HM226-L Hendon Semiconductors, HM226-L Datasheet - Page 3

• Manufacturer Part Number: HM226-L
• Description: Switch Modules & Development Tools IES5541A demoboard Logic Input Control
• Manufacturer: Hendon Semiconductors

Specifications of HM226-L

• Description/function: Relay Switch Demo Board
• Board Size: 70 mm x 61 mm
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Supply Current: 10 A
• For Use With/related Products: IES5541A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1
• Protects relay contacts from damage due to arcing of
• Relay control does not suffer from the heat dissipation
• Uses a small inexpensive triac to momentarily protect
• Relay switching can be either temperature sensor
• Designed to drive resistive and inductive loads up to
• Uses common NTC thermistor temperature sensors
• Significantly reduces Electro-Magnetic Interference
• Greatly extends the lifetime of the relay contacts in
• Allows fast relay switching for improved temperature
• Provides a complete sensing and control solution for
3
Note
1. The operating voltage range can be set to any desired AC range by selection of power supply resistors. Application
2007 Dec 11, Revision 5.0
VSUP
ILOAD
Tstg
Tamb
mains voltage in high load applications
limitations of similar triac control solutions
the relay from arcing during switching
triggered or digitally controlled
2.3kW
(EMI) by zero crossing load switching
constant switching applications
control, without causing early relay failure
resistive and inductive loads
circuits are easily designed for 100−120 V, or even an extended voltage range such as 100 to 250 V.
SYMBOL
FEATURES
QUICK REFERENCE DATA
AC supply voltage
load current
storage temperature range
operating ambient temperature
range
PARAMETER
(note 1)
in free air
CONDITIONS
3
Protected Relay Switching Module
2
The HM226 as supplied is an electromechanical
thermostat for heating loads up to 10 amps. It can also be
configured as a logic controlled switch. It uses a relay and
triac to control the load. It is designed to operate from
230Vac mains power, and can be designed to operate
from 110/120Vac. It uses the IES5541A Relay Driver with
Contact Protection integrated circuit to control the relay
and triac.
An electronically switched relay is ideal in situations where
heat dissipation from a triac is an issue. However, relays
are usually only rated for around 100,000 electrical
switching cycles, failing due to contact degradation. Until
now this has prevented their use in thermostats, which
require regular switching to maintain the desired
temperature. The HM226 uses a triac to conduct the initial
and final load current of each relay switching cycle,
minimizing relay contact arcing.
Using the IES5541A and a triac, the relay life can be
extended to over 10 times the relay’s rated electrical
switching cycles. This enables relay control in constant
switching high load applications such as home heating,
cooking appliances and fabric care products.
GENERAL DESCRIPTION
207
0
−
−25
MIN
Engineering Sample Information
HM226 - L / T
230
−
−
−
TYP
253
10
+85
+70
MAX
V
A
°C
°C
UNIT