欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數(shù)資料
型號(hào): MC34058
廠商: Motorola, Inc.
英文描述: 5-V Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 85
中文描述: 六角環(huán)評(píng)- 485收發(fā)器與三態(tài)輸出
文件頁(yè)數(shù): 9/12頁(yè)
文件大小: 237K
代理商: MC34058
MC34058 MC34059
9
MOTOROLA ANALOG IC DEVICE DATA
θ
ja = j, j = 40, 60, .. 100
°
C/W.
Example 1. Balanced and Unbalanced Operation
IOL = 50 mA and IOH =
±
50 mA for each driver. VCC = 5.0 V.
How many drivers can be used (Typical power supply current ICCQ = 18 mA.)
Solution:
ICCQ = 0.018 A
The quiescent power is given by:
Balanced Operation:
To determine the amount of power dissipated by each
output stage we need to know the differential output voltage
for the output current required. Figure 7 shows that for IOH
and IOL differential of 50 mA, VODH and VODL are:
Unbalanced Operation:
To determine the amount of power dissipated by each
output stage we need to know the single–ended output
voltage for the output current required. Figures 5 and 6
shows that for an IOH and IOL of
±
50 mA,
VOH
(For this example, balanced operation is assumed.)
Summing the quiescent and driver power for 6 transceivers operating in a package produces;
PDTotal = PQ + 6
PDrvB, and equal to PDTotal = 0.69 W.
produces a set curves that can be used to determine a Safe Operating Area for the specific application. PDTotal is graphed with
PDmax to provide a reference.
PDmax ja, TA
TJmax–TA
ja
For the MC34058/9, the thermal resistance is capable of a wide range. The ability of the package to dissipate power depends
on board type and temperature, layout and ambient temperature (see Appendix A). For the purposes of this example the
thermal resistance can range from 40
°
C/W to 100
°
C/W;
Varying the ambient operating temperature TA = 25, 30, .. 85
°
C; specifying a maximum junction temperature to avoid
thermal shutdown TJmax = 130
°
C; and using the first order approximation for maximum power dissipation;
VOD
|3.0|, and IOL
|IOH|
IOut
0.050 A.
And the power dissipated by each driver is given by;
PDrvB
PDrvB
IOut·
0.10 W.
VCC– VOD
and equal to
3.9 V
VOL
0.895 V
And the power dissipated by each driver is calcu-
lated by;
PDrvU
and equal to
VCC– VOH
· |IOH|
VOL· IOL
PDrvU
0.10 W.
20
3.0
W
TA (
°
C)
30
40
60
80
90
2.5
1.5
0.5
0
1.0
2.0
* Safe Operating Area (SOA), is an operating power, PDTotal, less than PDmax.
So all the drivers in the package can be used if the thermal resistance and/or the ambient temperature is low enough.
Graph of Maximum Power Dissipation Possible
for a Particular
θ
ja and Ambient Temperature
70
50
PDTotal
PDmax (
θ
ja40
PQ
ICCQ· VCC, and is equal to PQ
0.09 W.
*SOA
PDmax (
θ
ja60
PDmax (
θ
j80
PDmax (
θ
ja100
相關(guān)PDF資料
PDF描述
MC34058FTA 5-V Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 85
MC34059 5-V Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 85
MC34059FTA HEX EIA-485 TRANSCEIVER with THREE-STATE OUTPUTS
MC3405P Processor Supervisory Circuits with Power-Fail 8-SOIC -40 to 85
MC3405P Processor Supervisory Circuits with Power-Fail 8-SOIC -40 to 85
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC34058FTA 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HEX EIA-485 TRANSCEIVER with THREE-STATE OUTPUTS
MC34059 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HEX EIA-485 TRANSCEIVER with THREE-STATE OUTPUTS
MC34059FTA 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HEX EIA-485 TRANSCEIVER with THREE-STATE OUTPUTS
MC3405P 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:DUAL OPERATIONAL AMPLIFIER / DUAL VOLTAGE COMPARATOR
MC3406 制造商:SHENZHENFREESCALE 制造商全稱:ShenZhen FreesCale Electronics. Co., Ltd 功能描述:N-Channel 30-V (D-S) MOSFET High performance trench technology
主站蜘蛛池模板: 彭阳县| 金湖县| 台北市| 长汀县| 中西区| 莆田市| 邢台县| 阳春市| 安国市| 娄底市| 娱乐| 扶余县| 翁牛特旗| 宝坻区| 洞口县| 晋中市| 册亨县| 达拉特旗| 顺平县| 揭西县| 祁阳县| 偏关县| 贵南县| 南溪县| 绥德县| 息烽县| 乌兰察布市| 佛教| 邯郸市| 黔江区| 鹤庆县| 陇川县| 桐庐县| 博湖县| 海口市| 甘孜县| 济阳县| 永丰县| 台湾省| 江门市| 东丽区|