PS235S - Silicon Touch Technology Inc.

PS235S
Version
Issue Date
File Name
Total Pages
: A.002
: 2007/09/10
: SP-PS235S-A.002.doc
: 13
2-Channels 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.
Fax：886-3-5645626
Tel：886-3-5645656
PS235S
PS235S
2-Channels Secondary Monitoring IC
General Description
PS235S is specially designed for two-channel power supply systems. It provides
over-voltage protection, over-current protection, under-voltage protection, 5V/12V
output control, over-temperature protection and timing control.
PS235S makes external circuit implementation easy and meanwhile provides high
performance. It is usually complex with discrete components. since PS235S has an
internal timing control when output is protected with timing control. The problem is
solved with an internal timing control in PS235S
OVP/UVP (Over-Voltage/Under-Voltage protection) monitors 5V and 12V to
protect the power supply system. When any output feedback loop error occurs, the
output voltage will surge and thus cause damages on the system. With PS235S this
problem can be avoided since The FPO signal state changes when the supply voltages
exceeds their normal operation ranges.
OCP (Over Current Protection) monitors IS5 and IS12 input currents. The OCP
is composed of “Iref“ and “protection current range resistor”, and this adjustable
over-current condition helps users to design OCP more easily.
Features
•
•
•
•
•
•
•
•
•
•
Two winding detect function
Over/Under-voltage protection and lock out
Over-current protection and lock out
Over temperature protect protection and lock out
Fault protection output with open drain output stage
Three states LEDs driver of power supply
175mS delay for 12V/5V SPS short-circuit protect
48mS PSON/ control de-bounce
20uS de-bounce for noise immunity
Special care for AC power off
Version：A.002
2-Channels Secondary Monitoring IC
-1-
PS235S
Timing Chart
VCC
10V
PGI12
OT
PSON
FPO5
PGI5
VS12
VS5
ILOAD,5V
ILOAD,12V
FPO12
T2
AC
turn on
PSON
RESET
T3
T1
5V/12V
UVP
Occurs
T4
5V/12V
OVP
Occurs
5V
OCP
Occurs
T5
12V
Cycle
OCP
Drop
Occurs Occurs
T7
T6
OT
Occurs
T8
Brown_out
Occurs
AC
turn off
Note:
T1 = 3mS for 12V , 17mS for 5V
T2 = 48mS
T3 = 20uS
T4 = 175mS
T5 = 85mS
T6 = 175mS
T7 = 5.5mS
T8 = 2600mS
Version：A.002
2-Channels Secondary Monitoring IC
-2-
PS235S
Block Diagram
VCC
VER 070227
VCCI
OT
OT
delay
OT_D
Vref
5.5mS
20uS
De-bounce
VS12
R1
VCCI
S
R
VCCI
FPO12
F
Q
C
12 UV delay
100KΩ
Vref
R2
3mS
VCCI
12 OV
POR1
Vref
R3
TD38
VCCI
PSON
48mS
De-bounce
1.25V
VS5
6V
VCCI
R1
5 UV
VCCI
Vref
R2
52KΩ
delay
17mS
VCCI
1.25V
1
0
5 OV
Vref
delay
R3
OT_D
2600mS
Brown
out
0.63V
Q
R
C
S
POR1
G
VCCI
delay
VCCI
12 OC
1.25V
1
0
delay
PGI5
VCCI
PGI12
VCCI
85mS
0.63V
IS12
175mS
Iref X 8
VCCI
5 OC
delay
Q
R
C
S
POR1
FAU
IS5
F
175mS
Iref X 8
20uS
De-bounce
REM
VCC
STB
FPO5
VDD
G
Internal
Power
VCCI = 4V
Q S
C R
0
Power On
Reset1
Vt=3.6
POR1
Power On
Reset1
Vt=10
POR2
VCC
Band-Gap
Reference
GND
Vref
1.25V
Clock
Generator
CLK
Constant Current
Source Iref
RI
POR1
Version：A.002
2-Channels Secondary Monitoring IC
-3-
PS235S
Pin Descriptions
Pin No
PIN NAME
Descriptions
1
PGI5
