參數(shù)資料
型號: TPS2363PFBG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
封裝: PLASTIC, TQFP-48
文件頁數(shù): 10/44頁
文件大小: 840K
代理商: TPS2363PFBG4
R
SENSE +
Threshold Voltage
I
SENSE
+
0.045
3.5 A +
0.0128 W
I
MAX +
Threshold Voltage
R
SENSE
+
0.055 V
12.87 mW +
4.27 A
SLUS680B – JANUARY 2006 – REVISED JANUARY 2010
www.ti.com
Fault Threshold calculations
An over-current fault is determined by the voltage developed across a sense resistor. A small resistance,
typically less than tens of milliohms is placed in the slot current switch path. The voltage across the sense
resistor is input to a comparator that turns on when the voltage is greater than the current limit threshold.
The 3.3 V has a PCIExpress specification of 3.0 A for any connector width.
With tolerances on the resistor and etch we limit the current to 3.5 A.
The minimum current limit threshold for 3.3 V is 45 mV.
(use a 13-m
resistor)
Check the maximum current limit,
A 1% resistor is 12.87 m
minimum.
The Maximum current limit threshold is 55 mV.
Table 4. 3.3-V Sense Resistor Values
RESISTOR (m
)
AVG CURRENT (A)
MAX CURRENT (A)
+3.3 V
13
3.5
4.27
The 12-V sense resistor values table shows the recommended RSENSE values for the 12 V for the 1, 8, and 16
wide connectors.
Table 5. 12-V Sense Resistor Values
CONNECTOR WIDTH
RESISTOR (m
)
AVG CURRENT (A)
MAX CURRENT (A)
1
50
0.9
1.11
4,8
20
2.1
2.78
16
10
4.4
5.56
16 graphics
8
5.5
6.94
18
Copyright 2006–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2363
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