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TPS2371 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS2371 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 14 page TPS2371 SLUS566A − JULY 2003 − REVISED NOVEMBER 2003 5 www.ti.com DETAILED PIN DESCRIPTIONS (continued) EN_DC (Pin 6) Enable pin for the load. This pin is intended to be used with a dc-to-dc coverter with a soft start capacitor. When power is not available to the dc-to-dc converter, this pin sinks 80- µA and hold off the softstart cap on the dc-to-dc converter. Once the voltage across the load is within 1.5 V of its final value, the EN_DC pin stops drawing current and become high impedance, allowing the dc-to-dc to soft start normally. DELAY (Pin 7) This pin controls the amount of time that the device ignores an undervoltage condition on VDD. That time is set by the following equation: T DELAY + 100 ms mF C DELAY VDD (Pin 8) Positive supply to the device. Table 1. PoE Classification Resistance Values CLASS RESISTANCE (RCLASS) VALUE (Ω) POWERED DEVICES (PDs) Power (W) CLASSIFICATION CURRENT (mA) 0 4420 0.44 − 12.95 2.5 1 953 0.44 − 3.84 10.8 2 549 3.84 − 6.49 18.6 3 357 6.49 − 12.95 28.4 4 255 reserved for future use 39.6 (2) |
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