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OM1895AT

Description
Board mounted temperature sensor 50ma triac simmerstat
CategoryThe sensor   
File Size628KB,16 Pages
ManufacturerHendon Semiconductors
Environmental Compliance
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OM1895AT Overview

Board mounted temperature sensor 50ma triac simmerstat

OM1895
Simmerstat control IC
1
FEATURES
range of applications, extending from the zero-crossing
control of a heating element, a fan motor and other
complex loads.
Because the operation of the OM1895 uses characteristics
of triacs which are common to typical triacs, but may show
some variation in triacs designed to emphasise specific
uncommon features, it is preferable to use triacs which
have been characterized and specified as suitable for use
in this application.
The triac firing circuit uses a unique circuit arrangement by
which load current zero crossing is detected, and a
widened gate pulse applied during the critical current zero
crossing period. Triac conduction is therefore maintained
throughout the zero crossing time, ensuring that rfi
transients are not generated during this time. With
inductive loads only the final half cycle that ends an ON
period (made up of an odd number of mains half cycles),
will finish with a voltage transient. This may still need a
snubber network to limit dv/dt, although it will not be
required for the consecutive conducting half cycles during
the ON time.
rfi elimination triac drive circuit
Low external component count
Low supply current required
Variable ON and OFF cycle times
External ON/OFF triac control available
No DC component in the AC mains supply
The ON period always has an odd number of half cycles,
and the OFF period an even number
Gate pulse width may be externally set
Negative triac gate drive (avoids insensitive quadrant
operation)
Versions available with slower cycle times to meet EMC
flicker regulations
2
GENERAL DESCRIPTION
The OM1895 is a precision low power simmerstat control
IC for triggering a triac in applications where variable ON
and OFF cycle time is required. It is suitable for a broad
3
BLOCK DIAGRAM
R2
220kΩ
LOAD
Triac
BT208X
-600E
22nF
250
Vac
AC
220V
Common
MODE
V
CC
PWR Reset
OM1895
RV1
470kΩ
Pot
3
7
1
Power
Supply
8
Gate
Sensing
6
TRG
R3
300Ω
2
Ramp
Generator
Mode
logic
Zero-crossing
Timing and
Synchronisation
Gate
Drive
C2
100uF
16V
4
V
EE
5
PX
R1
470kΩ
C1
100pF
block1895
Fig.1 Block diagram
© 2006 Integrated Electronic Solutions Pty Ltd. trading as
Hendon Semiconductors, all rights reserved.
Contents are subject to the Disclaimer
2007 Apr 19, Revision 2.0
1
Product Specification

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