參數(shù)資料
型號(hào): LT1969CMS
廠商: Linear Technology
文件頁數(shù): 3/20頁
文件大?。?/td> 0K
描述: IC OP-AMP ADJ CURRNT DUAL 10MSOP
標(biāo)準(zhǔn)包裝: 50
放大器類型: 通用
電路數(shù): 2
轉(zhuǎn)換速率: 200 V/µs
增益帶寬積: 700MHz
電流 - 輸入偏壓: 1.5µA
電壓 - 輸入偏移: 1000µV
電流 - 電源: 7mA
電流 - 輸出 / 通道: 700mA
電壓 - 電源,單路/雙路(±): 4 V ~ 13 V,±2 V ~ 6.5 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 管件
11
LT1969
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 10-Lead MSOP Package
COPPER AREA
TOPSIDE*
BACKSIDE
BOARD AREA
THERMAL RESISTANCE
(mm2)(mm2)(mm2)
(JUNCTION-TO-AMBIENT)
540
2500
110
°C/W
100
2500
120
°C/W
100
0
2500
130
°C/W
30
0
2500
135
°C/W
0
2500
140
°C/W
*Device is mounted on topside.
Calculating Junction Temperature
The junction temperature can be calculated from the
equation:
TJ = (PD)(θJA) + TA
TJ = Junction Temperature
TA = Ambient Temperature
PD = Device Dissipation
θJA = Thermal Resistance (Junction-to-Ambient)
As an example, calculate the junction temperature for the
circuit in Figure 1 assuming an 70
°Cambienttemperature.
The device dissipation can be found by measuring the
supply currents, calculating the total dissipation and then
subtracting the dissipation in the load.
The dissipation for the amplifiers is:
PD = (63.5mA)(12V) – (4V/√2)2/(50) = 0.6W
The total package power dissipation is 0.6W. When a 2500
sq. mm PC board with 540 sq. mm of 2oz copper on top
and bottom is used, the thermal resistance is 110
°C/W.
The junction temperature TJ is:
TJ = (0.6W)(110°C/W) + 70°C = 136°C
The maximum junction temperature for the LT1969 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 0 sq. mm
the thermal resistance increases to 140
°C/W and the
junction temperature becomes:
TJ = (0.6W)(140°C/W) + 70°C = 154°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
WU
UU
Figure 1. Thermal Calculation Example
+
6V
–6V
909
100
100
+
1969 F01
1K
50
–4V
4V
f = 1MHz
13k
6
49.9k
CTRL1
CTRL2
7
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