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OM1654A
Simple zero-crossing triac control
1
2
FEATURES
• Low external component count
GENERAL DESCRIPTION
The OM1654A is a monolithic bipolar control circuit for
zero-crossing triggering of a triac in applications where it is
controlled by a resistive sensor such as an NTC (negative
temperature coefficient) thermistor. In a typical application
it can be used for the temperature control of a heating
element in a cooker or another home heating or personal
care appliance.
• Constant ON cycle time, with proportional OFF time
• All ON cycles consist of an integral number of mains
cycles
• No DC component in the mains supply
• On chip circuit protection against triac gate spikes
• Low supply current requirement
Separate power supply (PWR) and mains zero-crossing
sensing (AC) inputs allow for optimal setting of gate pulse
width.
• Sensor AC powered, thus minimising DC supply and
filtering needs
Using a single resistor supply connected to AC, the
OM1654A is designed to control a suitable triac over an
ambient of 0 to 100 degrees Celsius with a resistive load
ranging from 400 watts on a nominal 220/250 volt mains
supply.
• OM1654A has separate power supply input, allowing
easy gate pulse width adjustment
When using a separate supply resistor connector to the
power supply pin (PWR), very small loads down to around
30W can be controlled.
The OM1654A can also be easily applied to 120Vac or
other mains voltage applications.
3
BLOCK DIAGRAM
Neutral
GATE
2
Triac
BT134-600E
Vcc
3
Rb
NTC
100k
@25°C
zero
crossing
8 AC
θ
330k
Rc 0.25W
7 PWR
latch
SENS 4
Rd* 100k
0.6W
control
logic
Load
stabalised
DC supply
6.5V
230Vac
mains
1µA
C2
47uF
10V
45µA
12mA
RV1
100k
OM1654A
Ra
6
1
CAP
Vee
C1
100nF
−6.5V
Active
* If required
OM1654A-block
Fig.1 Block diagram
© 2006 Integrated Electronic Solutions Pty Ltd. trading as
Hendon Semiconductors, all rights reserved.
2007 Feb 13, Revision 2.0
Contents are subject to the Disclaimer
1
Product Specification
OM1654A
Simple zero-crossing triac control
4
4.1
PINNING INFORMATION
Pinning layout (8 pin)
4.2
Pin description (8 pin)
SYMBOL
VEE
VEE
1
8
AC
GATE
2
7
PWR
VCC
3
6
CAP
SENS
4
5
n.c.
OM1654A
PIN
DESCRIPTION
1
Negative supply (SUBS)
GATE
2
Triac gate drive
VCC
3
Positive supply (common, COM)
SENS
4
Temperature sense
n.c.
5
not connected
CAP
6
Timing capacitor
PWR
7
Power supply input
AC
8
Mains supply synchronisation
pin1654A-8
Fig.2 Pinning diagram (DIL-8 and SO-8)
5
5.1
FUNCTIONAL DESCRIPTION
VCC − Positive DC supply
(Common)
The positive DC supply rail for the
control IC OM1654A is used as the
Common reference. This is
connected to the T1 terminal of the
triac, and being the positive supply
rail enables negative gate drive to the
triac in both positive and negative
supply half cycles on T2. By driving
the triac in this way the insensitive
quadrant (negative T2 voltage, and
positive gate triggering signal) is
avoided.
5.2
VEE − Negative DC supply
The VEE connection is the negative
DC power supply terminal of the
OM1654A. This should be bypassed
to VCC by a filtering capacitor of 47
microfarads. The operating voltage is
typically −6.5 volts. This capacitor
2007 Feb 13, Revision 2.0
needs to be sufficiently large to
maintain the operating voltage during
the half cycle when it is not being
charged, as well as to provide the
energy to drive the triac gate during
the gate pulse.
5.3
AC − AC signal, power
supply and synchronisation
For the OM1654A the AC input is
connected to the active mains supply
rail via a resistor chosen to give the
required gate pulse width, to ensure
that during zero crossing of the mains
cycle the gate signal is applied from
before the load current falls below the
triac holding current, until after the
load current has increased to a value
greater than the triac latching current.
A resistor from PWR to VEE may be
required to ensure the gate drive
pulse is still present when the
negative mains voltage is insufficient
2
for the load current to have reached
the negative latching current.
In the simplest application (optimised
for a 400W load), the AC input is
connected via a 220 kΩ resistor to the
220/250 volt AC mains supply line.
The AC input signal is rectified to
provide some of the internal supply
voltage, and also provides the
synchronising information required by
the OM1654A to generate the zero
crossing signal.
