參數(shù)資料
型號： TPS2552DBV-1
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： PLASTIC, SOT-23, 6 PIN
文件頁數(shù)： 7/32頁
文件大?。?/td> 2005K
代理商： TPS2552DBV-1
APPLICATION 1: DESIGNING ABOVE A MINIMUM CURRENT LIMIT
1.016
ILIM
OSmin
25230V
OSmin
R
k
1
1.016
ILIM
OSmin
ILIM
I
(mA) = 1000mA
I
(mA) =
25230V
R
(k ) =
I
mA
R
(k ) = 24k
W
÷
÷
÷
÷
è
(2)
ILIM
OSmax
0.94
ILIM
OSmax
0.94
OSmax
R
(k ) = 23.7k
22980V
I
(mA) =
R
k
22980V
I
(mA) =
23.7
k
I
(mA) = 1172.4mA
W
(3)
APPLICATION 2: DESIGNING BELOW A MAXIMUM CURRENT LIMIT
0.94
ILIM
OSmax
22980V
OSmax
R
k
1
0.94
ILIM
OSmax
ILIM
I
(mA) = 500mA
I
(mA) =
22980V
R
(k ) =
I
mA
R
(k ) = 58.7k
W
÷
÷
÷
÷
è
(4)
ILIM
OSmin
1.016
ILIM
OSmin
1.016
OSmin
R
(k ) = 59k
25230V
I
(mA) =
R
k
25230V
I
(mA) =
59
k
I
(mA) = 400.6mA
W
(5)
www.ti.com...................................................................................................................................... SLVS841C – NOVEMBER 2008 – REVISED SEPTEMBER 2009
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 24 to select RILIM.
Select the closest 1% resistor less than the calculated value: RILIM = 23.7 k. This sets the minimum current-limit
threshold at 1 A . Use the IOS equations, Figure 24, and the previously calculated value for RILIM to calculate the
maximum resulting current-limit threshold.
The resulting maximum current-limit threshold is 1172.4 mA with a 23.7 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 500 mA to protect an up-stream power supply. Use
the IOS equations and Figure 24 to select RILIM.
Select the closest 1% resistor greater than the calculated value: RILIM = 59 k. This sets the maximum
current-limit threshold at 500 mA . Use the IOS equations, Figure 24, and the previously calculated value for RILIM
to calculate the minimum resulting current-limit threshold.
The resulting minimum current-limit threshold is 400.6 mA with a 59 k
resistor.
Copyright 2008–2009, Texas Instruments Incorporated
15
Product Folder Link(s): TPS2552 TPS2553 TPS2552-1 TPS2553-1
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