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TPS23753APW Datasheet(PDF) 5 Page - Texas Instruments |
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TPS23753APW Datasheet(HTML) 5 Page - Texas Instruments |
5 / 30 page GATE RTN VC CS VDD VSS DEN BLNK FRS VB CTL CLS 1 2 3 4 5 6 7 8 14 13 11 10 9 12 APD VDD1 TPS23753A www.ti.com SLVS933B – JULY 2009 – REVISED JANUARY 2010 ELECTRICAL CHARACTERISTICS (continued) PoE and Control [VDD = VDD1] or [VDD1 = RTN], VVC-RTN = 0 V, all voltages referred to VSS. Typical specifications are at 25°C. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT THERMAL SHUTDOWN Turn off temperature 135 145 155 °C Hysteresis(2) 20 °C (2) These parameters are provided for reference only. DEVICE INFORMATION TOP VIEW Table 1. Terminal Functions TERMINAL I/O DESCRIPTION NO. NAME 1 CTL I The control loop input to the PWM (pulse width modulator). Use VB as a pull up for CTL. 5 V bias rail for dc/dc control circuits. Apply a 0.1 mF to RTN. VB may be used to bias an external 2 VB O optocoupler for feedback. Dc/dc converter switching MOSFET current sense input. Connect CS to the high side of RCS per 3 CS I Figure 1. Dc/dc converter bias voltage. The internal startup current source and converter bias winding output 4 VC I/O power this pin. Connect a 0.22 mF minimum ceramic capacitor to RTN, and a larger capacitor to facilitate startup. 5 GATE O Gate drive output for the dc/dc converter switching MOSFET. 6 RTN RTN is the negative rail input to the dc/dc converter and output of the PoE hotswap. 7 VSS Negative power rail derived from the PoE source. 8 VDD1 Source of dc/dc converter startup current. Connect to VDD for most applications. 9 VDD Positive input power rail for PoE interface circuit. Derived from the PoE source. Connect a 24.9 k Ω resistor from DEN to VDD to provide the PoE detection signature. Pulling this pin 10 DEN I/O to VSS during powered operation causes the internal hotswap MOSFET to turn off. 11 CLS O Connect a resistor from CLS to VSS to program the classification current per Table 2. Pull APD above 1.5 V to disable the internal PD hotswap switch, forcing power to come from an 12 APD I external adapter. Connect to the adapter through a resistor divider. Connect to RTN to utilize the internally set blanking period or connect through a resistor to RTN to 13 BLNK I/O program the blanking period. 14 FRS I/O Connect a resistor from FRS to RTN to program the converter switching frequency. Copyright © 2009–2010, Texas Instruments Incorporated Submit Documentation Feedback 5 |
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