5.4
PWR − Power supply
The pin (PWR) allows a lower value
resistor to be used to provide an
adequate DC power supply while also
permitting easy adjustment of the
gate pulse width with a high
impedance network on the AC pin.
The PWR pin is driven by a resistor
from the mains Active. This resistor is
chosen to ensure that the DC power
Product Specification
OM1654A
Simple zero-crossing triac control
supply is sufficient to provide the
power supply necessary for the
function of the OM1654A, and in
addition to provide the energy needed
for the gate drive. These calculations
are described in the OM1654A
application note AN002.
5.5
GATE − Triac gate drive
The triac gate drive output is
designed to be connected directly to
the gate. It has inbuilt protection to
withstand transient signals which may
be induced on the gate of the triac by
mains transients during firing. The
gate drive is designed for a triac with
a gate sensitivity which requires less
than 10 mA of triggering current, and
a suitable latching current. One triac
with suitable characteristics is the
BTA208 series E when used with a
load of more than 400 watts.
5.6
CAP − Timing capacitor
The timing capacitor is connected
between this pin and VEE (−ve). The
discharge time of this capacitor sets
the triac ON time, and is proportional
to the capacitance value
(approximately 4 seconds per
microfarad). The charging period, or
OFF time, varies with the magnitude
of the input signal from the sensor.
The ON period is synchronised with
the mains zero crossing signals so
that an integral number of full cycles
makes up the ON period, and no nett
DC signal is generated in the supply
line.
The initiation of an ON period is
suppressed until the chip power
supply reaches its regulated value.
After reaching a valid VEE the chip will
stay in operation even if the supply
falls to about 4 volts. It won’t start until
the “zener” first conducts.
5.7
SENS − Sensor input
The sensor input is designed to
accept an input which is an AC signal
referenced to common; thereby
avoiding problems associated with
the power dissipation involved in
generating sufficient DC current to
drive the sensor over its full operating
resistance range. If a suitable
resistive sensor is used with a parallel
level setting potentiometer to apply a
proportion of the AC sensor signal to
the SENS input, a typical circuit will
power this via a 220 kΩ resistor from
the AC supply. The SENS input signal
threshold is one VBE below the VCC
rail. Signals with a magnitude greater
than this VBE charge the timing
capacitor towards the VCC rail until it
reaches the threshold which initiates
an ON cycle. Signals with a
magnitude less than this do not
charge the capacitor, and the triac
drive remains OFF.
External circuits may be used to give
greater temperature linearity and
accuracy, and improved performance
with variation in ambient temperature.
The SENS input is only active on
negative signals with respect to VCC,
and therefore either a full AC input
may be used, or a signal that is only
negatively going with respect to VCC.
Fig.3 Control duty-cycle vs ac input voltage (Vsense)
2007 Feb 13, Revision 2.0
3
Product Specification
OM1654A
Simple zero-crossing triac control
6 LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134) Voltages with respect to VCC pin 3.
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
Vsupply
Supply voltage range (VEE)
V1−3
−7.6
+0.5
V
VAC
Voltage range (AC)
V8−3
−7.6
+0.5
V
VPWR
Voltage range (AC)
V8−3
−7.6
+0.5
V
VCAP
Voltage range (CAP)
V6−3
V1−0.8
+0.8
V
VSENS
Voltage range (SENS)
V4−3
−1.6
+0.8
V
VGATE
Voltage range (GATE)
V2−3
V1−30
+50
V
I
DC current (any pin)
−
20
mA
Ptot
total power dissipation
−
300
mW
Tstg
storage temperature
−40
+150
°C
Tamb
operating ambient temperature
0
+100
°C
2007 Feb 13, Revision 2.0
4
Product Specification
OM1654A
Simple zero-crossing triac control
7 CHARACTERISTICS
At Tamb = 25°C; Voltages are specified with respect to VCC, pin 3
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Power supply
−VEE
supply voltage (operating)
−IEE
supply current (operating)
gate current (triac T1 to VCC)
5.9
6.5
7.6
V
excluding gate drive
−
80
150
µA
VGATE = VCC
10
12.5
−
mA
Gate drive
IGATE
Zero crossing detection
IAC
+ve threshold
−
45
−
µA
−VAC
−ve threshold
−
6.4
−
V
Timing capacitor
−ICAP
discharge current
−
1
2.2
µA
−VUT
upper threshold
−
1100
−
mV
−VLT
lower threshold
−
VEE+1100
ICAP
charge current
−
150
ISENS = −20 µA
mV
−
µA
Sense input
−VSENS
sense voltage
ISENS = −20 µA
−
1000
−
mV
−VSENS
sense voltage
duty cycle = 50%
−
575
−
mV
−∆VSENS/ oC
temperature sensitivity
−
2.2
−
mV/oC
(see figure 3 for further information on control duty cycle vs input ac sense voltage)
VSENS(rms)
AC sense voltage
Duty cycle = 5%
−
0.47
−
V(rms)
VSENS(rms)
AC sense voltage
Duty cycle = 25%
−
0.48
−
V(rms)
VSENS(rms)
AC sense voltage
Duty cycle = 50%
−
0.50
−
V(rms)
VSENS(rms)
AC sense voltage
Duty cycle = 75%
−
0.53
−
V(rms)
VSENS(rms)
AC sense voltage
Duty cycle = 95%
−
0.65
−
V(rms)
VSENS(rms)
AC sense voltage
Duty cycle = 100%
−
0.73
−
V(rms)
8
8.1
APPLICATION INFORMATION
Design considerations
Figure 4 shows a typical simple circuit
for a load of greater than 400W. In this
application the PWR pin is not used.
