WS3201 15W Power Over Ethernet PoE Powered Device (PD) Controller FEATURES DESCRIPTION The WS3201 is an IEEE 802. 3 af POE compliant Powered Device (PD) controller. It includes detection and classification modes as well as a 100V output pass device having a temperature compensated current limit over the specified temperature range. Thermal protection is built in to accommodate both transient and/or overload conditions, shutting the part down and protecting the input source as well as the output load depending on the particular fault conditions. Inrush current limiting is included to slowly charge the input capacitor without interruption due to die heating, a problem encountered without the current limit foldback feature. • • • • • Meets IEEE 802. 3 af Specifications 100V, 1Ω Integrate DMOS Device 440mA max, Temperature Compensated Current Limit Open Drain Power Good Output 8 pin SOIC and TSSOP Packages APPLICATIONS • • • • • VoIP Telephones Network Cards Security Camera Systems Safety Backup Power Remote Internet Power EVALUATION BOARD REFERENCE Board Number Dimensions EV8001DS-00A 2.8”x1.7”x0.8” ( LxWxH) TYPICAL APPLICATION WS3201 Rev. 0.92 12/17/2010 1 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved. WS3201– IEEE 802.3af PoE POWERED DEVICE CONTROLLER PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS (1) ILIM 1 8 VDD CLASS 2 7 NC VDD, RTN ……………………….. –0.3V to +100V PG, DET ...................................... –0.3V to +57V ILIM ................................................ –0.3V to +7V CLASS ........................................ –0.3V to +12V Junction Temperature............................... 150°C Lead Temperature .................................... 260°C Storage Temperature ..............–65°C to +150°C DET 3 6 PG Recommended Operating Conditions VSS 4 5 RTN Supply Voltage VIN .............................. 0V to 57V Output Current IOUT .............................. 0 to 0.4A Operating Temperature .............–40°C to +85°C Junction Temperature..............–40°C to +125°C TOP VIEW WS3201_PD01 Thermal Resistance Part Number* Package Temperature WS3201DS SOIC8 –40°C to +85°C * For Tape & Reel, add suffix –Z (e.g. WS3201DS–Z) For Lead Free, add suffix –LF (e.g. WS3201DS–LF–Z) (3) θJA (2) θJC SOIC8 .................................... 105 ..... 50... °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1” square of 1 oz copper. ELECTRICAL CHARACTERISTICS VDD = 48V, all voltages with respect to VSS, VSS = 0V; RDET = 26.1kΩ, RCLASS = 4.42KΩ, RILIM = 178kΩ, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Detection on VDET_ON VDD=VRTN=VPG=1.9V 1.9 V Detection off VDET_OFF VDD=VRTN=VPG=11V 11 V V Detection Detection on/off Hysteresis VDET_H Falling below 11V on Threshold 0.2 DET Leakage Current VDET_LK VDET=VVDD=57V, Measure IDET 0.1 5 µA Detection Current IDET VVDD=VRTN RDET=26.1kΩ, Measure IVDD+IRTN+IDET Classification VCLASS Output Voltage VCL Classification Current WS3201 Rev. 0.92 12/17/2010 ICLASS VDD= 3V 135 140 145 µA VDD= 10.1V 405 420 435 µA Over a Load Range of 1mA to 41.2 mA 9.6 10 10.3 V RCLASS=4420Ω, 13≤VVDD≤21V (guar by VCL) 2.2. 2.4 2.8 RCLASS=953Ω, 13≤VVDD≤21V (guar by VCL) RCLASS=549Ω, 13≤VVDD≤21V (guar by VCL) RCLASS=357Ω, 13≤VVDD≤21V (guar by VCL) 10.3 17.7 27.1 10.6 18.3 28 11.3 19.5 29.5 mA 2 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved. WS3201– IEEE 802.3af PoE POWERED DEVICE CONTROLLER RCLASS=255Ω, 13≤VVDD≤21V (guar by VCL) Classification Lower Threshold VCL_ON Classification Upper Threshold VCU_OFF VCU IC Supply Current during Classification Leakage Current WS3201 Rev. 0.92 12/17/2010 H IIN_CLASS ILEAKAGE 38 39.4 41.2 Regulator Turns on, VVDD Rising 10.2 11.3 13 V Regulator Turns off, VVDD Rising 21 21.9 23 V Hysteresis VDD = 17.5V, CLASS Floating, RTN Tied to VSS VCLASS = 0 V, VVDD = 57V 0.4 300 V 500 µA 1 µA 3 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved. WS3201– IEEE 802.3af PoE POWERED DEVICE CONTROLLER ELECTRICAL CHARACTERISTICS VDD = 48V, all voltages with respect to VSS, VSS = 0V; RDET = 26.1kΩ, RCLASS = 4.42KΩ, RILIM = 178kΩ, TA = 25°C, unless otherwise noted. Pass Device On Resistance RDS(ON) IRTN=300mA Leakage Current ISW_LK VVDD=VRTN=57V Current Limit Inrush Limit Inrush Current Termination PG ILIMIT VRTN=1V VRTN=2V, RILM=178kΩ VRTN Falling, RIPEAK = 178kΩ, Inrush StateÆ Normal Operation IINRUSH Latchoff Voltage Threshold Rising VRTN Rising Latchoff Voltage Threshold Falling PG Deglitch (4) 1.0 1.2 Ω 1 15 µA 360 120 400 150 440 180 mA mA 85 90 100 % 9.5 10 10.5 V VRTN Falling (4) 1.2 Delay Rising and Falling PDG IPG = 400 µA VPG = 57 V, VRTN = 0 V Output Low Voltage Leakage Current UVLO Voltage at VVDD (4) 75 VVDD Rising (including 1.4V Diode drop) VVDD Falling (including 1.4V