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TPS23785BPWPR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS23785BPWPR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 47 page  TPS23785B www.ti.com SLUSB90A – DECEMBER 2012 – REVISED DECEMBER 2012 CLS A resistor from CLS to VSS programs the classification current per the IEEE standard. The PD power ranges and corresponding resistor values are listed in Table 1. The power assigned should correspond to the maximum average power drawn by the PD during operation. High-power PSEs may perform two-event classification if Class 4 is advertised by the PD. The TPS23785B presents the same (resistor-programmed) class each cycle per the standard. Table 1. Class Resistor Selection PD INPUT POWER RESISTOR CLASS NOTES MINIMUM MAXIMUM ( Ω) (W) (W) 0 0.44 12.95 1270 Minimum may be reduced by pulsed loading. Serves as a catch-all default class. 1 0.44 3.84 243 2 3.84 6.49 137 3 6.49 12.95 90.9 4 12.95 25.5 63.4 Not allowed for IEEE 802.3-2008. Use to indicate a Type 2 PD (high power) per IEEE 802.3at. CS The CS (current-sense) input for the dc/dc converter should be connected to the high side of the switching MOSFET’s current sense resistor (RCS). The current-limit threshold, VCSMAX, defines the voltage on CS above which the GATE ON time will be terminated regardless of the voltage on CTL. The TPS23785B provides internal slope compensation (150 mV, VSLOPE), an output current for additional slope compensation, a peak current limiter, and an off-time pull-down to this pin. Routing between the current-sense resistor and the CS pin should be short to minimize cross-talk from noisy traces such as the gate drive signal. CTL CTL (control) is the voltage-control loop input to the PWM (pulse width modulator). Pulling VCTL below VZDC (zero duty cycle voltage) causes GATE to stop switching. Increasing VCTL above VZDC raises the switching MOSFET programmed peak current. The maximum (peak) current is requested at approximately VZDC + (2 × VCSMAX). The ac gain from CTL to the PWM comparator is 0.5 V/V. The total internal divider resistance from CTL to ARTN is approximately 100 k Ω. Use VB as a pull up source for CTL. Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 11 |
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