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參數(shù)資料
| 型號(hào)： | HPL1117-28U |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 1A Low Dropout Fast Response Positive Adjustable Regulator and Fixed 1.8V, 2.5V, 2.85V, 3.3V and 5V |
| 中文描述： | 1A低壓差快速反應(yīng)積極可調(diào)穩(wěn)壓器和固定在1.8V，2.5V，工作在2.85V，3.3V和5V |
| 文件頁(yè)數(shù)： | 11/19頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | HPL1117-28U |
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Rev. B.13 - Mar., 2004
HPL1117
11
Copyright
HIPAC Semiconductor, Inc.
www.hipacsemi.com
Output Capac itor (Cont.)
Application Information ( Cont.)
Aluminum electrolytics can also be used, as long as
the ESR of the capacitor is <1
. The value of the
output capacitor can be increased without limit. Higher
capacitance values help to improve transient response
and ripple rejection and reduce output noise.
The curves for Ripple Rejection were generated us-
ing an adjustable device with the adjust pin bypassed.
With a 22
μ
F bypassing capacitor 75dB ripple rejec-
tion is obtainable at any output level. The impedance
of the adjust pin capacitor, at the ripple frequency,
should be < R1. R1 is normally in the range of 100
-
200
. The size of the required adjust pin capacitor
is a function of the input ripple frequency. At 120Hz,
with R1=100
, the adjust pin capacitor should be
13
μ
F. For fixed voltage devices, and adjustable de-
vices without an adjust pin capacitor, the output ripple
will increase as the ratio of the output voltage to the
reference voltage (V
OUT
/V
REF
).
Ripple Rejec tion
T hermal Considerations
HPL1117 has thermal protection which limits junction
temperature to 150°C. However, device functionality
is only guaranteed to a maximum junction tempera-
ture of +125°C.
Both the TO-220, TO-252, TO-263 and SOT-223
packages use a copper plane on the PCB and the
PCB itself as a heatsink. To optimize the heat sinking
ability of the plane and PCB, solder the tab of the
package to the plane.
Figure 3&4 shows for the TO-252 and SOT-223 the
measured values of
θ
(J-A) for different copper area
sizes using a 2 layers, 1.6mm, and 6Sq. cm FR-4
PCB with 2oz. copper and a ground plane layer on
the backside area used for heatsinking. It can be
used as a rough guideline in estimating thermal
resistance.
25
30
35
40
45
50
0
2
4
6
8
10
12
14
T
(
TA=25°C
Top Copper Area (cm
2
)
Figure 3.
θ
(J-A) vs. copper area for the TO-252 package
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|---|---|
| HPL1117-28V | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1A Low Dropout Fast Response Positive Adjustable Regulator and Fixed 1.8V, 2.5V, 2.85V, 3.3V and 5V |
| HPL1117-33F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1A Low Dropout Fast Response Positive Adjustable Regulator and Fixed 1.8V, 2.5V, 2.85V, 3.3V and 5V |
| HPL1117-33G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1A Low Dropout Fast Response Positive Adjustable Regulator and Fixed 1.8V, 2.5V, 2.85V, 3.3V and 5V |
| HPL1117-33U | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1A Low Dropout Fast Response Positive Adjustable Regulator and Fixed 1.8V, 2.5V, 2.85V, 3.3V and 5V |
| HPL1117-33V | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1A Low Dropout Fast Response Positive Adjustable Regulator and Fixed 1.8V, 2.5V, 2.85V, 3.3V and 5V |
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