Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

CLM7660 Datasheet(PDF) 3 Page - Calogic, LLC

Part # CLM7660
Description  DC-to-DC Voltage Converter
Download  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  CALOGIC [Calogic, LLC]
Direct Link  http://www.calogic.net
Logo CALOGIC - Calogic, LLC

CLM7660 Datasheet(HTML) 3 Page - Calogic, LLC

  CLM7660 Datasheet HTML 1Page - Calogic, LLC CLM7660 Datasheet HTML 2Page - Calogic, LLC CLM7660 Datasheet HTML 3Page - Calogic, LLC CLM7660 Datasheet HTML 4Page - Calogic, LLC CLM7660 Datasheet HTML 5Page - Calogic, LLC CLM7660 Datasheet HTML 6Page - Calogic, LLC CLM7660 Datasheet HTML 7Page - Calogic, LLC CLM7660 Datasheet HTML 8Page - Calogic, LLC  
Zoom Inzoom in Zoom Outzoom out
 3 / 8 page
background image
CLM7660
CORPORATION
CIRCUIT DESCRIPTION
The CLM7660 is an excellent voltage doubler, the device has
all the characteristic with the exception of two inexpensive
10
µF polarized electrolytic external capacitors. Figure 3
demonstrates the most effective means of using the device as
a voltage doubler. Capacitor C1 is charged to a voltage, V+,
for the half cycle when switches S1 and S3 are closed. (Note
Switches S2 and S4 are open during this half cycle.) During
the second half of the operation, switches S2 and S4 are
closed, with S1 and S3 open, thereby shifting capacitor C1
negatively by V+ volts. Charge is then transferred from C1 to
C2, such that voltage on C2 is exactly V+, asumming ideal
switches and no load on C2.
The four switches in Figure 3 are MOS power switches, S1 is
a P-Channel device, S2, S3 and S4 are N-Channel devices.
The major challenge with this approach while integrating the
switches, the substrates of S3 and S4 must always remain
reversed-biased with respect to their sources, but not so
much as to degrade their ON-resistances.
In addition, at
circuit start-up, and under short circuit conditions (VOUT=V
+),
the output voltage must be sensed and the substrate bias
adjusted accordingly. Failure to accomplish this will result in
high power losses and probable device latch-up.
The above problem is eliminated in the CLM7660 by a logic
network which senses the output voltage (VOUT) together with
the level translators, and switches the substrates of S3 and S4
to the correct level to maintain necessary reverse bias.
The voltage regulator portion of the CLM7660 is an integral
part of the anti-latch-up circuitry. Its inherent voltage drop can
degrade operation at low voltages. To improve low-voltage
operation, the LV pin should be connected to GND, disabling
the regulator. For supply voltages greater than 3.5V, the LV
terminal must be left open to ensure latch-up proof operation
and prevent device damage.
THEORETICAL POWER EFFICIENCY CONSIDERATIONS
In theory, a voltage multiplier can approach 100% efficiency if
certain conditions are met:
1. The drive circuitry consumes minimal power.
2. The output switches have extremely low ON-resistance and
virtually no offset.
3. The impedances of the pump and reservoir capacitors are
negligible at the pump frequency.
When larger values of C1 and C2 are used, the CLM7660
approaches the above conditions for negative voltage
multiplication. Energy is lost only if the transfer of the charge
between capacitors if a change in voltage occurs. The energy
lost is defined by:
E=1/2C1 (V12-V22)
During the pump and transfer cycles V1 and V2 are the
voltages on C1. If the impedances of C1 and C2 are high at
the pump frequency (see Figure 3), compared to the value of
RL, there will be a substantial difference in voltages V1 and
V2. The most optimum selection would be to make C2 as
large as possible to eliminate output voltage ripple, and to
utilize a large value for C1 to achieve maximum efficiency of
operation.
OPERATIONAL RULES:
Never exceed maximum supply voltages.
Never connect LV terminal to GND for supply voltages over
3.5V.
Never short circuit the output to V
+ supply voltages above
5.5V for extended periods; however, transient conditions
including start-up are acceptable.
For polarized capacitors, the + terminal of C1 must be
connected to pin 2 of the CLM7660 and the + terminal to of C2
must be connected to GND.
For high-voltage, elevated temperature applications add a
diode DX (reference Figure 1).
The 1N914 diode is an
appropriate choice.
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025


Similar Part No. - CLM7660

ManufacturerPart #DatasheetDescription
logo
List of Unclassifed Man...
CLM7000 ETC1-CLM7000 Datasheet
83Kb / 2P
   LED-Photoconductor Isolators
CLM7100 ETC1-CLM7100 Datasheet
83Kb / 2P
   LED-Photoconductor Isolators
CLM7200 ETC1-CLM7200 Datasheet
83Kb / 2P
   LED-Photoconductor Isolators
More results

Similar Description - CLM7660

ManufacturerPart #DatasheetDescription
logo
Powerex Power Semicondu...
M57182N-315 POWEREX-M57182N-315 Datasheet
56Kb / 4P
   High Voltage Input DC-to-DC Converter
logo
Microchip Technology
TC7660 MICROCHIP-TC7660 Datasheet
91Kb / 12P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
2001
logo
ON Semiconductor
MC7660 ONSEMI-MC7660 Datasheet
191Kb / 12P
   Charge Pump DC-to-DC Voltage Converter
February, 2000 ??Rev. 2
logo
Microchip Technology
TC1044S MICROCHIP-TC1044S Datasheet
92Kb / 11P
   Charge Pump DC-TO-DC Voltage Converter
2001
logo
TelCom Semiconductor, I...
TC1044S TELCOM-TC1044S Datasheet
141Kb / 8P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
TC7662B TELCOM-TC7662B Datasheet
133Kb / 9P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
logo
Microchip Technology
TC7660 MICROCHIP-TC7660_02 Datasheet
386Kb / 18P
   Charge Pump DC-to-DC Voltage Converter
2002
TC7660 MICROCHIP-TC7660_16 Datasheet
1Mb / 20P
   Charge Pump DC-to-DC Voltage Converter
11/29/11
logo
TelCom Semiconductor, I...
TC7660 TELCOM-TC7660 Datasheet
131Kb / 9P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
logo
Microchip Technology
TC7662B MICROCHIP-TC7662B Datasheet
92Kb / 11P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
2001
More results


Html Pages

1 2 3 4 5 6 7 8


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com