The power supply resistance of
220 kΩ for R3 sets the DC power
supply current available for the
2007 Feb 13, Revision 2.0
operation of the circuit. When it is
required to fire the triac the gate pulse
width must be sufficiently long to
ensure that the triac load current is
greater than the latching current when
the gate pulse is removed. Hence the
need to specify a minimum operating
load for this circuit. At the same time
most of the operating DC current
derived through the resistor is used in
5
providing the gate signal, thereby
putting a tight limit on the upper value
of the width of the gate pulse. The
width of the gate pulse is derived from
the supply voltage and the
instantaneous value of the current
flowing through the power supply
resistor.
Product Specification
OM1654A
Simple zero-crossing triac control
In figure 5 an application circuit is
shown for a 60W load, using the PWR
pin as well as the AC input pin.
Using a BTA204W-600E triac for a
60W load on 220V means an 805Ω
load. At 20mA latching current
(positive), then the mains voltage for
latching is 16V (with a margin use
20V) at a phase angle of 3.7 degrees.
For 45µA in R3 when the mains
voltage is 20V, then
R4 = 420kΩ
The supply current at mains peak
voltage in R3 is
( 220 × 2 ) ⁄ ( 420k ) = 740µA .
The negative latching current of the
BTA204W is –15mA, giving a mains
voltage at this time of –15V. Thus
when the mains voltage is –15V, from
the ratio of R3 and R5, the voltage on
pin AC must be –6V. Therefore
R5 = 270kΩ, and the firing angle 2.8
degrees.
The gate pulse width is 6.5 degrees,
with a duty cycle of 3.6%. That is
722µA average for a peak (cold plus
margin) gate current of – 20mA.
Therefore the average current
needed from the power supply is the
average gate current, plus the
maximum supply current, plus the
average positive threshold current:
.
45
722 + 150 + ------ = 895µA
2
Of this 740 ⁄ π = 235 µA is supplied
via R3, so R5 must supply a further
660 µA average through the PWR pin.
Therefore R5 is 100 kΩ:
220 ⁄ ( 660 × π ) = 106kΩ
A number of important characteristics
of the triac are temperature sensitive.
It is essential that the controlling
integrated circuit exhibits comparable
sensitivity to temperature change so
that its characteristics vary in the
same way as those of the triac,
ensuring proper triggering over the
full operating range.
2007 Feb 13, Revision 2.0
NEGATIVE HALF CYCLE
A typical triac has a maximum
latching current for the negative half
cycle of 25 mA. If the gate pulse is
terminated when the supply voltage
falls below −6 volts, the minimum load
can be calculated for which the
holding current is reached before the
supply voltage falls to this value.
However, with the addition of
resistors to VEE and VCC from the AC
pin, other threshold voltages can be
achieved, allowing other loads.
POSITIVE HALF
CYCLE
A typical positive half cycle latching
current is 35 mA. Considering chip
resistor tolerances, and from the
value of the mains power supply
resistor of 220 kΩ in figure 4 the end
of the gate pulse can be calculated
using the threshold current of
nominally 45 µA where the gate drive
is turned off.
GATE CURRENT
In assuming a triac gate current of
10 mA minimum an on chip margin
has to be allowed for component
tolerances, and a suitable variation
with ambient temperature. Also it
needs to be realised that most of the
supply current is used in providing the
gate current.
negative temperature coefficient
(NTC) thermistor or another resistive
sensing element can be used. Note
that at the low temperature end of the
potentiometer travel no sensing
signal is available at all. However
simple resistor networks are usually
needed to linearise the response of
the setting resistor against control
temperature, and can easily be
designed to allow for maximum and
minimum operating points.
