SITI PS236

PS236
Version
Issue Date
File Name
Total Pages
: A.001
: 2005/11/16
: SP-PS236-A.001.doc
: 13
3-Channel Secondary Monitoring IC
With an Additional 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
PS236
PS236
3-Channel Secondary Monitoring IC
With an Additional OCP Channel
General Description
PS236 is specially designed for switching power supply system. Four important
functions of PS236 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 13V 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, IS13 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 additional VSX 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 3mS delay for UV/OC protection
17uS de-bounce for noise immunity
Wide power supply range (4.2V~18V)
Special care for AC power off
Version：A.001
3-Channel Secondary Monitoring IC
-1-
PS236
Block Diagram
Vcc / VSx
VS13
159KΩ
VCCI
6.5KΩ
13 UV
Vref
FPO/
VCCI
17uS
De-bounce
13 OV
14.5KΩ Vref
S Q
R
1MΩ
POR
VS5
64.5KΩ
VCCI
6KΩ
5 UV
Vref
VCCI
5 OV
VCCI
19.5KΩ Vref
delay
1
0
1.13V
H : 3mS
L : 4.5uS
VCCI
PGI
VS33
0.63V
R
51KΩ
VCCI
10KΩ
Q S
3.3 UV
VCCI
1.25V
Vref
VCCI
3.3 OV
29KΩ
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
IS13
13 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
Constant Current
Source Iref
RI
H : 2.5mS
L : 4.5uS
Internal
Power
Iref X 8
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
Version：A.001
3-Channel Secondary Monitoring IC
-2-
PS236
Timing Chart
Vcc
FPO/
PGI
VSx
VS13
VS5
VS33
ISx
IS13
IS5
IS33
PGO
Td1
AC
turn on
VPGI
Td2
UVP/OVP/OCP
protect
AC
turn off
UVP/OCP
protect
1.25V
1.13V
0.63V
Td1
Td2
OVP/UVP/OCP
Version：A.001
3-Channel Secondary Monitoring IC
-3-
PS236
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
N/C
N/C
5
IS13
13V over current protection input pin
6
RI
Current sense setting
7
ISx
VSX over current protection input pin
8
IS5
5.0V over current protection input pin
9
IS33
3.3V over current protection input pin
10
VS13
13V 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
+18.0
V
ISX, VS13, IS13
-0.5
to
+18.0
V
VS5, IS5
-0.5
to
+9.0
V
VS33, IS33
-0.5
to
+7.0
V
PGI
-0.5
to
+16.0
V
FPO/
-0.5
to
+16.0
V
PGO
-0.5
to
Vcc+0.5
V
12.5 to
62.5
uA
Supply Voltage
Input Voltage Range
(VCC)
(VI)
Output Voltage Range
(VO)
Output Current for RI
(IRI)
RI
Version：A.001
3-Channel Secondary Monitoring IC
-4-
PS236
Electrical Characteristics, Vcc=12V, Ta = 25˚C range. (unless otherwise specified)
Power Supply Section
Parameter
Conditions
Supply Voltage
MIN
4.2
Supply Current
TYP
Power On Reset Hysteresis (VHYST)
Unit
5.0
18.0
2
3
3.2
3.4
3.6
V
-0.15
-0.3
-0.45
V
VPSON/ = 5V
Power On Reset Threshold Voltage (VPOR)
MAX
V
mA
Over-Voltage Section
Parameter
Conditions
MIN
TYP
MAX
Unit
VS33
3.8
3.9
4.2
V
VS5
5.5
5.8
6.0
V
VS13
15.0
15.5
16.0
V
Over-Voltage Threshold
Under-Voltage Section
Parameter
Conditions
MIN
TYP
MAX
Unit
VS33
2.7
2.9
3.0
V
VS5
4.1
4.4
4.6
V
VS13
10.1
10.8
11.0
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
