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參數資料
| 型號： | TPS2557DRB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | PLASTIC, SON-8 |
| 文件頁數： | 3/22頁 |
| 文件大小： | 942K |
| 代理商： | TPS2557DRB |
0.947
ILIM
1.0028
ILIM
1.0708
ILIM
99038V
OSmax
R
k
111704V
OSnom
R
k
127981V
OSmin
R
k
I
(mA) =
I
(mA) =
I
(mA) =
W
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
20
30
40
50
60
70
80
90
100
110
120
130
140
150
R
– CurrentLimitResistor – k
ILIM
Current-LimitThreshold
–
mA
IOS(min)
IOS(typ)
IOS(max)
1.0708
ILIM
OSmin
127981V
OSmin
R
k
1
1.0708
ILIM
OSmin
ILIM
I
(mA) = 3000mA
I
(mA) =
127981V
R
(k ) =
I
mA
R
(k ) = 33.3k
W
÷
÷
÷
÷
è
www.ti.com
SLVS931 – NOVEMBER 2009
PROGRAMMING THE CURRENT-LIMIT THRESHOLD
The overcurrent threshold is user programmable via an external resistor. The TPS2556/57 uses an internal
regulation loop to provide a regulated voltage on the ILIM pin. The current-limit threshold is proportional to the
current sourced out of ILIM. The recommended 1% resistor range for RILIM is 20 k ≤ RILIM ≤ 187 k to ensure
stability of the internal regulation loop. Many applications require that the minimum current limit is above a certain
current level or that the maximum current limit is below a certain current level, so it is important to consider the
tolerance of the overcurrent threshold when selecting a value for RILIM. The following equations approximate the
resulting overcurrent threshold for a given external resistor value ILIM). Consult the Electrical Characteristics
table for specific current limit settings. The traces routing the RILIM resistor to the TPS2556/57 should be as short
as possible to reduce parasitic effects on the current-limit accuracy.
(1)
Figure 19. Current-Limit Threshold vs. RILIM
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 3 A must be delivered to the load so that the minimum desired current-limit threshold is 3000 mA. Use the
(2)
Select the closest 1% resistor less than the calculated value: RILIM = 33.2 k. This sets the minimum current-limit
threshold at 3000 mA . Use the IOS equations, Figure 19, and the previously calculated value for RILIM to
calculate the maximum resulting current-limit threshold.
Copyright 2009, Texas Instruments Incorporated
11
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