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Número de pieza | IES5521A | |
Descripción | Simple Zero Crossing Triac Control Circuit | |
Fabricantes | IES | |
Logotipo | ||
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No Preview Available ! Integrated Electronic Solutions
abbing IC’s fo
35Years
IES5521A
Simple Zero-Crossing Triac Control
Circuit with Adjustable Time-out
1 FEATURES
3 GENERAL DESCRIPTION
• Time-out function stops triac operation after a set time. The IES5521A is a derivative of the OM1654A, but offering
• Reset time-out by turning mains supply off and on.
• Low external component count
the extra safety feature of a nominal 1 hour time-out. This
is a key safety requirement for a range of personal and
home appliance applications. The time-out function will
• Constant ON cycle time, with proportional OFF time
stop the triac operation and thus prevent power from being
• All ON cycles consist of an integral number of mains
applied to the heating elements.
cycles
• No DC component in the mains supply
m• On chip circuit protection against triac gate spikes
• Low supply current requirement
o• Sensor AC powered, thus minimising DC supply and
.cfiltering needs
• Separate power supply input, allowing easy gate pulse
width adjustment
U• Accurate time-out using the mains frequency, or widely
t4adjustable external “RC” time-out.
e2 TYPICAL APPLICATIONS
e• Temperature control of cooking or heating appliances.
h• Hair styling tools (straighteners, driers, curling wands ..)
• Electric Irons
S• Toaster Ovens, Rice Cookers, Hotplates, Fry Pans, etc.
ta• Electric Blankets, Heating Pads, etc.
• or other appliances where a safety time-out is required.
a4 BLOCK DIAGRAM
Time-out can be accurately controlled from the AC supply
frequency for a period of 1 hour (60Hz, or 71minutes at
50Hz), or can be adjusted by adding external resistor and
capacitor components to set the frequency of an on-chip
RC oscillator. In this manner, time-out periods from 1
minute to more than 5 hours, are possible.
The IES5521A 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
thermistor. In a typical application it can be used for the
temperature control of a heating element in a cooker or
another home heating appliance.
It is designed to control a suitable triac with a resistive load
ranging from 400 watts on a nominal 220/250 volt mains
supply. It can also be easily applied to 120Vac mains
applications.
.D Neutral
wNTC
100k
ww@25°C
Rb
θ RV1
100k
SENS 4
latch
zero
crossing
control
logic
GATE
2
Vcc
3
stabalised
8 AC
330k
Rc 0.25W
7 PWR
Rd* 100k
0.6W
Triac
BT134-600E
Load
C2
47uF
10V
IES5521A 6
Ra CAP
C1
100nF
2005 Dec 12
time-out
timer
5
RC
Rtc C3
−6.5V
* If required
Fig.1 Block diagram
1
DC supply
6.5V
.com1
Vee
heet4UIES5521A-block cct3
230Vac
mains
Active
www.DataSProduct Specification
1 page Integrated Electronic Solutions
abbing IC’s fo
35Years
IES5521A
Simple Zero-Crossing Triac Control
Circuit with Adjustable Time-out
8 CHARACTERISTICS
At Tamb = 25°C; Voltages are specified with respect to pin 3 (VCC)
SYMBOL
PARAMETER
CONDITIONS
Power supply
−VEE
−IEE
supply voltage (operating)
supply current (operating)
excluding gate drive.
470kΩ pull-up on
RC.
Gate drive
IGATE
gate current (triac T1 to VCC) VGATE = VCC
Zero crossing detection
IAC +ve threshold
−VAC
−ve threshold
Timing capacitor
−ICAP
discharge current
−VUT
upper threshold
−VLT
lower threshold
ICAP charge current
Sense input (Figure 4)
ISENS = −20 µA
−VSENS
sense voltage
−VSENS
sense voltage
−∆VSENS/ oC temperature sensitivity
VSENS(rms) AC sense voltage
VSENS(rms) AC sense voltage
VSENS(rms)
VSENS(rms)
VSENS(rms)
VSENS(rms)
AC sense voltage
AC sense voltage
AC sense voltage
AC sense voltage
RC input (Figure 6)
ISENS = −20 µA
duty cycle = 50%
Duty cycle = 5%
Duty cycle = 25%
Duty cycle = 50%
Duty cycle = 75%
Duty cycle = 95%
Duty cycle = 100%
−IRC
−VRCTU
−VRCTL
fOSC
tTO
charging current
RC threshold - upper
RC threshold - lower
oscillator frequency
time-out time, IES5521A
At RC pin
R4=470k, C3=100nF
R4=470k, C3=100nF
Mains Frequency Timing (R4=470k, Figure 5)
tTO
time-out time, IES5521A
fMAINS = 60Hz
fMAINS = 50Hz
MIN
6.3
−
10
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
0.4
−
−
3550
4260
TYP MAX UNIT
6.9 7.6 V
µA
210 270
12.5 - mA
66 − µA
−6.4 − V
1
1100
VEE+1100
150
2.2 µA
− mV
− mV
− µA
1000
575
2.2
0.47
0.48
0.50
0.53
0.65
0.73
− mV
− mV
− mV/oC
− V(rms)
− V(rms)
− V(rms)
− V(rms)
− V(rms)
− V(rms)
340
2.4
0.6
15.42
3454
810 µA
3.0 V
−V
− Hz
−s
− 3550 s
− 4260 s
2005 Dec 12
5 Product Specification
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet IES5521A.PDF ] |
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