PEP01-5841 Power over ethernet power supply protection Features ■ Peak pulse power: up to 2.7 kW (8/20 µs) ■ Stand-off voltage: 58 V ■ 4 unidirectional Transils™ and 4 decoupling capacitances ■ Low clamping voltage: 100 V ■ Low leakage current: – 0.2 µA at 25 °C – 1 µA at 85 °C ■ Operating Tj max: 150 °C ■ JEDEC registered package outline SO-8 package PEP01-5841 Figure 1. Gnd - - 2-3-6-7 Functional diagram PS1 1 PS2 4 PS3 5 PS4 8 Complies with the following standards ■ IEC61000-4-2 level 4 – 15 kV (air discharge) – 8 kV (contact discharge) ■ IEC61000-4-5 level 2 – +/- 1 kV 42 Ω ■ IEEE 802.3af-2003 ■ IEEE 802.3at-2008 Description The PEP01-5841 has been designed to protect power over ethernet PSE equipment against line overvoltages. It embeds 4 decoupling capacititors to stabilize power supplies. It is compatible with IEEE 802.3af-2003 and IEEE 802.3at-2008 requirements and it allows PoE based systems to be protected against both electrical overstress (EOS) and electrostatic discharges (ESD) according to IEC61000-4-5 and IEC61000-4-2. The low clamping voltage (100 V) makes it compatible with PMOS and PSE controller technologies. Developed in Planar technology, it provides high reliability level. Packaged in SO-8, this minimizes PCB consumption (footprint in accordance with the IPC 7531 standard). TM: Transil is a trademark of STMicroelectronics May 2009 Doc ID 15657 Rev 2 1/10 www.st.com 10 Characteristics 1 PEP01-5841 Characteristics Table 1. Absolute ratings (Tamb = 25 °C) Symbol Parameter Value Unit 30 kV 2700 W VPP Peak pulse voltage (IEC61000-4-2 contact discharge) PPP Peak pulse power dissipation Tstg Storage temperature range -65 to + 150 °C Tj Operating junction temperature range -55 to + 150 °C TL Maximum lead temperature for soldering during 10 s. 260 °C Table 2. Tj initial = Tamb Electrical characteristics definitions(Tamb = 25 °C) Symbol Parameter I VRM Stand-off voltage VBR Breakdown voltage VCL Clamping voltage IRM Leakage current @ VRM IPP Peak pulse current αT Voltage temperature coefficient C Capacitance RD Dynamic impedance IF VF VCL VBR VRM V I RM IR Slope = 1/ Rd I PP 8/20 µs VBR @IR (1) IRM max@VRM VCL @IPP RD(2) C αT(3) typ. max. Type 25 °C 85 °C PEP01-5841 min. µA µA V V 0.2 1 58 64.4 typ. 67.8 max. 71.2 max. mA V A Ω pF 10-4 °C 1 100 24 1.2 55 10.4 1. Pulse test: tp < 50 ms 2. To calculate maximum clamping voltage at other surge level, use the following formula: VCLmax = RD x IPP + VBRmax 3. To calculate VBR versus junction temperature, use the following formula: VBR @ TJ = VBR @ 25 °C x (1 + αT x (TJ - 25)) 2/10 Doc ID 15657 Rev 2 PEP01-5841 Figure 2. Characteristics Pulse waveform % I PP 100 Repetitive peak pulse current tr = rise time (µs) tp = pulse duration time (µs) 50 0 Figure 3. tr t tp Peak power dissipation versus initial junction temperature Figure 4. Ppp[Tj initial] / Ppp [Tj initial = 25°C] 100.0 110 Peak pulse power versus exponential pulse duration (Tj initial = 25 °C) PPP (kW) Tj initial = 25 °C 100 90 80 10.0 70 60 50 40 1.0 30 20 10 0 tp (ms) Tj T(°C) j(° 0 25 Figure 5. 100.0 50 75 100 125 150 0.1 175 Clamping voltage versus peak pulse current (exponential waveform, maximum values) 1.0E-03 Figure 6. IPP (A) 100 Tj initial = 25 °C 1.0E-02 1.0E-01 1.0E+00 1.0E+01 Capacitance versus voltage (typical values) C(pF) F=1 MHz VOSC =30 mV rms 8/20 µs Tj = 25 °C 10.0 1.0 VCL (V) 0.1 70 80 90 VR (V) 10 100 44 Doc ID 15657 Rev 2 46 48 50 52 54 56 58 3/10 Characteristics Figure 7. 