PS222S中文资料

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 “I ref“ 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

Block Diagram

ISX

Timing Chart

FPO/

PGI

Vcc

ISx VS12 IS12 VS5 IS5 VSx

VS33 IS33

PGO

UVP/OVP/OCP

protect

PSON/ turn on AC turn on

PSON/ turn off PSON/ turn on AC turn off

V PGI

Pin Descriptions

Pin No PIN NAME Descriptions

1 PGI Power good input signal pin

GND Ground

2

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 Rating Unit

°C

Storage Temperature (T stg) -40to+125

°C

Operating Temperature (T opr) -30to+90

V Supply Voltage (V CC) VCC/VSx -0.5to+16.0

ISX, VS12, IS12 -0.5to+16.0 V

VS5, IS5 -0.5to+9.0 V

Input Voltage Range (V I)

VS33, IS33 -0.5to+7.0 V

V

PGI -0.5to+16.0

V

PSON/ -0.5to Vcc+0.5

V

FPO/ -0.5

to+16.0 Output Voltage Range (V O)

PGO-0.5 to Vcc+0.5 V

uA

Output Current for RI(I RI) RI12.5to62.5

PSON/, PGO>5000 V

FPOB, VS12>2000 V

ESD Susceptibility* (V ESD)

PGI, IS12, VS5>3000 V

Others>4000 V

* Human Body Model (HBM).

Electrical Characteristics , Vcc=12V, T a = Full range. (unless otherwise specified)

Power Supply Section

Parameter Conditions

MIN TYP MAX Unit

Supply Voltage 4.2 5.0 16.0 V Supply Current

V PSON/= 5V

2

3

mA

Power On Reset Threshold Voltage (V POR )

3.2

3.4 3.6 V

Power On Reset Hysteresis (V HYST ) -0.15-0.3 -0.45 V

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

Over-Voltage Threshold

VS12

13.1

13.8 14.5 V

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 Under-Voltage Threshold

VS12

8.5

9.0 9.5 V

Over-Current Section

Parameter Conditions

MIN TYP MAX Unit VSx, ISx

-5-2 1 mV VS33, IS33-5-2 1 mV VS5, IS5-5-2 1 mV Offset Voltage (OCP Comparator)

VS12, IS12

-5-2

1

mV

Constant Current Generator Voltage (V RI )

1.20

1.25 1.30 V

Electrical Characteristics (Continued)

PSON/, Analog Input

Unit

MAX

Parameter Conditions MIN

TYP

V

Threshold Voltage 1.16 1.25

1.33

mV

80

Hysteresis (V HYST) 2050

PGI, Analog Input

Unit

MAX

TYP

Parameter Conditions MIN

V

1.33

Threshold Voltage for start T d1 1.16 1.25

V

Threshold Voltage for start T d2 0.600.63

0.75

Threshold Voltage for mask OC,UV 1.05 1.13 1.21 V

Hysteresis (V HYST)* -20 -50 -80

mV

* All of the comparator for PGI input in block diagram.

PGO, Open Drain Digital Output

Unit

MAX

TYP

Parameter Conditions MIN

Leakage Current (I LKG) V PGO=5V 5 uA

Low Level Output Voltage (V OL) I SINK=10mA 0.3 V

FPO/, Open Drain Digital Output

MAX

Unit

TYP

Parameter Conditions MIN

Leakage Current (I LKG) V FPO/=5V 5 uA

Low Level Output Voltage (V OL) I SINK=10mA0.3 V

Switching Characteristics, Vcc=12V, T a = Full range.

Parameter Conditions MIN

MAX

Unit

TYP

mS

400 PGI to PGO Delay Time (T d1) 200300

mS

Short Circuit Delay Time (T d2) 4975

100

6

mS

PGO to FPO/ Delay Time (T d3) 2 4

mS

27

Over Current Delay Time (T d4) 1320

mS

PSON/ De-bounce Time (T b1) 2438

52

100

uS

FPO/ Noise De-glitch Time (T b2) 4773

uS

PGO Noise De-glitch Time (T b3) 4773

100

Application

Typical 4 rails SPS (Dual 12V OCP)

Application (Continued)

Typical 3 rails SPS (Single 12V OCP)

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) A I ref μ20=,()?===K I V R RI RI I 5.622025

.1μ

(2) R S5=0.002?,ref OC V V I R I V ××=×=?+8002.0555 (3) If +5V OCP trip point is 20A, ()?=××=

25020820

002.05μ

OC R

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 single 12VOCP protection function:

As “Typical 3 rails SPS” application circuit, the pin7(ISx) must be connected a resistor(Resistance>10k Ω) to GND or floating.

Package Specification

D

E1E

b1

A1

e

A

S

A2

θ°0.0 0.5 1.0inch

0 1025mm

15

5 20

( 14-pin DIP )

L

Seating Plane

b

e B

Dimension in mm

Symbol Dimension in inch

A 5.330 (MAX) 0.210 (MAX)

A10.380 (MIN) 0.015 (MIN)

A2 3.300

± 0.130 0.130 ± 0.005

b 1.520 (TYP) 0.060 (TYP)

b10.460 (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)

e B 9.000

± 0.500 0.355 ± 0.020

L 9.020 ± 0.500 0.130 ± 0.020

S 1.800 (TYP) 0.074 (TYP)

θ°0° ~ 15°0° ~ 15°

NOTE

Package Specification (Continued)

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.