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Si3452-B01-GM Fiches technique(PDF) 7 Page - Silicon Laboratories |
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Si3452-B01-GM Fiches technique(HTML) 7 Page - Silicon Laboratories |
7 / 36 page Si3452/3 Rev. 1.0 7 Table 6. VOUT Drive and Power-on Specifications Description Symbol Test Conditions Min Typ Max Unit Max output resistance (port on) RON IPort ≤ 720 mA — 0.3 0.6 Ω Current limit ILIM 1x mode, Vport =VEE + 1 V 400 425 450 mA Change in current limit I LIM 1x mode, Vport =VEE + 1V to –30V 1 –2 — 2 % Current limit ILIM 2x mode, Vport =VEE + 1 V 800 860 920 mA Change in current limit I LIM 2x mode, Vport =VEE + 1V to –40V 2 –2 — 2 % Current limit ILIM 1x mode or 2x mode, Vport =–10 V 60 — — mA Overload current threshold ICUT Class 0 Class 1 (class policing enabled)3 Class 2 (class policing enabled)3 Class 3 Class 44 350 91 160 350 600 — — — — — — — — — — mA Over current time limit5 TOVLD Load current ≥ I CUT or ILIM 50 — 75 ms VOUTn turn-on slew TRISE 10% to 90% 15 70 — µs Power turn on timing TPON Time from end of valid detect to power on —— 400 ms VOUTn leakage current IOUT_LEAK Port in shutdown — — 10 µA Notes: 1. TJ >25 °C, –35 V over the full temperature range. 2. 1x mode current limit is enforced during the 60 ms TSTART time. 3. In auto mode, class policing is automatically enabled. In manual mode, ICUT must be programmed manually. See "5.4. Port Configuration (Registers 0x0A–0x11)" on page 18 for more information. 4. 600 mA is consistent with the IEEE 802.3at draft standard. ICUT is user-programmable in 3.2 mA increments to over 800 mA for non-standard applications. 5. For 2x mode and extreme overload or short-circuit events, TOVLD will dynamically decrease to prevent excessive FET heating. This is consistent with the 802.3at draft. Table 7. DC- and dV/dt Disconnect Specifications Description Symbol Test Conditions Min Typ Max Unit Load current to prevent disconnect ION 10 — — mA Load current to guarantee disconnect IOFF dc disconnect — — 5 mA dV/dt disconnect — — 2 mA Disconnect delay TDCDV_DLY Time from IOFF load current to port turn off 300 — 400 ms |
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