+5V power good input signal pin
2
GND
Ground
3
FPO5/
Open drain output stage to control +5V output
4
FPO12/
+12V Inverted fault protection output ,open drain output stage
5
PSON
Remote ON/OFF control input pin
6
REM
+12V output state LED driver
7
STB
Standby state LED driver
8
FAU
Power fault state LED driver
9
RI
Current sense setting
10
OT
Over-temperature protection
11
IS12
12V over current protection input pin
12
VS12
12V over/under voltage protection input pin
13
IS5
5.0V over current protection input pin
14
VS5
5.0V over/under voltage protection input pin
15
VCC
Power supply
16
PGI12
+12V power good input signal pin
Absolute Maximum Ratings
Parameter
Storage Temperature
PIN / SYMBOL
Rating
Unit
(Tstg)
-40
to
+140
°C
Operating Temperature (Topr)
-25
to
+125
°C
Junction Temperature
(Tj)
Supply Voltage
(VCC)
Input Voltage Range
Output Voltage Range
Output Current for RI
150
°C
VCC
-0.5
to
+18.0
V
VS12, IS12
-0.5
to
+16.0
V
VS5, IS5
-0.5
to
+7.0
V
PGI
-0.5
to
+16.0
V
OT
-0.5
to
+16.0
V
PSON
-0.5
to
Vcc+0.5
V
FPO5
-0.5
to
Vcc+0.5
V
FPO12
-0.5
to
Vcc+0.5
V
FAU,REM,STB
-0.5
To
+7.0
V
RI
12.5
to
62.5
uA
VSAT*1
-0.5
Vcc+0.5
V
(VI)
(VO)
(IRI)
LED Drivers
Power Dissipation
PD
1.12
W
Thermal Resistance
θJA
85
° C/W
*1 FAU,REM,STB Pin
Version：A.002
2-Channels Secondary Monitoring IC
-4-
PS235S
Electrical Characteristics, Vcc=12V, Ta = -25 ° C ~125 ° C,
Power Supply Section
Parameter
Conditions
Supply Voltage (VCC)
10
Supply Current (ICC)
VPSON = 3.3
Reset Threshold Voltage
*2
MIN
HIGHÆLOW *2
2.6
TYP
MAX
Unit
15
18
V
2.5
4
mA
3.0
3.4
V
Hysteresis voltage included
Over-Voltage Section
Parameter
Conditions
Over-Voltage Threshold
MIN
TYP
MAX
Unit
VS5
5.7
6.0
6.3
V
VS12
13.4
14.0
14.6
V
Under-Voltage Section
Parameter
Conditions
Under-Voltage Threshold
MIN
TYP
MAX
Unit
VS5
3.7
4.0
4.3
V
VS12
10.0
10.5
11.0
V
Over-Current Section
Parameter
Offset Voltage
(OCP Comparator)
Conditions
MIN
TYP
MAX
Unit
VS5, IS5
-3
0
+3
mV
VS12, IS12
-4
0
+2
mV
1.21
1.27
1.33
V
Constant Current Generator Voltage (VRI)
IS5
OCP Bias Current
IS12
RI=62.5KΩ
148
158
168
uA
148
158
168
uA
States LEDs driver
Parameter
Conditions
VREM,SAT
VFAU,SAT
ILED = 20mA
VSTB,SAT
MIN
TYP
MAX
Unit
1
V
1
V
1
V
Version：A.002
2-Channels Secondary Monitoring IC
-5-
PS235S
Electrical Characteristics (Continued)
PSON, Analog Input
Parameter
Conditions
MIN
TYP
MAX
Unit
Threshold Voltage
LOWÆHIGH
1.30
1.55
1.80
V
Threshold Voltage
HIGHÆLOW
0.80
1.00
1.20
V
PGI5, Analog Input (Brown out function )
Parameter
Conditions
Threshold Voltage of PGI5
MIN
TYP
MAX
Unit
Enable
0.62
0.72
0.82
V
Brown out
1.12
1.22
1.32
V
PGI12, Analog Input (Brown out function )
Parameter
Conditions
Threshold Voltage of PGI12
MIN
TYP
MAX
Unit
Enable
0.62
0.72
0.82
V
Brown out
1.12
1.22
1.32
V
FPO5, Open Drain Output
Parameter
Conditions
MIN
TYP
MAX
Unit
Leakage Current (ILKG)
VFPO5=12V
5
uA
Low Level Output Voltage (VOL)
ISINK=10mA
0.5
V
FPO12, Open Drain Output
Parameter
Conditions
MIN
TYP
MAX
Unit
Leakage Current (ILKG)
VFPO12=12V
5
uA
Low Level Output Voltage (VOL)
ISINK=10mA
0.5
V
OTP, Analog Input
Parameter
Threshold Voltage
Conditions
LOWÆHIGH
MIN
1.28
TYP
1.34
MAX