1.0E+01 PEP01-5841 Peak forward voltage drop versus peak forward current (typical values) IFM (A) Figure 8. 1.00 Relative variation of thermal impedance junction to ambient versus pulse duration Zth(j-a) / Rth(j-a) With recommended pad layout 1.0E+00 Tj = 125 °C Tj = 25 °C 0.10 1.0E-01 2 VFM (V) 1.0E-02 0.0 Figure 9. 0.5 1.0 1.5 2.0 2.5 (printed ciruit board FR4, SCU = 1 cm ) 3.0 0.01 1.0E-03 1.0E-02 1.0E-01 1.0E+00 Leakage current versus junction temperature (typical values) 1.E+04 IR(nA) VR = VRM 1.E+03 1.E+02 1.E+01 1.E+00 1.E-01 1.E-02 25 4/10 Tj (°C) 50 75 100 Doc ID 15657 Rev 2 125 150 1.0E+01 tp (s) 1.0E+02 1.0E+03 PEP01-5841 Application Figure 10. Typical application circuit with PMOS integrated in PSE controller + Tx 48V Rx - I²C V1 om Co Tx Rx Gnd PS1 PoE Controller PS2 PEP01-5841 2 Application PS3 Tx PS4 Rx Tx Rx Doc ID 15657 Rev 2 5/10 Application PEP01-5841 Figure 11. Typical application circuit with external PMOS PSE controller PEP01-5841 - 48V Figure 10 and 11 shows typical application schematics of PoE network. Power sourcing equipment (PSE) allows communication and power sourcing for several power devices (PD). The number of ways is generally a multiple of 4, this optimizes the PEP01-5841 for track layout and crosstalk, as well as PCB surface occupation. This protection device has been studied to comply with the latest IEEE 802.3af-2003 requirements and to withstand the surge defined in the IEC 61000-4-5 level 4 requirements. 6/10 Doc ID 15657 Rev 2 PEP01-5841 3 Ordering information scheme Ordering information scheme Figure 12. Ordering information scheme PEP 01 - 58 4 1 Power over ethernet protection Version Stand off voltage 58 = 58 V Number of power supply lines to be protected Packaging 1 = SO-8 Doc ID 15657 Rev 2 7/10 Package information 4 PEP01-5841 Package information ● Case: JEDEC SO-8 molded plastic over planar junction ● Terminals: solder plated, solderable according to MIL-STD-750, Method 2026 ● Flammability: epoxy is rated UL94V-0 ● RoHS package In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Table 3. SO-8 dimensions Dimensions Ref. Min. Seating Plane C A2 h x 45° C A1 e b A Millimeters L k ppp C L1 Typ. Inches Max. Min. Typ. Max. A - - 1.75 - - 0.069 A1 0.1 - 0.25 0.004 - 0.010 A2 1.25 - - 0.049 - - b 0.28 - 0.48 0.011 - 0.019 C 0.17 - 0.23 0.007 - 0.009 D 4.80 4.90 5.00 0.189 0.193 0.197 E 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e - 1.27 - - 0.050 - h 0.25 - 0.50 0.010 - 0.020 L 0.40 - 1.27 0.016 - 0.050 L1 - 1.04 - - 0.041 - k 0° - 8° 0° - 8° ppp - - 0.10 - - 0.004 D 5 8 E1 1 E 4 Figure 13. Footprint recommendations Figure 14. Marking 6.8 (0.268) 0.6 (0.024) x x x xx x 4.2 (0.165) â ® 1.27 (0.050) 8/10 z z y ww Pin 1 Doc ID 15657 Rev 2 XXXX: Marking ZZ: Manufacturing location Y: Year WW: week PEP01-5841 5 Ordering information Ordering information Table 4. 6 Ordering information Order code Marking Package Weight Base qty Delivery mode PEP01-5841 58E1 SO-8 78 mg 2000 Tape and reel Revision history Table 5. Document revision history Date Revision Changes 06-May-2009 1 Initial release. 14-May-2009 2 Standards compliance updated. 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