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MAX5987A Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX5987A Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 24 page MAX5986A/MAX5986B/MAX5987A IEEE 802.3af-Compliant, High-Efficiency, Class 1/ Class 2, PDs with Integrated DC-DC Converter 6 Maxim Integrated ELECTRICAL CHARACTERISTICS (continued) (VDD = 48V, RSIG = 24.9kω, LED, VCC, SL, ULP, WK, RESET, LDO_OUT unconnected, WAD = LDO_EN = LDO_IN = PGND = GND, C1 = 68nF, C2 = 10µF, C3 = 1µF (see Figure 3), VFB = VAUX = 0V, LX unconnected. All voltages are referenced to GND, unless otherwise noted. TA = TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) FB Input Bias Current IFB VFB = 1.224V 10 200 nA PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUTPUT VOLTAGE Output Voltage Range VOUT MAX5986A/MAX5987A 3.0 5.6 V MAX5986B 5.4 14 Cycle by Cycle Overvoltage Protection VOUT-OV Rising (Note 7) 100.5 100.3 108 % Falling (Note 7) 98.5 INTERNAL COMPENSATION NETWORK Compensation Network Zero- Resistance RZERO 200 kI Compensation Network Zero- Capacitance CZERO 150 pF CURRENT LIMIT Peak Current-Limit Threshold IPEAK-LIMIT MAX5986A 1.45 64 A MAX5986B CLASS2 = GND 0.75 0.81 CLASS2 = VDRV 0.85 0.94 MAX5987A CLASS2 = GND 1.45 1.64 CLASS2 = VDRV 1.66 1.79 Runaway Current-Limit Threshold IRUNAWAY- LIMIT MAX5986A 1.9 A MAX5986B CLASS2 = GND 0.93 CLASS2 = VDRV 1.07 MAX5987A CLASS2 = GND 1.9 CLASS2 = VDRV 2.2 Valley Current-Limit Threshold IVALLEY- LIMIT MAX5986A/MAX5987A 1.5 A MAX5986B 0.75 ZX Threshold IZX 25 mA TIMINGS Switching Frequency fSW MAX5986A 245 275 305 kHz MAX5986B/MAX5987A 190 215 238 Frequency Foldback fSW-FOLD MAX5986A 122.5 137.5 152.5 kHz MAX5986B/MAX5987A 95 107.5 119 Consecutive ZX Events for Entering Foldback 8 Events Consecutive ZX Events for Exiting Foldback 8 Events |
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