1.40
Unit
V
Version：A.002
2-Channels Secondary Monitoring IC
-6-
PS235S
Switching Characteristics, Vcc=12V, Ta = -25 ° C ~125 ° C
Parameter
SYMBOL
MIN
TYP
MAX
2
3
4
12
17
22
Unit
Under voltage protection delay time *
T1
PSON De-bounce time
T2
34
48
62
mS
FPO12 / FPO5 noise De-glitch time
T3
10
20
30
uS
5V over current delay time
T4
135
175
215
mS
PGI12 OC/UV mask time
T5
60
85
110
mS
12V over current delay time
T6
135
175
215
mS
Over temperature protection delay time
T7
3
5.5
8
mS
Brown out delay time
T8
2000
2600
3200
mS
*
mS
T1=17mS for 5V, T1=3mS for 12V
Function Table
AC
POWER
+5V CHANNEL
+12V CHANNEL
VDD
PGI5
VDD<3.6V
x*1
3.6<VDD<10V
x
3.6<VDD<10V
x
3.6<VDD<10V
x
>10V
OC5 OV5 PSON PGI12 OC12 OV12
x
x
x
x
x
L
x
x
x
x
x
x
x
x
x
x
H
x
x
x
x
x
x
NO
x
x
x
<0.63
x
YES
x
x
x
L
NO NO
x
x
x
>0.63 YES
x
x
x
x
x
YES
x
x
x
x
NO
<0.63
x
YES
>1.27
NO
H
YES
x
>0.63
x
YES
x
x
x
x
x
x
x
x
x
x
H
<1.27
x
x
<1.27*2 x
x
L
x
x
x
TEMP
OT
x
NO
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
NO
NO
OUTPUT
CONTROL
LEDs STATE
FPO5 FPO12 STB REM FAU
H
H
L
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
L
H
H
L
H
H
L
H
H
H
L
H
H
L
H
H
L
H
H
H
L
L
H
H
H
L
H
L
H
L
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
L
H
H
H
L
L
H
H
H
L
L
H
H
H
L
*Note1: X = Do not care.
*Note2: The last two patterns only for Brown out function.
.
Version：A.002
2-Channels Secondary Monitoring IC
-7-
PS235S
Operation Description
z
Power good function pin (PGI5/PGI12)
PGI5 and PGI12 will enable the UVP and OCP function; if PGI is larger than the
trigger point, the UVP and OCP will be enabled, otherwise the UVP/OCP function will
be disabled when PGI is smaller than the trigger point. The PGI trigger point ranges
from 0.62V change to 1.27V, and it will prevent the AC cycle drop to provide a mistake
protection.
z
Fault power output (FPO5/FPO12)
The FPO5/FPO12 signals are the final protection signals; to control the 5V output and
12V output. When any power error occurs, the FPO state will change in accordance.
z Remote control ( PSON )
This pin controls the 12V output. When PSON is at logic high, FPO12 switches to
logic low. The photodiode connected to FPO12 will be turned on, which causes the
primary side PWM controller to be turned on.
z LED lights (FAU/REM/STB)
There are three indicator lights in PS235S. When FAU pin switches to logic high, it
means the power system fault occurs. When REM pin switches to logic high, it means
the power system works normally with 12V output. When STB pin switches to logic
high, it means the power system works normally with only 5V output.
z Over temperature protection (OT)
OT pin is a high impedance input connected to a comparator, and the reference
voltage is provided with the bandgap voltage which is equal to 1.34V nominally. If this
OT pin voltage is higher than 1.34V, it means the power system fails, and the FPO5
and FPO12 switch to logic low whereas FAU switches to logic high.
z Over voltage protection ( VS5/VS12 )
The VS5/VS12 pins detect the output voltage. If the 5V or 12V output over voltage is
detected, the FPO and LED indicator signals will change in accordance.