Diode drop) 38 30.2 Temperature Rising 135 V 150 225 µs 0.12 0.1 0.4 1 V µA 40 31.5 42 32.8 V Thermal Shutdown Thermal Shut down Temperature TRISE Hysteresis THYS Thermal Shut down Counter TCOUNT Events Prior to Latch off Thermal Counter Reset Voltage VCRST Must Drop below Classification Range IQ(VDD) VDD = 48V, Pins 5, 6 Floating Measure IVDD (4) (4) ºC 40 ºC 8 counts 10.8 V Bias Current Operating Current 240 450 µA Notes: 4) Guaranteed by Design. WS3201 Rev. 0.92 12/17/2010 4 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved. WS3201– IEEE 802.3af PoE POWERED DEVICE CONTROLLER PIN FUNCTIONS Pin # 1 2 Name Description Startup ILIM Value Set (optional at this point). ILIM CLASS Classification Resistor. 3 4 5 6 DET VSS RTN PG 26.1kΩ Detection Resistor. Negative Power Supply Terminal. Powered Device Negative Power Terminal. Power Good Indicator. 7 8 NC VDD No Connect. Possible post-package trim input. Positive Power Supply Terminal. OPERATION The WS3201 operates in the manner described here and in the IEEE 802.3af Powered Device (PD) Specifications. This device (along with the power sourcing element (PSE)) operates as a safety device to supply potentially lethal voltages only when the power sourcing element recognizes a unique, tightly specified resistance at the end of an unknown length of Ethernet cable. A 25kΩ resistance is presented as a load to the PSE in Detection Mode, when the PSE applies two “safe” voltages of less than 10.1V each while measuring the change in current drawn in order to determine the load resistance. If the PSE “sees” the correct load, then it may either further increase the applied voltage to enter the “classification” range of operation or switch on the nominal 48V power to the load. The classification mode can further specify to the PSE the expected load range of the device under power so that the PSE can intelligently distribute power to as many loads as possible (within its maximum current capabilities). If a classification resistance is not present, the PD load is assumed to be the maximum of approximately 13 Watts. The classification mode is active between 14.5V and 20.5V. WS3201 Rev. 0.92 12/17/2010 The main power switch will pass a limited current above 31V, charging the external DC-to-DC converter’s input capacitor in a controlled manner. The charging will continue until the controlled current drops below the either an externally programmed limiting level or 450mA, depending upon the Rlim current setting resistor. The main power switch is internally thermally protected to 100V by reducing the output current using a foldback technique. The required power dissipation of the IC drops from the allowed peak value of 26W (450mA x 57V) to 0.16W ((450mA) 2 x RON) during the normal operation at turn-on. The minimum allowed capacitance of 5µF will charge in 500µs. A larger capacitor will take a proportionally longer time to charge due to the constant current charging method. If a. A capacitor that is too large will overheat the part and force it into thermal shutdown. The IC will reattempt charging for a number of cycles but ultimately will be shut down until the input voltage from the PSE is recycled. This is the way the IC protects itself under overload and/or shorted conditions. 5 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved. WS3201– IEEE 802.3af PoE POWERED DEVICE CONTROLLER BLOCK DIAGRAM VDD VIN DETECTION 2.7V - 10.1V CLASSIFICATION 14.5V - 20.5V Enable Chip PG DET HV CONTROL LOGIC AND GATE DRIVE ILIM VSTARTUP Startup Resistor RTN HV CLASS Optional Classification Resistor RSENSE VSS Figure 1—PD Block Diagram WS3201 Rev. 0.92 12/17/2010 6 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved. WS3201– IEEE 802.3af PoE POWERED DEVICE CONTROLLER PACKAGE INFORMATION SOIC8 WS3201 Rev. 0.92 12/17/2010 7 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved. WS3201– IEEE 802.3af PoE POWERED DEVICE CONTROLLER TSSOP8 PACKAGE OUTLINE DRAWING FOR 8-TSSOP MF-PO-D-0038 revision 0.0 8 0.65 BSC 0.40 TYP 2.90 3.10 5 1.60 TYP 4.30 4.50 PIN 1 ID 1 5.80 TYP 6.20 6.60 4 TOP VIEW RECOMMENDED LAND PATTERN 0.80 1.05 1.20 MAX SEATING PLANE 0.19 0.30 0.65 BSC 0.09 0.20 0.05 0.15 SEE DETAIL "A" FRONT VIEW SIDE VIEW NOTE: GAUGE PLANE 0.25 BSC 0o-8o 0.45 0.75 DETAIL ―A‖ 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION AA. 6) DRAWING IS NOT TO SCALE. NOTICE: The information in this document is subject to change without notice. Please contact WST for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating WST products into any application. WST will not assume any legal responsibility for any said applications. WS3201 Rev. 0.92 12/17/2010 8 www.wst-micro.com WST Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 WST. All Rights Reserved.