- 您現在的位置：買賣IC網 > PDF目錄371031 > MC34058FTA (MOTOROLA INC) 5-V Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 85 PDF資料下載
參數資料
| 型號： | MC34058FTA |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5-V Battery-Backup Supervisors for RAM Retention 8-MSOP -40 to 85 |
| 中文描述： | LINE TRANSCEIVER, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 237K |
| 代理商： | MC34058FTA |
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PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MC34065P-L | HIGH PERFORMANCE DUAL CHANNEL CURRENT MODE CONTROLLERS |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| MC34060 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:精密開關模式脈寬調制控制電路 |
發布緊急采購，3分鐘左右您將得到回復。