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參數(shù)資料
| 型號： | TPS2551DRVR |
| 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 |
| 文件大小： | 1402K |
| 代理商： | TPS2551DRVR |
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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
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
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
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