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參數資料
| 型號： | TPS2561DRC |
| 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： | 6/24頁 |
| 文件大?。?/td> | 942K |
| 代理商： | TPS2561DRC |
SLVS930 – DECEMBER 2009
www.ti.com
ACCOUNTING FOR RESISTOR TOLERANCE
The previous sections described the selection of RILIM given certain application requirements and the importance
of understanding the current-limit threshold tolerance. The analysis focused only on the TPS2560/61
performance and assumed an exact resistor value. However, resistors sold in quantity are not exact and are
bounded by an upper and lower tolerance centered around a nominal resistance. The additional RILIM resistance
tolerance directly affects the current-limit threshold accuracy at a system level. The following table shows a
process that accounts for worst-case resistor tolerance assuming 1% resistor values. Step one follows the
selection process outlined in the application examples above. Step two determines the upper and lower
resistance bounds of the selected resistor. Step three uses the upper and lower resistor bounds in the IOS
equations to calculate the threshold limits. It is important to use tighter tolerance resistors, e.g. 0.5% or 0.1%,
when precision current limiting is desired.
Table 1. Common RILIM Resistor Selections
Resistor Tolerance
Actual Limits
Ideal
Closest 1%
Desired Nominal
Resistor
IOS MIN
IOS Nom
IOS MAX
Current Limit (mA)
1% low (k
)
1% high (k
)
(k
)
(k
)
(mA)
300
186.7
187
185.1
188.9
241.6
299.5
357.3
400
140.0
140
138.6
141.4
328.0
400.0
471.4
600
93.3
93.1
92.2
94.0
504.6
601.5
696.5
800
70.0
69.8
69.1
70.5
684.0
802.3
917.6
1000
56.0
56.2
55.6
56.8
859.9
996.4
1129.1
1200
46.7
46.4
45.9
46.9
1052.8
1206.9
1356.3
1400
40.0
40.2
39.8
40.6
1225.0
1393.0
1555.9
1600
35.0
34.8
34.5
35.1
1426.5
1609.2
1786.2
1800
31.1
30.9
30.6
31.2
1617.3
1812.3
2001.4
2000
28.0
28
27.7
28.3
1794.7
2000.0
2199.3
2200
25.5
25.2
25.8
1981.0
2196.1
2405.3
2400
23.3
23.2
23.0
23.4
2188.9
2413.8
2633.0
2600
21.5
21.3
21.7
2372.1
2604.7
2831.9
2800
20.0
20
19.8
20.2
2560.4
2800.0
3034.8
14
Copyright 2009, Texas Instruments Incorporated
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