Electronic Components Datasheet Search
  English  ▼


ZXRD1033PQ16 Datasheet(PDF) 8 Page - Diodes Incorporated

Part # ZXRD1033PQ16
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

ZXRD1033PQ16 Datasheet(HTML) 8 Page - Diodes Incorporated

Back Button ZXRD1033PQ16 Datasheet HTML 4Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 5Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 6Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 7Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 8Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 9Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 10Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 11Page - Diodes Incorporated ZXRD1033PQ16 Datasheet HTML 12Page - Diodes Incorporated Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 28 page
background image
Applications (continued)
Inductor Selection
The inductor is one of the most critical components in
the DC-DC circuit.There are numerous types of devices
available from many suppliers. Zetex has opted to
specify off the shelf encapsulated surface mount
components, as these represent the best compromise
in terms of cost, size, performance and shielding.
The SimpleSync
TM technique uses a main inductor
with an overwinding for the gate drive which is
available as a standard part. However, for engineers
who wish to design their own custom magnetics, this
is a relatively simple and low cost construction
technique. It is simply formed by terminating one of
the multiple strands of litz type wire separately. It is
still wound on the same core as the main winding and
only has to handle enough current to charge the gate
of the synchronous MOSFET. The major benefit is
circuit simplification and hence lower cost of the control
IC. For non-synchronous operation, the overwinding is
not required.
The choice of core type also plays a key role. For
optimum performance, a ’swinging choke’ is often
preferred. This is one which exhibits an increase in
inductance as load current decreases. This has the net
effect of reducing circulating current at lighter load
improving efficiency. There is normally a cost
premium for this added benefit. For this reason the
chokes specified are the more usual constant
inductance type.
Peak current of the inductor should be rated to
minimum 1.2IOUT (max) . To maximise efficiency, the
winding resistance of the main inductor should be less
than the main switch output on resistance.
Schottky Diode
Selection depends on whether a synchronous or
non-synchronous approach is taken. For the
ZXRD1000, the unique approach to the synchronous
drive means minimal dead time and hence a small
SOT23 1A DC rated device will suffice, such as the
ZHCS1000 from Zetex. The device is only designed to
prevent the body diode of the synchronous MOSFET
from conducting during the initial switching transient
until the MOSFET takes over. The device should be
connected as close as possible to the source terminals
of the main MOSFET.
For non-synchronous applications , the Schottky diode
must be selected to allow for the worst case
conditions, when VIN is at its highest and VOUT is
lowest (short circuit conditions for example). Under
these conditions the device must handle peak current
at close to 100% duty cycle.
Frequency Adjustment
The nominal running frequency of the controller is set
to 200kHz in the applications shown.
This can be
adjusted over the range 50kHz to 300kHz by changing
the value of capacitor on the CT pin.
A low cost
ceramic capacitor can be used.
Frequency = 60000/C3 (pF)
Frequency v temperature is given in the typical
Output Voltage Adjustment
The ZXRD1000 is available as either a fixed 5V, 3.3V or
adjustable output. On fixed output versions, the VFB pin
should be connected to the output. Adjustable operation
requires a resistive divider connected as follows:
The value of the output voltage is determined by the
= VFB (1 +
Note: The adjustable circuit is shown in the following
transient optimisation section. It is also used in the
evaluation PCB. In both these circuits RA is assigned
the label R6 and RB the label R5.
Values of resistor should be between 1k and 20k to
guarantee operation. Output voltage can be adjusted in
the range 2V to 12V for non-synchronous applications.
For synchronous applications, the minimum VOUT is set
by the VGS threshold required for the synchronous
MOSFET, as t he sw ing in t he gat e using t he
TM technique is approximately VOUT.

Similar Part No. - ZXRD1033PQ16

ManufacturerPart #DatasheetDescription
Zetex Semiconductors
ZXRD1033PQ16 ZETEX-ZXRD1033PQ16 Datasheet
287Kb / 28P
More results

Similar Description - ZXRD1033PQ16

ManufacturerPart #DatasheetDescription
Zetex Semiconductors
ZXRD1000 ZETEX-ZXRD1000 Datasheet
287Kb / 28P
Maxim Integrated Produc...
MAX1652 MAXIM-MAX1652 Datasheet
265Kb / 28P
   High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP
19-1357; Rev 1; 7/98
Torex Semiconductor
XC9101 TOREX-XC9101_1 Datasheet
1Mb / 22P
   PWM Controlled Step-Up DC/DC Controllers
XC9201 TOREX-XC9201_1 Datasheet
1Mb / 24P
   PWM Controlled Step-Down DC/DC Controllers
XC9101 TOREX-XC9101 Datasheet
299Kb / 19P
   PWM Controlled Step-Up DC/DC Controllers
Richtek Technology Corp...
RT9201 RICHTEK-RT9201 Datasheet
194Kb / 13P
   High Efficiency PWM Step-Down DC-DC Converter
Torex Semiconductor
XC6368 TOREX-XC6368 Datasheet
431Kb / 28P
   PWM Controlled, PWM/PFM Switchable Step-Up DC/DC Controllers
XC6367 TOREX-XC6367_1 Datasheet
1Mb / 28P
   PWM Controlled, PWM/PFM Switchable Step-Up DC/DC Controllers
XC6367 TOREX-XC6367 Datasheet
1Mb / 27P
   PWM Controlled, PWM/PFM Switchable Step-Up DC/DC Controllers
XC6371 TOREX-XC6371 Datasheet
235Kb / 14P
   PWM Controlled Step-Up DC/DC Controllers/Converters
More results

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Go To PDF Page

Link URL

Privacy Policy
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