PS25A Version Issue Date File Name Total Pages : A.005 : 2012/03/28 : SP-PS25A-A.005.doc : 11 3-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. Fax：886-3-5645626 Tel：886-3-5645656 PS25A PS25A 3-Channel Secondary Monitoring IC General Description PS25A is specially designed for switching power supply system. Four important functions of PS25A 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 triple 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, IS12C 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 3-Channel Secondary Monitoring IC Version：A.005 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 1 PS25A Block Diagram VS12A R1 FPO/ delay 12 UV S Q R2 Vref 14uS 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 VS12C R1 12 UV R2 Vref R3 Vref delay 12 OV H : 75mS L : 4.5uS PGI Selection PGI 1.25V VCCI 1MΩ PGO delay 73uS De-bounce H : 300mS L : 4.5uS delay delay 3mS 3mS Pext VCCI IS12A 1.25V Step Down to near 2.5V 12 OC delay Power On Reset Iref X 8 Constant Current Source Iref Step Down to near 2.5V Internal Power 12 OC Iref X 8 VCCI = 4V VCC VCCI IS12C RI H : 20mS L : 4.5uS VCCI IS12B POR Step Down to near 2.5V 12 OC Band-Gap Reference Vref 1.25V Clock Generator CLK VCC GND Iref X 8 3-Channel Secondary Monitoring IC Version：A.005 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 2 PS25A Timing Chart Vcc PSON/ FPO/ PGI VS12A IS12A VS12B IS12B VS12C IS12C 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 0.63V 0.25V Td1 Td2 OVP 3-Channel Secondary Monitoring IC OVP/UVP/OCP/Pext OVP/OCP Version：A.005 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. OVP Page 3 PS25A 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 IS12C 12V(3) over current protection input pin 12 VS12C 12V(3) over/under voltage protection input pin 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 -0.5 to +16.0 V -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 PSON/, PGO > 4000 V FPOB, PGI , VS12A, VS12B > 2000 V VS12C, IS12A,IS12B, IS12C > 2000 V Others > 4000 V Supply Voltage (VCC) VCC VS12A, VS12B, VS12C, IS12A,IS12B, IS12C Input Voltage Range (VI) Output Voltage Range (VO) Output Current for RI (IRI) ESD Susceptibility* (VESD) * Human Body Model (HBM). 3-Channel Secondary Monitoring IC Version：A.005 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 4 PS25A Electrical Characteristics, Vcc=12V, Ta = 25°C. (unless otherwise specified) Power Supply Section Parameter Conditions MIN Supply Voltage 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 MIN VS12A/B/C Over-Voltage Threshold 13.4 TYP 14.0 MAX 14.2 Unit V Under-Voltage Section Parameter Conditions MIN VS12A/B/C Under-Voltage Threshold 10.3 TYP 10.8 MAX 11.0 Unit V PSON/, Analog Input Parameter Conditions MIN Threshold Voltage ( High ) 1.40 Threshold Voltage ( Low ) 0.85 Leakage Current (Ipson) TYP 1.50 Rpson=100Ω MAX Unit 1.60 V 1.20 V 540 uA 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 UV 1.16 1.25 1.33 V 0.15 0.25 0.35 V +/-50 +/-80 mV Threshold Voltage for mask OC +/-20 Hysteresis (VHYST)* * All of the comparator for PGI input in block diagram. 3-Channel Secondary Monitoring IC Version：A.005 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 5 PS25A 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/C Offset Voltage Constant Isink Current (ISINK) MIN TYP MAX Unit -4 0 2 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 0.3 V External Protection Detect Section Parameter Conditions MIN Threshold(VTH) TYP 1.20 +/-20 Hysteresis (VHYST) MAX Unit 1.25 1.30 V +/-50 +/-80 mV 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 Under Voltage Delay Time (Td4) 2.4 3 3.6 mS Over Current Delay Time (Td5) 13 20 27 mS Over Voltage Delay Time (Td6) 9 14 19 uS Pext Delay Time (Td7) 2.4 3 3.6 mS PSON/ De-bounce Time (Tb1) 24 38 52 mS PGO Noise De-glitch Time (Tb2) 47 73 100 uS 3-Channel Secondary Monitoring IC Version：A.005 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 6 PS25A Application Typical 3 rails SPS S.P.S. Secondary Side R S12 A +12VA Output +12VA Coil R S 12 B +12VB Coil +12VB Output R S 12 C +12VC Coil +12VC Output VDET R OC12C R OC12A R OC 12B R PGO 4.7K R PGI-1 CPGI-1 +12V SB PSON 1 PGI PGO 14 2 GND Vcc 13 3 FPO/ VS12C 12 IS12C 11 5 RI VS12A 10 C 12B- 1 0.1 uF 6 IS12B IS12A 9 7 VS12 B PEXT 8 +12V SB C 12A -1 0.1 uF 4 PSON/ PGO C 12C -1 0.1 uF 2K Pext C PGO 0.1 uF C by RI RP GI-2 CP GI-2 CP S ON 0.1 uF C 12C-2 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 = 3-Channel Secondary Monitoring IC 0.002 × 20 = 250(Ω ) 8 × 20 μ Version：A.005 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 7 PS25A Package Specification ( 14-pin DIP ) E1 E EB θ° D A2 A Seating Plane A1 b1 b e 0 S 5 10 0.0 Symbol Dimension in mm Min Normal Max Normal 25 mm 1.0 inch NOTE 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 20 Dimension in inch Min A1 θ° 15 0.5 5.334 A L 7 15 0.094 15 3-Channel Secondary Monitoring IC Version：A.005 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 8 PS25A ( 14-pin SOP ) Symbol Dimension in mm Dimension in inch Min Normal Max Min Normal Max 1.626 1.727 0.058 0.064 0.068 0.254 0.004 A 1.473 A1 0.102 b 0.330 0.406 0.508 0.013 0.016 0.020 c 0.191 0.203 0.249 0.007 0.008 0.010 D 8.534 8.661 8.738 0.336 0.341 0.344 E 3.810 3.912 3.988 0.150 0.154 0.157 e 1.270 NOTE 0.010 0.050 H 5.791 5.994 6.198 0.228 0.236 0.244 L 0.381 0.635 1.270 0.015 0.025 0.050 θ° 0 8 0 3-Channel Secondary Monitoring IC 8 Version：A.005 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 9 PS25A 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 10 Version：A.005 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