PDF《IEEE 802.3af/at 兼容、用电设备接口控制器,》

10 FA Effective Differential Input Resistance dR VIN = 1.4V up to 10.1V with 1V step, VDD = RTN = WAD = PG = 2EC (Note 5) 23.95 25.00 25.5 kI CLASSIFICATION MODE Classification Disable Threshold VTH,CLS VIN rising (Note 6) 22.0 22.8 23.6 V Classification Stability Time 0.2 ms Classification Current ICLASS VIN = 12.5V to 20.5V, VDD = RTN = WAD = PG = 2EC Class 0, RCLS = 619I

0 3.96 mA Class 1, RCLS = 117I 9.12 11.88 Class 2, RCLS = 66.5I 17.2 19.8 Class 3, RCLS = 43.7I 26.3 29.7 Class 4, RCLS = 30.9I 36.4 43.6 Class 5, RCLS = 21.3I 52.7 63.3 TYPE

2 (802.3at) CLASSIFICATION MODE Mark Event Threshold VTHM VIN falling 10.1 10.7 11.6 V Hysteresis on Mark Event Threshold 0.84 V Mark Event Current IMARK VIN falling to enter mark event, 5.2V P VIN P 10.1V 0.25 0.85 mA Reset Event Threshold VTHR VIN falling 2.8

4 5.2 V POWER MODE VIN Supply Voltage Range

60 V VIN Supply Current IQ Measured at VDD 0.27 0.55 mA IEEE 802.3af/at兼容、用电设备接口控制器, 集成功率MOSFET MAX5969A/MAX5969B

3 ELECTRICAL CHARACTERISTICS (continued) (VIN = (VDD - VSS) = 48V, RDET = 24.9kω, RCLS = 619ω. RTN, WAD, PG, and 2EC unconnected, all voltages are referenced to VSS, unless otherwise noted. TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VIN Turn-On Voltage VON VIN rising MAX5969A 34.3 35.4 36.6 V MAX5969B 37.2 38.6

40 VIN Turn-Off Voltage VOFF VIN falling

30 V VIN Turn-On/-Off Hysteresis (Note 7) VHYST_UVLO MAX5969A 4.2 V MAX5969B 7.3 VIN Deglitch Time tOFF_DLY VIN falling from 40V to 20V (Note 8)

30 120 Fs Inrush to Operating Mode Delay tDELAY tDELAY = minimum PG current pulse width after entering into power mode

80 96

112 ms Is........