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TPS23785B Datasheet(PDF) 10 Page - Texas Instruments |
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TPS23785B Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 47 page  ( ) ( ) BLNK BLNK R k = t ns W ( ) ( ) APD1 APD2 ADPTR_ON APDEN APDEN APD1 APD2 ADPTR_OFF APDEN APDH APD2 R = R V V V R + R V = V V R ´ - ´ - TPS23785B SLUSB90A – DECEMBER 2012 – REVISED DECEMBER 2012 www.ti.com Detailed Pin Description See the Typical Application Diagram for component reference designators (RCS for example), and the Electrical Characteristics table for values denoted by reference (VCSMAX for example). Electrical Characteristic values take precedence over any numerical values used in the following sections. APD APD forces power to come from an external adapter connected from VDD1 to RTN by opening the hotswap switch, disabling the CLS output, and enabling the T2P output. A resistor divider is recommended on APD when it is connected to an external adapter. The divider provides ESD protection, leakage discharge for the adapter ORing diode, and input voltage qualification. Voltage qualification assures the adapter output voltage is high enough that it can support the PD before the PoE current is cut off. Select the APD divider resistors per Equation 1 where VADPTR-ON is the desired adapter voltage that enables the APD function as adapter voltage rises. (1) SLVA306A (or most recent) provides a sample calculation. Place the APD pull-down resistor adjacent to the APD pin. APD should be tied to ARTN when not used. BLNK Blanking provides an interval between GATE going high and the current-control comparators on CS actively monitoring the input. This delay allows the normal turn-on current transient (spike) to subside before the comparators are active, preventing undesired short duty cycles and premature current limiting. Connect BLNK to ARTN to obtain the internally set blanking period. Connect a resistor from BLNK to ARTN for a more accurate, programmable blanking period. The relationship between the desired blanking period and the programming resistor is defined by Equation 2. (2) Place the resistor adjacent to the BLNK pin when it is used. 10 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated |
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