Alternatively these might be set
mechanically by stops inherent in the
mechanical construction of the
product using the OM1654A.
Some applications require more
accurate control over a limited
temperature range. Use of an input
bridge circuit with gain will permit
greater accuracy, and exhibit less
ambient temperature dependence
(for example by using one external
transistor). These circuits still use an
AC sensing circuit, and therefore do
not provide any additional loading on
the DC power supply (see application
note AN004)
Thus in characterising the OM1654
the design has taken into account the
availability of suitably sensitive triacs,
and used this to employ design
figures enabling operation in specific
applications with minimum external
component count, and yet ensuring
reliable triggering and proper
operation over normal operating
temperature and supply voltage
conditions.
TEMPERATURE SENSING
The application circuit in figure 4 is
the simplest configuration in which a
6
Product Specification
OM1654A
Simple zero-crossing triac control
9
APPLICATION CIRCUITS
ACTIVE
R3
220
kΩ
R1
220
kΩ
AC
PWR
7
NTC1
10
kΩ
RV1
10 kΩ
SENS
TR1
BTA208X
-600E
8
OM1654A
IC1
4
θ
6
230 V
AC
MAINS
GATE
2
3
1
VEE
CAP
R2
1 kΩ
LOAD
VCC
NEUTRAL
C1
470nF
25V
C2
47µF
10V
1654A-cct 1
Fig.4 OM1654 application diagram: 400 W resistive heating load, referenced to mains
ACTIVE
R4
100kΩ
0.6W
VR37
R1
220
kΩ
R3
420
kΩ
PWR
7
NTC1
10
kΩ
RV1
10 kΩ
SENS
θ
AC
8
OM1654A
IC1
4
6
2
TR1
BTA204W
-600E
GATE
230 V
AC
MAINS
3
1
CAP
LOAD
>60W
VCC
VEE
R2
1 kΩ
R5
270
kΩ
NEUTRAL
C1
470nF
25V
C2
47µF
10V
1654A-cct 2
Fig.5 OM1654A application diagram: 60W resistive heating load
2007 Feb 13, Revision 2.0
7
Product Specification
OM1654A
Simple zero-crossing triac control
10 PACKAGE OUTLINES
DIP8: plastic dual in-line package; 8 leads (300 mil)
SOT97-1
ME
seating plane
D
A2
A
A1
L
c
Z
w M
b1
e
(e 1)
b
5
8
MH
b2
pin 1 index
E
1
4
0
5
10 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
min.
A2
max.
b
b1
b2
c
D (1)
E (1)
e
e1
L
ME
MH
w
Z (1)
max.
mm
4.2
0.51
3.2
1.73
1.14
0.53
0.38
1.07
0.89
0.36
0.23
9.8
9.2
6.48
6.20
2.54
7.62
3.60
3.05
8.25
7.80
10.0
8.3
0.254
1.15
inches
0.17
0.020
0.13
0.068
0.045
0.021
0.015
0.042
0.035
0.014
0.009
0.39
0.36
0.26
0.24
0.10
0.30
0.14
0.12
0.32
0.31
0.39
0.33
0.01
0.045
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT97-1
050G01
MO-001AN
2007 Feb 13, Revision 2.0
EIAJ
EUROPEAN
PROJECTION
ISSUE DATE
92-11-17
95-02-04
8
Product Specification
OM1654A
Simple zero-crossing triac control
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
D
E
A
X
c
y
HE
v M A
Z
5
8
Q
A2
A
(A 3)
A1
pin 1 index
θ
Lp
L
4
1
e
detail X
w M
bp
0
2.5
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (2)
e
HE
L
Lp
Q
v
w
y
Z (1)
mm
1.75
0.25
0.10
1.45
1.25
0.25
0.49
0.36
0.25
0.19
5.0
4.8
4.0
3.8
1.27
6.2
5.8
1.05
1.0
0.4
0.7
0.6
0.25
0.25
0.1
0.7
0.3
inches
0.069
0.010 0.057
0.004 0.049
0.01
0.019 0.0100
0.014 0.0075
0.20
0.19
0.16
0.15
0.050
0.01
0.01
0.004
0.028
0.012
0.244
0.039 0.028
0.041
0.228
0.016 0.024
θ
o
8
0o
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT96-1
076E03S
MS-012AA
2007 Feb 13, Revision 2.0
EIAJ
EUROPEAN
PROJECTION
ISSUE DATE
95-02-04
97-05-22
9
Product Specification
OM1654A
Simple zero-crossing triac control
11 ORDERING INFORMATION
PACKAGE
TYPE
NUMBER
NAME
DESCRIPTION
VERSION
OM1654A P
DIP8
plastic dual in-line package; 8 leads (300 mil)
SOT97-1
OM1654A T
SO8
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
1. NOTE:
The OM1654A replaces the OM1654. In operation it is identical however the OM1654A has one extra pin connection
(i.e. PWR, pin 7). Care needs to be taken with older designs using OM1654 where the PCB layout may make use of a
pin 7 connection for other purposes in the layout.
