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PM8801 Datasheet(PDF) 11 Page - STMicroelectronics |
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PM8801 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 37 page DocID018560 Rev 2 11/37 PM8801 Pin descriptions and connection diagram 7GAT1 Main gate driver output of the PWM controller. DC-DC converter gate driver output with 1A peak sink-source current capability. (5 Ω typ MOSFETs). 8VC Output of the internal high-voltage regulator. When the auxiliary transformer winding (if used) raises the voltage on this pin above the 8 V typ. regulation set point, the internal regulator will shut down, reducing the internal power dissipation. Filter this pin with a 1 µF typ connected to ground. 9GAT2 Secondary gate driver output. AUX gate driver output for active clamp or synchronous rectification designs. 1 A peak sink-source current capability (5 Ω typ MOSFETs). 10 ARTN Analog PWM supply ground. RTN for sensitive analog circuitry including the SMPS current limit amplifier. 11 RTN2 Power ground for the secondary gate driver. This pin is also connected to the drain of the internal current-limiting power MOSFET which closes VSS to the return path of the DC-DC converter. This pin must be connected to RTN1 and ARTN. 12 VSS System low potential input. Diode "OR'd" to the RJ45 connector and PSE's –48 V supply, it is the more negative input potential. 13 VDD System high potential input. The diode "OR" of several lines entering the PD, it is the most positive input potential. 14 VDD System high potential input. The diode "OR" of several lines entering the PD, it is the most positive input potential. 15 DET Detection resistor. Connect the signature resistance between DET pin and VDD. Current will flow through the resistor only during the detection phase. This pin is 100 V rated with negligible resistance with respect to the external 24.9 k Ω. 16 NC Not Connected. 17 CLS Classification resistor. Connect the classification programming resistor from this pin to VSS. 18 DIM LED dimming set. A resistor between this pin and VSS will set the duty cycle of the PWM current driving the LED connected to pin 23. 19 SA Auxiliary input startup pin. Pulling up this pin will give high priority to an auxiliary power source like an external wall adapter. Use a resistor voltage divider from the auxiliary voltage to ARTN to connect this low voltage rating pin. Connect this pin to ARTN if not used. Table 2. Pin descriptions (continued) Pin# Name Function |
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