Product category:
Capacitors
News Release from: Cooper Electronic Technologies | Subject: PowerStor Series F
Edited by the Electronicstalk Editorial
Team on 09 July 2003
Supercapacitors slim for PC Card
applications
The world's first commercially available ultra-thin flat supercapacitors use innovative aluminium foil-polymer laminate packaging to achieve a market leading thickness of less than 1mm.
The world's first commercially available ultra-thin flat supercapacitors use innovative aluminium foil-polymer laminate packaging instead of the conventional thicker metal can material to achieve a market leading thickness of less than 1mm Combined with the option of high energy density or ultra-low ESR to meet specific requirements, the new design is ideal for a host of space-critical applications such as PCMCIA cards, hand-held devices and hybrid battery-supercapacitor packs
This article was originally published on Electronicstalk on 19 Jun 2003 at 8.00am (UK)
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The PowerStor Series F low-ESR capacitors were developed initially for GSM/GPRS applications, including wireless PCMCIA modems.
Ultra-thin devices are particularly important for Type II PCMCIA cards which are only 5mm thick, with a two sided 1mm thick circuit board and a supercapacitor height restriction as low as 2mm or less.
Devices in PCMCIA specification allow less than 1A of current to flow from the notebook battery to the PC card and for GSM/GPRS transmissions, up to 2A.
GSM mode involves transmission for approximately 0.6ms every 4.6ms and lower currents in receive and standby modes in the remaining 4ms.
The supercapacitor is charged by excess battery current for 4ms between the 0.6ms discharges.
Under GPRS protocol, transmission rates are double to quadruple the transmit times of GSM.
Although low ESR is the primary design criterion to minimise the voltage drop from the supplied voltage to the power amplifier, Series F supercapacitors provide significantly more capacitance than other capacitor technologies to satisfy GPRS's extended pulse length.
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