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TPS2376DRG4 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS2376DRG4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 25 page Detailed Pin Description I (LIM) + 25000 R (ILIM) (1) data sheet TPS2375 TPS2376 TPS2377 SLVS525B – APRIL 2004 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com TERMINAL FUNCTIONS PIN NUMBER PIN NAME I/O DESCRIPTION TPS2375/77 TPS2376 Connect a resistor from ILIM to VSS to set the start-up inrush current limit. ILIM 1 1 O The equation for calculating the resistor is shown in the detailed pin description section for ILIM. Connect a resistor from CLASS to VSS to set the classification of the CLASS 2 2 O powered device (PD). The IEEE classification levels and corresponding resistor values are shown in Table 1. Connect a 24.9-k Ω detection resistor from DET to VDD for a valid PD DET 3 3 O detection. VSS 4 4 I Return line on the source side of the TPS2375 from the PSE. Switched output side return line used as the low-side reference for the RTN 5 5 O TPS2375 load. PG 6 6 O Open-drain, power-good output; active high. Used only on the TPS2376. Connect a resistor divider from VDD to VSS to UVLO - 7 I implement the adjustable UVLO feature of the TPS2376. NC 7 - No connection VDD 8 8 I Positive line from the rectified PSE provided input. The following descriptions refer to the schematic of Figure 1 and the functional block diagram. ILIM: A resistor from this pin to VSS sets the inrush current limit per Equation 1: where ILIM is the desired inrush current value, in amperes, and R(ILIM) is the value of the programming resistor from ILIM to VSS, in ohms. The practical limits on R(ILIM) are 62.5 kΩ to 500 kΩ. A value of 178 kΩ is recommended for compatibility with legacy PSEs. Inrush current limiting prevents current drawn by the bulk capacitor from causing the line voltage to sag below the lower UVLO threshold. Adjustable inrush current limiting allows the use of arbitrarily large capacitors and also accommodates legacy systems that require low inrush currents. The ILIM pin must not be left open or shorted to VSS. CLASS: Classification is implemented by means of an external resistor, R(CLASS), connected between CLASS and VSS. The controller draws current from the input line through R(CLASS) when the input voltage lies between 13 V and 21 V. The classification currents specified in the electrical characteristics table include the bias current flowing into VDD and any RTN leakage current. Table 1. CLASSIFICATION CLASS PD POWER (W) R(CLASS) (Ω) 802.3af LIMITS (mA) NOTE 0 0.44 – 12.95 4420 ±1% 0 - 4 Default class 1 0.44 – 3.84 953 ±1% 9 - 12 2 3.84 – 6.49 549 ±1% 17 - 20 3 6.49 – 12.95 357 ±1% 26 - 30 4 - 255 ±1% 36 - 44 Reserved for future use The CLASS pin must not be shorted to ground. DET: Connect a resistor, R(DET), between DET and VDD. This resistor should equal 24.9 kΩ, ±1% for most applications. R(DET) is connected across the input line when V(VDD) lies between 1.4 V and 11.3 V, and is disconnected when the line voltage exceeds this range to conserve power. This voltage range has been chosen to allow detection with two silicon rectifiers between the controller and the RJ-45 connector. VSS: This is the input supply negative rail that serves as a local ground to the TPS2375. 6 Submit Documentation Feedback Copyright © 2004–2008, Texas Instruments Incorporated Product Folder Link(s): TPS2375 TPS2376 TPS2377 |
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