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参数资料
| 型号： | TPS2552DRVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | GREEN, PLASTIC, SON-6 |
| 文件页数： | 7/32页 |
| 文件大小： | 1025K |
| 代理商： | TPS2552DRVT |
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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
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
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
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
SLVS841D
– NOVEMBER 2008 – REVISED JUNE 2011
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 1 A must be delivered to the load so that the minimum desired current-limit threshold is 1000 mA. Use the
(2)
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.
(3)
The resulting maximum current-limit threshold is 1172.4 mA with a 23.7 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 500 mA to protect an up-stream power supply. Use
(4)
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.
(5)
The resulting minimum current-limit threshold is 400.6 mA with a 59 k
resistor.
Copyright
2008–2011, Texas Instruments Incorporated
15
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