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| 型号： | BZ05FB682ZSB |
| 厂商： | AVX Corporation |
| 文件页数： | 23/26页 |
| 文件大小： | 0K |
| 描述： | CAP SUPER 6.8MF 15V BZ05 SMD |
| 标准包装： | 100 |
| 系列： | BestCap® BZ |
| 电容： | 6.8mF |
| 电压 - 额定： | 15V |
| 容差： | -20%，+80% |
| ESR（等效串联电阻）： | 500 毫欧 |
| 寿命@温度： | 70°C 时为 1000 小时 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | BZ05，3 引线 |
| 包装： | 散装 |
| 尺寸/尺寸： | 0.787" L x 0.591" W（20.00mm x 15.00mm） |
| 高度 - 座高（最大）： | 0.228"（5.80mm） |
| 工作温度： | -20°C ~ 70°C |
| 其它名称： | 478-6277 |
BestCap Ultra-low ESR
?
High Power Pulse Supercapacitors
4.4 BESTCAP FOR GSM/GPRS PCMCIA
THE SOLUTION:
MODEMS
There is an increasing usage of PCMCIA modem cards for
wireless LAN and WAN (Wide Area Network) applications.
SOLUTION A
Chip Tantalum
SOLUTION B
BestCap ?
BZ154B473ZSB
The PCMCIA card is used as an accessory to Laptops and
PDA’s, and enables wide area mobile Internet access,
including all associated applications like Email and file
transfer.
With the wide spread use of GSM networks, a PCMCIA
GSM modem is a commonly used solution. To achieve
higher speed data rates, GSM networks are now being
upgraded to support the GPRS standard.
The design challenge:
GSM/GPRS transmission requires a current of approximate-
ly 2A for the pulse duration. The PCMCIA bus cannot supply
this amount of pulsed current. Therefore, there is a need for
a relatively large capacitance to bridge the gap.
Rated Capacitance
(milli Farad)
Capacitance
@ 0.5msec Pulse
(milli Farad)
Operating Voltage (V)
ESR
(milli ohm)
Size (mm)
Voltage Drop* (V)
GPRS Pulse
(25% duty cycle)
Voltage After Pulse (V)
Cutoff Voltage (V)
Pass / FAIL
2.2
2.2
3.7
50
.4 x 7 x 2
0.804V
2.896
3.1
FAIL
47
30
3.7
160
20 x 15 x 2.1
0.268V
3.432
3.1
PASS
The capacitor supplies the pulse current to the transmitter,
and is charged by a low current during the interval between
* V=V 1 +V 2 =1.5A*ESR + (1.5A*1.154msec)/C
pulses.
V
V + from
PCMCIA bus
Capacitor
Transmitter
}
V 1 = I*ESR
Current
Voltage
2 Ampere
}
V 2 = I* t/C
t
It is assumed that during the pulse, 0.5A is delivered by the
battery, and 1.5A by the capacitor.
Conclusion: High capacitance is needed to minimize voltage
drop. A high value capacitance, even with a higher ESR,
results in a lower voltage drop. Low voltage drop minimizes
the conductive and emitted electro magnetic interference,
and increases transmitter output power and efficiency.
22
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