/ Auxiliary power supply for peak power 1.

Murata EDLC Application Note
No. C2M1CXS-081
Auxiliary power supply for peak power
/Contribute to downsizing power supply or adding high functions
Peak Power
＋
Peak Power
DMF Series
Average
Power
ESR: Power source >>
Peak
Power
Average Power
Average Power
Time
DC Power source
/Battery
(1) Normal design of power supply
(Decide capacity of power supply according to peak power)
電源
Power
Power source
Rated Power
Load
＋
Charge
DMF Series
Time
DC Power source
/Battery
Peak Power
Average Power
Time
DC Power source
/Battery
(2) Add new function to application (Power shortage occurs)
1.
Description
4.
Brock diagram
Electrical Double Layer Capacitors (EDLCs, super capacitors) are
energy storage devices which have longer life time than batteries and
higher capacitance than ceramic capacitors or electrolytic capacitors.
Murata’s EDLC DMF series, featuring low ESR of 50mΩ, can offer
high-power charging and discharging of 50W.
Murata’s EDLC can assist peak power for applications which
require momentary peak power. It enables to downsize various power
supplies. In addition, when using EDLC with battery or power supply
which has limited power, it can add high function to application or
improve application quality.
2.
Explanation
【DC-DC converter reference】
TPS62750（Texas Instruments） Step-Down converter
Vin: 2.9V～6.0V, Vout: 0.8V～5.1V
(1)Downsize power supply
Capacity of power supply is normally decided according to peak
power. However, when using EDLC, power supply can be downsized
because EDLC can assist peak power.
LTC3128（Linear Technology）Buck-Boost converter
Vin: 1.73V～5.5V, Vout: 1.8V～5.5V
【LED Flash Driver reference】
TPS6130*(Texas Instruments), AS3630(ams)
(2)Add high functions
When adding high function to application, re-design of powers
supply is normally needed in order to supply additional power.
However, high function can be added without changing power supply
by using EDLC which can assist such additional power.
3.
5.
Applications
Product Lineup
P/N
Rated
Voltage
Capacitance
ESR
(1 kHz)
Dimensions
Operating
Temperature
DMF3Z5R5H474M3DTA0
Peak 5.5V
Constant 4.2V
470 mF
45 mΩ
14 x 21 x 3.2 mm
-40 to +70°C
DMF4B5R5G105M3DTA0
Peak 5.5V
Constant 4.2V
1,000mF 40 mΩ
14 x 30 x 3.7 mm
-40 to +70°C

Optical Applications: Enable high power flash
(e.g. LED Flash, LED beacon, IR sensor, laser)
 Mechanical Applications: Momentary operation for high peak at
mechanical applications
(e.g. motor, pump, door look, solenoid valve, valve for smart meters)
 RF Applications: Used as power supply for high power wireless
communication such as GSM
(e.g. handy terminal. RKE, smart water meters, etc)
 USB Devices: Enables to increase peak power of USB power
(e.g. external HDD, USB accessory, etc.)
14
4
4
6.
Negative
Terminal
30
3.7mm
3.2mm
DMF3Z5R5H474M3DTA0
Positive
Terminal
14
21
Load
Peak Power
EDLC
Solution using Murata’s EDLC (DMF series)
Average
Power
EDLC
＋
Average
Power
Power source
Rated Power
Peak
Power
Power
shortage
電源
Power
Power
source
Rated
Power
Power
Load
DMF4B5R5G105M3DTA0
Balance Terminal
Technical support
Sample: Please contact Murata sales or Distributor
Design support
-Please access our website for more information.
(http://www.Murata.com/en-eu/products/capacitor/edlc)
- C2M1CXS-053 Murata EDLC Technical note
- C2M1CXS-067 Murata EDLC Reliability Data Book (DMF series)
If you have any question, please contact your local Murata sales
Copyright © Murata Manufacturing Co., Ltd. All rights reserved.
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