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參數(shù)資料
| 型號(hào)： | LT1112CJ8 |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 196K |
| 代理商： | LT1112CJ8 |
7
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
Thermal Considerations
LT1117 series regulators have internal thermal limiting
circuitry designed to protect the device during overload
conditions. For continuous normal load conditions how-
ever, the maximum junction temperature rating of 125
°
C
must not be exceeded.
It is important to give careful consideration to all sources
of thermal resistance from junction to ambient. For the
SOT-223 package, which is designed to be surface
mounted, additional heat sources mounted near the de-
vice must also be considered. Heat sinking is accom-
plished using the heat spreading capability of the PC board
and its copper traces. The thermal resistance of the
LT1117 is 15
°
C/W from the junction to the tab. Thermal
resistances from tab to ambient can be as low as 30
°
C/W.
The total thermal resistance from junction to ambient can
be as low as 45
°
C/W. This requires a reasonable sized PC
board with at least one layer of copper to spread the heat
across the board and couple it into the surrounding air.
Experiments have shown that the heat spreading copper
layer does not need to be electrically connected to the tab
of the device. The PC material can be very effective at
transmitting heat between the pad area, attached to the tab
of the device, and a ground plane layer either inside or on
the opposite side of the board. Although the actual thermal
resistance of the PC material is high, the Length/Area ratio
of the thermal resistor between layers is small. The data in
Table 1 was taken using 1/16" FR-4 board with 1oz. copper
foil. It can be used as a rough guideline in estimating
thermal resistance.
Table 1.
COPPER AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
45
°
C/W
45
°
C/W
53
°
C/W
59
°
C/W
52
°
C/W
55
°
C/W
TOPSIDE*
2500 Sq. mm
1000 Sq. mm
225 Sq. mm
100 Sq. mm
1000 Sq. mm
1000 Sq. mm
* Tab of device attached to topside copper
BACKSIDE
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
1000 Sq. mm
0
BOARD AREA
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
2500 Sq. mm
1000 Sq. mm
1000 Sq. mm
The thermal resistance for each application will be affected
by thermal interactions with other components on the
board. Some experimentation will be necessary to deter-
mine the actual value.
The power dissipation of the LT1117 is equal to:
P
D
= ( V
IN
– V
OUT
)( I
OUT
)
Maximum junction temperature will be equal to:
T
J
= T
A(MAX)
+ P
D
(Thermal Resistance (junction-to-
ambient))
Maximum junction temperature must not exceed 125
°
C.
Ripple Rejection
The curves for Ripple Rejection were generated using an
adjustable device with the adjust pin bypassed. These
curves will hold true for all values of output voltage. For
proper bypassing, and ripple rejection approaching the
values shown, the impedance of the adjust pin capacitor,
at the ripple frequency, should be < R1. R1 is normally in
the range of 100
to 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. At 10kHz only 0.16
μ
F is needed.
For fixed voltage devices, and adjustable devices 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
). For example, with the output voltage equal to
5V, the output ripple will be increased by the ratio of
5V/1.25V. It will increase by a factor of four. Ripple
rejection will be degraded by 12dB from the value shown
on the curve.
APPLICATIOU
U
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參數(shù)描述 |
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| LT1112CN8 | 功能描述:IC PREC OP-AMP LOWPWR DUAL 8-DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| LT1112CN8#PBF | 功能描述:IC PREC OP-AMP LOWPWR DUAL 8-DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1112CN8PBF | 制造商:Linear Technology 功能描述:LT1112CN8PBF |
| LT1112CS8 | 制造商:Linear Technology 功能描述: |
| LT1112IN8 | 功能描述:IC OP AMP PREC LO PWR DUAL 8-DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:3 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:70µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:Digi-Reel® 其它名稱:MAX4475AUT#TG16DKR |
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