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参数资料
| 型号： | TPS2377DRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 21/24页 |
| 文件大小： | 579K |
| 代理商： | TPS2377DRG4 |
Detailed Pin Description
I
(LIM) +
25000
R
(ILIM)
(1)
data sheet
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
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
O
powered device (PD). The IEEE classification levels and corresponding
resistor values are shown in Table 1.
Connect a 24.9-k
detection resistor from DET to VDD for a valid PD
DET
3
O
detection.
VSS
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
O
TPS2375 load.
PG
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
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 k to 500 k. A value of 178 k 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) ()
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 k, ±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
Copyright 2004–2008, Texas Instruments Incorporated
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