參數(shù)資料
型號： TPS2551DRVTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6
封裝： GREEN, PLASTIC, SON-6
文件頁數(shù)： 10/32頁
文件大?。?/td> 1402K
代理商： TPS2551DRVTG4
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R
-k
ILIM
W
Current-LimitThreshold-mA
IOC(max)
IOC(typ)
IOC(min)
IOS(min)
APPLICATION 1: DESIGNING ABOVE A MINIMUM CURRENT-LIMIT
APPLICATION 2: DESIGNING BELOW A MAXIMUM CURRENT-LIMIT
SLVS736B – FEBRUARY 2008 – REVISED NOVEMBER 2008 ........................................................................................................................................ www.ti.com
Figure 21. Current-Limit Threshold Vs.RILIM
Some applications require that current-limiting cannot occur below a certain threshold. For this example, assume
that 1 A must be delivered to the load so that the minimum desired current-limit threshold is 1000 mA. Use the
IOS equations and Figure 21 to select RILIM.
I
OS(min) (mA) = 1000 mA
I
OS(min) (mA) = (39700 V) / ILIM (k))
1.342
R
ILIM (k) = [(39700 V) / (IOS(min) (mA))]
1/1.342
R
ILIM = 15.54 k
Select the closest 1% resistor less than the calculated value: RILIM = 15.4 k. This sets the minimum current-limit
threshold at 1 A . Use the IOC equations, Figure 21, and the previously calculated value for RILIM to calculate the
maximum resulting current-limit threshold.
R
ILIM = 15.4 k
I
OC(max) (mA) = (24500 V) / ILIM (k))
0.975
I
OC(max) (mA) = (24500 V) / (15 (k))
0.975
I
OC(max) = 1703 mA
The resulting maximum current-limit threshold is 1.7 A with a 15.4 k
resistor.
Some applications require that current-limiting must occur below a certain threshold. For this example, assume
that the desired upper current-limit threshold must be below 1.25 A to protect an up-stream power supply. Use
the IOC equations and Figure 21 to select RILIM.
I
OC(max) (mA) = 1250 mA
I
OC(max) (mA) = (24500 V) / ILIM (k))
0.975
R
ILIM (k) = [(24500 V) / (IOC(max) (mA))]
1/0.975
R
ILIM = 21.15 k
18
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS2550 TPS2551
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