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參數(shù)資料
| 型號： | TPS2561DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | GREEN, SON-10 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大小： | 942K |
| 代理商： | TPS2561DRCT |
1.056
ILIM
OSmin
61200V
OSmin
R
k
1
1.056
ILIM
OSmin
ILIM
I
(mA) = 2000mA
I
(mA) =
61200V
R
(k ) =
I
mA
R
(k ) = 25.52k
W
÷
÷
÷
÷
è
ILIM
OSmax
0.957
ILIM
OSmax
0.957
OSmax
R
(k ) = 25.5k
52850V
I
(mA) =
R
k
52850V
I
(mA) =
25.5
k
I
(mA) = 2382mA
W
0.957
ILIM
OSmax
52850V
OSmax
R
k
1
0.957
ILIM
OSmax
ILIM
I
(mA) = 1000mA
I
(mA) =
52850V
R
(k ) =
I
mA
R
(k ) = 63.16k
W
÷
÷
÷
÷
è
63.4
ILIM
OSmin
1.056
ILIM
OSmin
1.056
OSmin
R
(k ) = 63.4k
61200V
I
(mA) =
R
k
61200V
I
(mA) =
k
I
(mA) = 765mA
W
www.ti.com
SLVS930 – DECEMBER 2009
APPLICATION 1: DESIGNING ABOVE A MINIMUM CURRENT LIMIT
Some applications require that current limiting cannot occur below a certain threshold. For this example, assume
that 2 A must be delivered to the load so that the minimum desired current-limit threshold is 2000 mA. Use the
(2)
Select the closest 1% resistor less than the calculated value: RILIM = 25.5 k. This sets the minimum current-limit
threshold at 2 A . Use the IOS equations, Figure 18, and the previously calculated value for RILIM to calculate the
maximum resulting current-limit threshold.
(3)
The resulting maximum current-limit threshold is 2382 mA with a 25.5 k
resistor.
APPLICATION 2: DESIGNING BELOW A MAXIMUM CURRENT LIMIT
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 1000 mA to protect an up-stream power supply. Use
(4)
Select the closest 1% resistor greater than the calculated value: RILIM = 63.4 k. This sets the maximum
current-limit threshold at 1000 mA . Use the IOS equations, Figure 18, and the previously calculated value for
RILIM to calculate the minimum resulting current-limit threshold.
(5)
The resulting minimum current-limit threshold is 765 mA with a 63.4 k
resistor.
Copyright 2009, Texas Instruments Incorporated
13
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