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参数资料
| 型号： | TPS2501DRCT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 1075 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, 0.90 MM HEIGHT, PLASTIC, SON-10 |
| 文件页数： | 10/41页 |
| 文件大小： | 1641K |
| 代理商： | TPS2501DRCT |
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I(AUX) Auxiliary Current mA
175
200
225
250
275
300
325
0
200
400
600
800
1000
I (
L
IM
IT
)
USB
Current
Limit
mA
G012
RL = 100 k
TJ = 25°C
VIN = 2.4 V
VIN = 3.3 V
VIN = 5.2 V
VIN = 4.75 V
VIN Input Voltage V
1250
1275
1300
1325
1350
1375
1400
1425
1450
3.25
3.75
4.25
4.75
5.25
I (
L
IM
IT
)
USB
Current
Limit
mA
G013
RL = 20 k
TJ = 25°C
I(AUX) = 200 mA
I(AUX) = 500 mA
I(AUX) = 0 mA
I(AUX) = 400 mA
I(AUX) = 300 mA
VIN Input Voltage V
625
650
675
700
725
750
2.25
2.75
3.25
3.75
4.25
4.75
5.25
I (
L
IM
IT
)
USB
Current
Limit
mA
G014
RL = 40 k
TJ = 25°C
I(AUX) = 500 mA
I(AUX) = 400 mA
I(AUX) = 300 mA
I(AUX) = 0 mA
I(AUX) = 200 mA
VIN Input Voltage V
175
200
225
250
275
300
325
2.25
2.75
3.25
3.75
4.25
4.75
5.25
I (
L
IM
IT
)
USB
Current
Limit
mA
G015
I(AUX) = 600 mA
I(AUX) = 500 mA
I(AUX) = 800 mA
I(AUX) = 1000 mA
I(AUX) = 0 mA
I(AUX) = 900 mA
I(AUX) = 700 mA
RL = 100 k
TJ = 25°C
I(AUX) = 200 mA
I(AUX) = 400 mA
I(AUX) = 300 mA
SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010
www.ti.com
Figure 16. USB Current-Limit Threshold vs IAUX,
Figure 17. USB Current-Limit Threshold vs VIN,
RILIM = 100 k, TA = 25 °C
RILIM = 20 k, TA = 25 °C
Figure 18. USB Current-Limit Threshold vs VIN,
Figure 19. USB Current-Limit Threshold vs VIN,
RILIM = 40 k, TA = 25 °C
RILIM = 100 k, TA = 25 °C
Accounting for Resistor Tolerance in the USB Switch Current-Limit Accuracy
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 TPS2500 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. Table 3 shows a process that accounts for
18
Copyright 2008–2010, Texas Instruments Incorporated
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