- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄377704 > LT1497CS8 (LINEAR TECHNOLOGY CORP) Dual 125mA, 50MHz Current Feedback Amplifier PDF資料下載
參數(shù)資料
| 型號(hào)： | LT1497CS8 |
| 廠(chǎng)商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Dual 125mA, 50MHz Current Feedback Amplifier |
| 中文描述： | DUAL OP-AMP, 15000 uV OFFSET-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 302K |
| 代理商： | LT1497CS8 |
9
LT1497
or power plane layer either inside or on the opposite side
of the board. Copper board stiffeners and plated through-
holes can also be used to spread the heat generated by the
device. Table 1 lists the thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 board with 2oz copper.
This data can be used as a rough guideline in estimating
thermal resistance. The thermal resistance for each appli-
cation will be affected by thermal interactions with other
components as well as board size and shape.
Table 1. Fused 16-lead and 8-lead SO Packages
COPPER AREA (2oz)
TOTAL
θ
JA
θ
JA
TOPSIDE
2500mm
2
1000mm
2
600mm
2
180mm
2
180mm
2
180mm
2
180mm
2
180mm
2
180mm
2
BACKSIDE
2500mm
2
2500mm
2
2500mm
2
2500mm
2
1000mm
2
600mm
2
300mm
2
100mm
2
0mm
2
COPPER AREA
5000mm
2
3500mm
2
3100mm
2
2680mm
2
1180mm
2
780mm
2
480mm
2
280mm
2
180mm
2
(16-LEAD)
40
°
C/W
46
°
C/W
48
°
C/W
49
°
C/W
56
°
C/W
58
°
C/W
59
°
C/W
60
°
C/W
61
°
C/W
(8-LEAD)
80
°
C/W
92
°
C/W
96
°
C/W
98
°
C/W
112
°
C/W
116
°
C/W
118
°
C/W
120
°
C/W
122
°
C/W
Calculating Junction Temperature
The junction temperature can be calculated from the
equation:
T
J
= (P
D
)(
θ
JA
) + T
A
T
J
= Junction Temperature
T
A
= Ambient Temperature
P
D
= Power Dissipation
θ
JA
= Thermal Resistance (Junction-to-Ambient)
As an example, calculate the junction temperature for the
circuit in Figure 1 assuming an 85
°
C ambient temperature.
The device dissipation can be found by measuring the
supply currents, calculating the total dissipation and then
subtracting the dissipation in the load and feedback net-
work. Both amplifiers are in a gain of –1.
The dissipation for each amplifier is:
P
D
= (1/2)(86.4mA)(30V) – (10V)
2
/(200||560) = 0.62W
The total dissipation is 1.24W. When a 2500mm
2
PC
board with 2oz copper on top and bottom is used, the
thermal resistance is 40
°
C/W. The junction temperature
T
J
is:
T
J
= (1.24W)(40
°
C/W) + 85
°
C = 135
°
C
The maximum junction temperature for the LT1497 is
150
°
C, so the heat sinking capability of the board is
adequate for the application.
If the copper area on the PC board is reduced to 180mm
2
the thermal resistance increases to 61
°
C/W and the junc-
tion temperature becomes:
T
J
= (1.24W)(61
°
C/W) + 85
°
C = 161
°
C
which is above the maximum junction temperature indi-
cating that the heat sinking capability of the board is
inadequate and should be increased.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
560
–15V
560
–
+
560
560
86.4mA
15V
200
200
1497 F01
–
+
A
–10V
10V
f = 2MHz
Figure 1. Thermal Calculation Example
Slew Rate
Unlike a traditional op amp, the slew rate of a current
feedback amplifier is not independent of the amplifier gain
configuration. There are slew rate limitations in both the
input stage and the output stage. In the inverting mode and
for higher gains in the noninverting mode, the signal
amplitude on the input pins is small and the overall slew
rate is that of the output stage. The input stage slew rate
is related to the quiescent current in the input devices.
Referring to the Simplified Schematic, for noninverting
applications the two current sources in the input stage
slew the parasitic internal capacitances at the bases of Q3
and Q4. Consider a positive going input at the base of Q1
and Q2. If the input slew rate exceeds the internal slew rate,
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1498CS8 | 10MHz, 6V/us, Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps |
| LT1499 | 10MHz, 6V/us, Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps |
| LT1499CS | 10MHz, 6V/us, Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps |
| LT1498CN8 | 10MHz, 6V/us, Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps |
| LT1501IS8 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1497CS8#PBF | 功能描述:IC CURRNT FEEDBCK AMP DUAL 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類(lèi)型:通用 電路數(shù):1 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
| LT1497CS8#TR | 功能描述:IC OPAMP CFA DUAL 50MHZ 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:J-FET 電路數(shù):2 輸出類(lèi)型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1497CS8#TRPBF | 功能描述:IC CURRNT FEEDBCK AMP DUAL 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:J-FET 電路數(shù):2 輸出類(lèi)型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1498 | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Single/Dual/Quad 60MHz, 20V/us, Low Power, Rail-to-Rail Input and Output Precision Op Amps |
| LT1498_09 | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Driving A-to-D Converters |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。