3
mV
VS5, IS5
-5
-2
3
mV
VS13, IS13
-5
-2
1
mV
1.20
1.25
1.30
Constant Current Generator Voltage (VRI)
V
Version：A.001
3-Channel Secondary Monitoring IC
-5-
PS236
Electrical Characteristics (Continued)
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=5mA
MIN
TYP
MAX
Unit
5
uA
0.4
V
FPO/, Open Drain Digital Output
Parameter
Conditions
Leakage Current (ILKG)
VFPO/=5V
Low Level Output Voltage (VOL)
ISINK=5mA
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)
2
3
4
mS
Over Current Delay Time (Td3)
1.6
2.5
3.2
mS
FPO/ Noise De-glitch Time (Tb1)
9
17
26
uS
PGO Noise De-glitch Time (Tb2)
47
73
100
uS
Version：A.001
3-Channel Secondary Monitoring IC
-6-
PS236
Application
Typical 4 rails SPS
S.P.S. Secondary Side
RS5
+5V Output
RS33
+3.3V Coil
+3.3V Output
RS12(1)
+13V Coil
+12V Coil
ROC5
ROC33
ROC12(1)
ROC12(2)
ROS
or
+12V Output
DV
DI
5.6K
=
+13V Output
RS12(2)
RPGO
4.7K
+5VSB
1 PGI
PGO 14
PGO
2 GND
VSx 13
+5VSB
3 FPO/
VS5 12
1K
4 N/C
VS33 11
5 IS13
VS13 10
7 ISx
IS5 8
0.1 uF
IS33 9
0.1 uF
6 RI
Cby
RI
RPGI
CPGI
PS236
0.1 uF
0.1 uF
Version：A.001
3-Channel Secondary Monitoring IC
-7-
PS236
Application (Continued)
Typical 3 rails SPS
S.P.S. Secondary Side
RS5
+3.3V Coil
+3.3V Output
RS12
+13V Coil
+13V 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
4 N/C
VS33 11
5 IS13
VS13 10
7 ISx
IS5 8
0.1 uF
IS33 9
0.1 uF
6 RI
Cby
RI
RPGI
CPGI
PS236
0.1 uF
Version：A.001
3-Channel Secondary Monitoring IC
-8-
PS236
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. PS236 uses single 13V OCP protection function:
As “Typical 3 rails SPS” application circuit, the pin7(ISx) must be connected a
resistor(Resistance>1kΩ) to VCC/VSX OR floating.
Version：A.001
3-Channel Secondary Monitoring IC
-9-
PS236
Package Specification
( 14-pin DIP )
E
E1
eB
θ°
D
A2
A
Seating Plane
A1
b1
b
0
e
S
5
10
0.0
Symbol
Dimension in mm
(MAX)
Dimension in inch
5.330
A1
0.380
(MIN)
0.015
(MIN)
A2
3.300
± 0.130
0.130
± 0.005
0.210
(TYP)
20
25
mm
1.0 inch
NOTE
(MAX)
b
1.520
(TYP)
0.060
b1
0.460
(TYP)
0.018
(TYP)
D
19.400
± 0.200
0.764
± 0.008
E
7.620
(TYP)
0.300
(TYP)
E1
6.350
± 0.130
0.250
± 0.005
e
2.540
(TYP)
0.100
(TYP)
eB
9.000
± 0.500
0.355
± 0.020
L
9.020
± 0.500
0.130
± 0.020
S
1.800
(TYP)
0.074
(TYP)
0° ~ 15°
15
0.5
A
θ°
L
0° ~ 15°
Version：A.001
3-Channel Secondary Monitoring IC
-10-
PS236
Package Specification (Continued)
( 14-pin SOP )
E
H
h x 45°
D
A
C
A1
B
θ
e
L
Seating Plane
0
5
0.0
Dimension in mm
Symbol
MIN.
0.2
MIN.
MAX.
0.0688
A
1.35
1.75
0.0532
0.1
0.25
0.0040
0.0098
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.0075
0.0098
1.27BSC
mm
0.4
Dimension in inch
MAX.
A1
e
10
inch
NOTE
0.050BSC
D
8.55
8.75
0.3367
H
5.80
6.20
0.2284
0.3444
0.2440
E
3.80
4.00
0.1497
0.1574
L
0.40
1.27
0.016
0.050
h
0.25
0.50
0.0099
0.0196
θ
0°
8°
0°
8°
Version：A.001
3-Channel Secondary Monitoring IC
-11-
PS236
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.
Version：A.001
3-Channel Secondary Monitoring IC
-12-