12 ESD CAUTION
Electrostatic Discharge (ESD) sensitive device. ESD can cause
permanent damage or degradation in the performance of this
device. This device contains ESD protection structures aimed at
minimising the impact of ESD. However, it is the users responsibility
to ensure that proper ESD precautions are observed during the
handling, placement and operation of this device.
ATTENTION
OBSERVE PRECAUTIONS
FOR HANDLING
ELECTROSTATIC
SENSITIVE DEVICES
13 DOCUMENT HISTORY
REVISION
DATE
1.0
19990915
DESCRIPTION
Released version
2.0
20021108
Add OM1654”A”
3.0
20050224
Remove reference to non-A part
4.0
20070213
HS formatting, standard ESD caution
2007 Feb 13, Revision 2.0
10
Product Specification
OM1654A
Simple zero-crossing triac control
14 DEFINITIONS
Data sheet status
Engineering sample
information
This contains draft information describing an engineering sample provided to
demonstrate possible function and feasibility. Engineering samples have no guarantee
that they will perform as described in all details.
Objective specification
This data sheet contains target or goal specifications for product development.
Engineering samples have no guarantee that they will function as described in all
details.
Preliminary specification
This data sheet contains preliminary data; supplementary data may be published later.
Products to this data may not yet have been fully tested, and their performance fully
documented.
Product specification
This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
15 COMPANY INFORMATION
HENDON SEMICONDUCTORS a trading name of INTEGRATED ELECTRONIC SOLUTIONS PTY. LTD.
ABN 17 080 879 616
Postal address:
Street Address:
Hendon Semiconductors
PO Box 2226
Port Adelaide SA 5015
AUSTRALIA
Hendon Semiconductors
1 Butler Drive
Hendon SA 5014
AUSTRALIA
Telephone:
Facsimile:
+61 8 8348 5200
+61 8 8243 1048
World Wide Web: www.hendonsemiconductors.com
www.bus-buffer.com
Email:
[email protected]
2007 Feb 13, Revision 2.0
11
Product Specification
OM1654A
Simple zero-crossing triac control
16 DISCLAIMER
Integrated Electronic Solutions Pty. Ltd. ABN 17 080 879 616 trading as Hendon Semiconductors (“Hendon”)
reserves the right to make changes to both its products and product data without notice.
Hendon makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does Hendon assume any liability arising out of the use or application of any Hendon product. Hendon
specifically disclaims any and all liability, including without limitation incidental or consequential damages. It is the
responsibility of the customer to ensure that in all respects the application in which Hendon goods are used is suited to
the purpose of the end user.
Typical performance figures, where quoted may depend on the application and therefore must be validated by the
customer in each particular application. It is the responsibility of customers to ensure that any designs using Hendon
products comply with good practice, applicable standards and approvals. Hendon accepts no responsibility for incorrect
or non-compliant use of its products, failure to meet appropriate standards and approvals in the application of Hendon
products, or for the correct engineering choice of other connected components, layout and operation of Hendon products.
Any customer purchasing or using Hendon product(s) for an unintended or unauthorised application shall indemnify and
hold Hendon and its officers, employees, related companies, affiliates and distributors harmless against all claims, costs,
damages, expenses, and reasonable legal fees arising out of, directly or indirectly, any claim of loss, personal injury or
death associated with such unintended or unauthorised use, even if such claim alleges that Hendon was negligent
regarding the design or manufacture of the relevant product(s).
Life Support Applications
Products of Hendon Semiconductors (Hendon) are not designed for use in life support appliances, devices or systems,
where malfunction can result in personal injury. Customers using or selling Hendon products for use in such applications
do so at their own risk and agree to fully indemnify Hendon for any damages resulting from such improper use or sale.
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2007 Feb 13, Revision 2.0
12
Product Specification