Version：A.002
2-Channels Secondary Monitoring IC
-8-
PS235S
z
Brown out function
When AC power decrease, the AC line current will increase, it may cause power coil
damage. So PS235S provides the brown out function to avoid the power supply
damaged. When PSON logic low, it monitor PGI5 and PSON logic high, it monitor
PGI12. If PGI signal < 1.22, the delay block active (2600mS), FPO will latch.
z
OCP setting
We recommend the values of RS12 ≥ 5mΩ and RS5 ≥ 10mΩ. RI pin is connected to
ground through a 62.5KΩ resistor. RI pin is a reference current generator and it can
adjust the over current trigger point. The OCP monitors the channel pass current with
VS and IS pins according to Ohm law. We hereby list the formulas for design OCP
trigger point;
1. Over-Current Protection design example:
(1) Set I ref = 20 μA , so RI =
VRI 1.27
=
= 63.5K (Ω )
I RI 20μ
(2) Set RS12=0.005 Ω , ΔV12V = 0.005 × I +12V = ROC 12 × 8 × I ref
(3) If +12V OCP trip point is 20A, ROC12 =
0.005 × 20
= 625(Ω )
8 × 20μ
2. It is recommended that R-C filters be connected to VS and IS pin, which increases
the accuracy of OCP.
z
GND path
The GND path width should be made as wide as possible.
The better grounding ability, the better performance during the surge test.
Version：A.002
2-Channels Secondary Monitoring IC
-9-
PS235S
Application Circuit
S.P.S. Secondary Side
Flyback
50mΩ
+5V
+5V SB
Flyback
2.5mΩ
+12V Output
VDET12
100 Ω
10u _
Forward
+
VCC
9.31K
Forward
VDET5
51.1KΩ
VS5 14
4
FPO12
IS5 13
5
PSON
VS12 12
6
REM
IS12 11
7
STB
OT 10
8
FAU
RI
0.1u
0.1u
+
_
+5V
9
NTC
0.1u 0.1u
PS235S
1K Ω
FPO5
+12V SB
47uF
3
100 Ω
1/4 W
0.1uF
150Ω
VCC 15
0.1u
0.1u
GND
C pgi_12
+5V
2
100Ω
0 Ω
PGI12 16
619 Ω
PSON
PGI5
100 Ω
1K Ω
+5V
1KΩ
9.31K
0.1u
C pgi_5
750 Ω
1
130KΩ
0.1u
3K Ω
Version：A.002
2-Channels Secondary Monitoring IC
-10-
PS235S
Package Specification
( 16-pin DIP )
E1
eB
E
θ°
D
A
Seating Plane
A1
b1
e
b
0
5
10
0.0
Symbol
Dimension in mm
Min
Normal
Max
0.38
eB
7.29
b
Normal
25
mm
1.0 inch
Max
0.210
0.015
8.41
9.53
0.287
0.331
0.375
0.06
0.46
0.018
D
18.67
19.18
19.69
0.735
0.755
0.775
E1
6.01
6.30
6.55
0.238
0.248
0.258
e
2.18
2.54
2.90
0.086
0.100
0.114
E
20
NOTE
Dimension in inch
Min
1.52
b1
15
0.5
5.33
A
A1
L
7.62
0.3
L
2.54
2.92
3.81
0.100
0.115
0.150
θ°
0º
7º
15º
0º
7º
15º
Version：A.002
2-Channels Secondary Monitoring IC
-11-
PS235S
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.002
2-Channels Secondary Monitoring IC
-12-