threshold
Under-Voltage Section
Parameter
Conditions
MIN
TYP
MAX
Unit
VS33
2.0
2.2
2.4
V
VS5
3.3
3.5
3.7
V
VS12
8.5
9.0
9.5
V
Under-Voltage Threshold
Over-Current Section
Parameter
Offset Voltage
(OCP Comparator)
Conditions
MIN
TYP
MAX
Unit
VSx, ISx
-5
-2
1
mV
VS33, IS33
-5
-2
1
mV
VS5, IS5
-5
-2
1
mV
VS12, IS12
-5
-2
1
mV
1.20
1.25
1.30
Constant Current Generator Voltage (VRI)
3-Channel Secondary Monitoring IC
Version：A.003
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V
Page 5
PS222S
Electrical Characteristics (Continued)
PSON/, Analog Input
Parameter
Conditions
High-Level Input Voltage (VIH)
MIN
TYP
MAX
1.60
Unit
V
Low-Level Input Voltage (VIL)
0.80
V
PGI, Analog Input
Parameter
Conditions
MIN
TYP
MAX
Unit
Threshold Voltage for start Td1
1.16
1.25
1.33
V
Threshold Voltage for start Td2
0.60
0.63
0.75
V
Threshold Voltage for mask OC,UV
1.05
1.13
1.21
V
Hysteresis (VHYST)*
-20
-50
-80
mV
* All of the comparator for PGI input in block diagram.
PGO, Open Drain Digital Output
Parameter
Conditions
Leakage Current (ILKG)
VPGO=5V
Low Level Output Voltage (VOL)
ISINK=4mA
MIN
TYP
MAX
Unit
5
uA
0.3
V
FPO/, Open Drain Digital Output
Parameter
Conditions
Leakage Current (ILKG)
VFPO/=5V
Low Level Output Voltage (VOL)
ISINK=6mA
MIN
TYP
MAX
Unit
5
uA
0.3
V
Switching Characteristics, Vcc=12V, Ta = 25° C.
Parameter
Conditions
MIN
TYP
MAX
Unit
PGI to PGO Delay Time (Td1)
200
300
400
mS
Short Circuit Delay Time (Td2)
49
75
100
mS
PGO to FPO/ Delay Time (Td3)
2
4
6
mS
Over Current Delay Time (Td4)
13
20
27
mS
PSON/ De-bounce Time (Tb1)
24
38
52
mS
FPO/ Noise De-glitch Time (Tb2)
47
73
100
uS
PGO Noise De-glitch Time (Tb3)
47
73
100
uS
3-Channel Secondary Monitoring IC
Version：A.003
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Page 6
PS222S
Application
Typical 4 rails SPS (Dual 12V OCP)
S.P.S. Secondary Side
RS5
+5V Output
RS33
+3.3V Coil
+3.3V Output
RS12(1)
+12V(1) Coil
+12V(2) Coil
ROC5
ROC33
ROC12(1)
ROC12(2)
ROS
or
+12V(2) Output
DV
DI
5.6K
=
+12V(1) Output
RS12(2)
RPGO
4.7K
+5VSB
1 PGI
PGO 14
PGO
2 GND
VSx 13
+5VSB
3 FPO/
VS5 12
1K
PSON
4 PSON/
VS33 11
5 IS12
VS12 10
7 ISx
IS5 8
0.1 uF
IS33 9
0.1 uF
6 RI
Cby
RI
RPGI
CPGI
CPSON
PS222S
0.1 uF
0.1 uF
3-Channel Secondary Monitoring IC
Version：A.003
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Page 7
PS222S
Application (Continued)
Typical 3 rails SPS (Only one 12V OCP)
S.P.S. Secondary Side
RS5
+3.3V Coil
+3.3V Output
RS12
+12V Coil
+12V Output
ROC5
ROC33
ROC12
=
+5V Output
RS33
or
RPGO
4.7K
+5VSB
1 PGI
PGO 14
PGO
2 GND
VSx 13
+5VSB
3 FPO/
VS5 12
1K
PSON
4 PSON/
VS33 11
5 IS12
VS12 10
7 ISx
IS5 8
0.1 uF
IS33 9
0.1 uF
6 RI
Cby
RI
RPGI
CPGI
CPSON
3-Channel Secondary Monitoring IC
PS222S
0.1 uF
Version：A.003
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Page 8
PS222S
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:
V
1.25
(1) I ref = 20 μA , RI = RI =
= 62.5 K (Ω )
I RI 20μ
(2) RS5=0.002 Ω , ΔV5V = 0.002 × I +5V = ROC 5 × 8 × I ref
(3) If +5V OCP trip point is 20A, ROC 5 =
0.002 × 20
= 250(Ω )
8 × 20 μ
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. PS222S uses only one 12VOCP protection function:
As “Typical 3 rails SPS” application circuit, the pin7(ISx) must be connected one
resistor(Resistance>10kΩ or floating) to GND.
3-Channel Secondary Monitoring IC
Version：A.003
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Page 9
PS222S
Package Specification
( 14-pin DIP )
E1
E
EB
θ°
D
A
Seating Plane
A1
b1
Symbol
Dimension in mm
Min
Normal
Max
e
Dimension in inch
Min
Normal
5.33
A
A1
b
0.38
0.210
b
1.52
0.06
0.46
0.018
18.67
E1
19.18
19.69
0.735
7.62
E
6.00
6.30
6.60
0.236
0.775
0.248
0.260
0.100
eb
7.32
9.53
0.288
L
2.54
3.81
0.100
θ°
0º
15º
0º
7º
0.755
0.300
2.54
e
NOTE
Max
0.015
b1
D
L
0.375
0.150
7º
15º
3-Channel Secondary Monitoring IC
Version：A.003
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Page 10
PS222S
Package Specification (Continued)
( 14-pin SOP )
E
H
h x 45°
D
A
C
A1
B
θ
e
L
Seating Plane
Dimension in mm
Symbol
MIN.
MAX.
Dimension in inch
MIN.
A
1.346
1.753
0.053
0.069
A1
0.102
0.254
0.004
0.01
B
0.330
0.508
0.013
0.020
C
0.190
0.250
0.0075
0.0098
e
1.27(TPY)
0.050(TYP)
D
8.534
8.738
0.336
0.344
H
5.80
6.20
0.228
0.244
E
3.80
4.00
0.150
0.157
L
0.38
1.27
0.015
0.050
h
θ
0.38(TPY)
0°
NOTE
MAX.
0.015(TYP)
8°
0°
8°
3-Channel Secondary Monitoring IC
Version：A.003
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Page 11
PS222S
The products listed herein are designed for ordinary electronic applications, such as
electrical appliances, audio-visual equipment, communications devices and so on.
Hence, it is advisable that the devices should not be used in medical instruments,
surgical implants, aerospace machinery, nuclear power control systems,
disaster/crime-prevention equipment and the like. Misusing those products may
directly or indirectly endanger human life, or cause injury and property loss.
Silicon Touch Technology, Inc. will not take any responsibilities regarding the
misusage of the products mentioned above. Anyone who purchases any products
described herein with the above-mentioned intention or with such misused
applications should accept full responsibility and indemnify. Silicon Touch Technology,
Inc. and its distributors and all their officers and employees shall defend jointly and
severally against any and all claims and litigation and all damages, cost and
expenses associated with such intention and manipulation.
Silicon Touch Technology, Inc. reserve the right to make changes to their products or
to discontinue any product or service without notice, and advise customers to obtain
the latest version of relevant information to verify, before placing orders, that
information being relied on is current and complete.
3-Channel Secondary Monitoring IC
Version：A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 12