HM169-06 Hendon Semiconductors, HM169-06 Datasheet - Page 6

• Manufacturer Part Number: HM169-06
• Description: Temperature Sensor Development Tools OM1682A demoboard
• Manufacturer: Hendon Semiconductors

Specifications of HM169-06

• Maximum Operating Temperature: + 45 C
• Minimum Operating Temperature: 0 C
• Operating Current: 7 mA
• Operating Voltage: 230 V
• For Use With/related Products: OM1682A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6
The HM169 electronic control module
provides a general purpose core
control module for triac control of a
variety of applications. It has
provision for a large number of
component options to be used
allowing a wide range of possible user
requirements to be covered through
the selection and placement of a few
components which are customised for
each specific application.
Some versions of the HM169 are
briefly described in this specification.
Each has its own more detailed
specification, including a parts list,
and each has a supporting
temperature calculation spreadsheet
and its power supply calculation
software. These and other
applications can be addressed by
following a documented design
process to select suitable component
values, and then, by adding these
components to the basic HM169-00
uncommitted module the required
module can be quite easily
manufactured. Less common
functions (for example use at another
mains voltage) can also be easily
accommodated by choice of the
components used.
The HM169-00 version consists of the
basic HM169 printed circuit board
already assembled with some of the
surface mount and other key common
parts, providing a basic module which
can be more easily customized to
whichever circuit a designer might
wish to assemble, than by starting
with the unpopulated bare board.
The versions of the HM169
designated by different suffix
numbers which have been mentioned
in this specification provide examples
of successful designs for typical
applications, as well as providing
examples the design process. The
data sheets for each of these variants
describe in more detail which added
2008 Jul 02, Revision 3.0
FUNCTIONAL OVERVIEW
or changed components are needed
with the standard HM169-00 circuit,
and highlight important application
information specific to these
applications.
In a normal application the core
HM169-00 unit (without the
customizing resistors) is made up into
a finished product by adding readily
available axial lead resistors. This has
been chosen as the preferred custom
assembly method, rather than having
a design based on surface mount
components which can be difficult for
an inexperienced person to use.
6.1
The HM169 contains a zero-crossing
triac driver OM1682A (IC1) for
electronically controlling a load, and
in its most common applications
thermostatically controls the load by
using an external NTC (Negative
Temperature Coefficient) thermistor
as the temperature sensor. The load
function may be either heating or
cooling (e.g. a hot water heating
element, room heater, fan or a
refrigeration compressor motor) and
this load may be resistive or inductive
in nature. The necessary changes to
suit each load, and to set the
switching temperatures or conditions
required, are made by selection and
placement of additional components
(mainly axial leaded resistors) on the
basic HM169-00 control module.
The HM169-00 module is already
assembled with an OM1682A IC, the
timing & supply capacitors and a
setting potentiometer. Before a
functioning module can be completed
several questions need to be
answered, resistor values calculated,
then these components together with
the chosen triac are soldered in place
to complete the module.
For a detailed description of the
functioning of the OM1682A
integrated circuit refer to the Data
Technical background
6
Precision electronic thermostat
Sheet “OM1682A Precision Triac
Control Thermostat”. There are also
application notes which describe in
detail the design considerations for
the power supply and also for the
input bridge configurations of circuits
using the OM1682A.
These are: AN001 ‘Power supply
circuits for OM1682A triac controller
IC applications’.
AN003: ‘Input sensing bridge design
for the OM1682A triac controller IC’.
To assist in the calculation of the input
bridge resistors, and to provide a
graphical picture of the temperature
control curve, the example control
circuits are each provided with an
Excel spreadsheet (HM169-xx.xls) in
which available practical resistor
values can be ‘tried’ and the resulting
changes in temperature trip points
observed.
Also the OM1682.exe software
program is available on two floppy
disks for installation on an IBM
compatible PC to make calculation of
the power supply components a
simple and straight forward task.
The component numbering in these
data sheets and the Excel
temperature calculation spreadsheet
use the same numbers for the
components; however the resistor
numbers used in the OM1682.exe
program and its printed output differ
as follows:
R8 in this data sheet = R5 in
OM1682.exe (Power to PWR)
R9 in this data sheet = R2 in
OM1682.exe (Power to LS).
R10 in this data sheet = R3 in
OM1682.exe (LS adjust to negative).
R13 in this data sheet = R1 in
OM1682.exe (gate series resistor).
R16 in this data sheet = R4 in
OM1682.exe (LS adjust to positive).
Engineering Sample Information
HM169