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2376

更新时间： 2024-01-18 15:24:58

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
23页	671K
描述
IEEE 802.3af PoE POWERED DEVICE CONTROLLERS WITH AUTO-RETRY

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2376 技术参数

生命周期：	Contact Manufacturer	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8504.32.00.00
风险等级：	5.63	次级绕组数量：	1
输出电流 1：	21.74 A	变压器类型：	TOROIDAL POWER TRANSFORMER
VA 额定值：	5000 VA	Base Number Matches：	1

2376 数据手册

TPS2375-1

TPS2377-1

www.ti.com

SLVS570–MARCH 2005

DEVICE INFORMATION (continued)

TPS2375-1/77-1

(TOP VIEW)

VDD

ILIM

CLASS

DET

N/C

RTN

VSS

TERMINAL FUNCTIONS

PIN NAME

ILIM

PIN NUMBER

I/O

DESCRIPTION

Connect a resistor from ILIM to VSS to set the start-up inrush current limit. 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 powered device

(PD). The IEEE classification levels and corresponding resistor values are shown in

Table 1.

CLASS

DET

VSS

Connect a 24.9-kΩ detection resistor from DET to VDD for a valid PD detection.

Return line on the source side of the TPS2375-1 from the PSE.

Switched output side return line used as the low-side reference for the TPS2375-1

load.

RTN

Open-drain, power-good output; active high.

No connection

VDD

Positive line from the rectified PSE provided input.

Detailed Pin Description

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:

25000

(LIM)

(ILIM)

(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 power sourcing equipment (PSE).

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)

0.44 – 12.95

0.44 – 3.84

3.84 – 6.49

6.49 – 12.95

R_(CLASS)(Ω)

4420 ±1%

953 ±1%

549 ±1%

357 ±1%

255 ±1%

802.3af LIMITS (mA)

0 - 4

NOTE

Default class

9 - 12

17 - 20

26 - 30

36 - 44

Reserved for future use

1...3 4 567 8 9...23

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