PS252C Version Issue Date File Name Total Pages : A.001 : 2009/03/13 : SP-PS252C-A.001.doc : 10 2-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. Tel：886-3-5645656 Fax：886-3-5645626 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C PS252C 2-Channel Secondary Monitoring IC General Description PS252C is specially designed for switching power supply system. Four important functions of PS252C 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 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 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 Version：A.001 2-Channel Secondary Monitoring IC -1- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C Block Diagram VS12A R1 FPO/ delay 12 UV S Q R2 Vref 22uS R 1MΩ 12 OV R3 Vref delay 38mS De-bounce H : 4mS L : 4.5uS VS12B R1 12 UV R2 Vref R3 Vref VCC 30KΩ 12 OV VCCI 2KΩ PSON/ Vref 4.5V 90KΩ delay H : 75mS L : 4.5uS PGI Selection PGI 1.25V VCCI 1MΩ PGO delay 73uS De-bounce H : 300mS L : 4.5uS delay delay 53uS 53uS Pext VCCI IS12A 1.2V Step Down to near 2.5V 12 OC delay Power On Reset Iref X 8 Step Down to near 2.5V Constant Current Source Iref RI H : 20mS L : 4.5uS VCCI IS12B POR 12 OC Internal Power Iref X 8 VCCI = 4V VCC Band-Gap Reference Vref 1.25V Clock Generator CLK VCC GND Version：A.001 2-Channel Secondary Monitoring IC -2- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C Timing Chart Vcc PSON/ FPO/ PGI VS12A IS12A VS12B IS12B Pext PGO Td1 Tb1 Td3 Td2 AC turn on VPGI UVP/OVP/OCP Pext protect PSON/ turn on PSON/ turn off 1.25V PSON/ turn on AC turn off 1.25V Td1 Td2 OVP OVP/UVP/OCP/Pext OVP Version：A.001 2-Channel Secondary Monitoring IC -3- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C Pin Descriptions Pin No 1 PIN NAME PGI Descriptions 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 RI Current sense setting 6 IS12B 12V(2) over current protection input pin 7 VS12B 12V(2) over/under voltage protection input pin 8 Pext External protection detect input pin 9 IS12A 12V(1) over current protection input pin 10 VS12A 12V(1) over/under voltage protection input pin 11 None 12 None 13 VCC 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 -0.5 to +16.0 V VS12A, VS12B, IS12A,IS12B -0.5 to +16.0 V Pext -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 Vcc+0.5 V PGO -0.5 to Vcc+0.5 V RI 12.5 to 62.5 uA > 2000 V Supply Voltage Input Voltage Range (VCC) (VI) Output Voltage Range (VO) Output Current for RI (IRI) ESD Susceptibility* (VESD) * Human Body Model (HBM). Version：A.001 2-Channel Secondary Monitoring IC -4- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C Electrical Characteristics, Vcc=12V, Ta = 25°C. (unless otherwise specified) Power Supply Section Parameter Conditions Supply Voltage MIN 3.8 Supply Current Power On Reset Hysteresis (VHYST) MAX Unit 5.0 16.0 V 4.5 5.0 mA 3.2 3.4 3.6 V -0.15 -0.3 -0.45 V VPSON/ = 5V Power On Reset Threshold Voltage (VPOR) TYP Over-Voltage Section Parameter Conditions VS12A/B Over-Voltage Threshold MIN 13.3 TYP 13.8 MAX 14.2 Unit V Under-Voltage Section Parameter Conditions VS12A/B Under-Voltage Threshold MIN 9.8 TYP 10.2 MAX 10.6 Unit V PSON/, Analog Input Parameter Conditions Threshold Voltage ( High ) MIN TYP MAX 1.60 Unit V Threshold Voltage ( Low ) 0.75 V PGI, Analog Input Parameter Conditions Threshold Voltage for start Td1 Threshold Voltage for mask UV, OC MIN MAX Unit 1.16 1.25 1.33 V 1.16 1.25 1.33 V +/-50 +/-80 mV +/-20 Hysteresis (VHYST)* TYP * All of the comparator for PGI input in block diagram. Version：A.001 2-Channel Secondary Monitoring IC -5- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C Electrical Characteristics (Continued) PGO, Open Drain Digital Output Parameter Conditions Leakage Current (ILKG) VPGO=5V Low Level Output Voltage (VOL) ISINK=10mA MIN TYP MAX Unit 5 uA 0.3 V Over-Current Section Parameter Conditions VS12A/B Offset Voltage Constant Isink Current (ISINK) MIN TYP MAX Unit -5 0 5 mV 144 160 172 uA TYP MAX Unit FPO/, Open Drain Digital Output Parameter Conditions Leakage Current (ILKG) VFPO/=5V Low Level Output Voltage (VOL) ISINK=20mA MIN 5 uA 0.4 V External Protection Detect Section Parameter Conditions Threshold(VTH) MIN TYP 1.15 +/-20 Hysteresis (VHYST) MAX Unit 1.20 1.25 V +/-50 +/-80 mV Switching Characteristics, Vcc=12V, Ta = 25°C. Parameter Conditions PGI to PGO Delay Time (Td1) MIN TYP MAX Unit 200 300 400 mS Short Circuit Delay Time (Td2) PGI>1.25V 49 75 114 mS Short Circuit Delay Time (Td2-1) PGI<1.25V 400 500 600 mS PGO to FPO/ Delay Time (Td3) 2 4 6 mS Under Voltage Delay Time (Td4) 47 73 110 uS Over Current Delay Time (Td5) 13 20 27 mS Over Voltage Delay Time (Td6) 15 22 30 uS Pext Delay Time (Td7) 47 73 110 uS PSON/ De-bounce Time (Tb1) 24 38 61 mS PGO Noise De-glitch Time (Tb2) 47 73 100 uS Version：A.001 2-Channel Secondary Monitoring IC -6- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C Application Typical 2 rails SPS S.P.S. Secondary Side RS12 A +12VA Output +12VA Coil RS 12 B +12VB Coil +12VB Output VDET R OC12A R OC12B R PGO 4.7K R PGI-1 CPGI-1 PGO 14 2 GND Vcc 13 +5V SB 3 FPO/ None 12 PSON 4 PSON/ None 11 5 RI VS12A 10 1K C 12B-1 0.1 uF 6 IS12B IS12 A 9 7 VS12 B PEXT 8 PGO +5V SB C 12A-1 0.1 uF 1 PGI Pext C PGO 0.1 uF Cby RI RPGI-2 CPGI-2 CPS ON 0.1 uF C 12A-2 0.1 uF C 12B-2 0.1 uF 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 RS12A, RS12B 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 12V OCP trip point is 20A, ROC 5 = 0.002 × 20 = 250(Ω ) 8 × 20 μ Version：A.001 2-Channel Secondary Monitoring IC -7- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C Package Specification ( 14-pin DIP ) E E1 eB θ° D A2 A Seating Plane A1 b1 b e 0 S 5 10 0.0 Symbol Dimension in mm Min Normal A Max Normal 5.334 20 25 mm 1.0 inch NOTE Dimension in inch Min Max 0.210 0.381 A2 3.175 3.302 3.429 0.125 0.13 0.135 b 1.300 1.500 1.700 0.051 0.059 0.067 b1 0.400 0.480 0.560 0.015 0.019 D 18.669 19.495 20.320 0.735 0.768 0.800 E 7.366 7.620 7.874 0.290 0.300 0.310 E1 6.223 6.812 7.400 0.245 0.268 0.291 e 2.290 2.540 2.790 0.090 0.100 0.110 eB 8.509 9.017 9.525 0.335 0.355 0.375 0.015 L 2.540 3.175 3.810 0.100 0.125 0.150 0 7 2.390 S 0 15 0.5 A1 θ° L 7 15 0.094 15 Version：A.001 2-Channel Secondary Monitoring IC -8- 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. PS252C 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 2-Channel Secondary Monitoring IC -9-