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Description
ZERO VOLTAGE SWITCH
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SL443A
FEATURES
I. Well defined load power/potentionmeter d4s- p1acemeflt characteristics
2. High immunity against spurious mac fiuing under noisy mains environment (automatic spike filtration) 3, Enables compliance with Cenelec EN5O.006/ B55406-1976
(A) Switching rate controlled
(B) symmetrical burst control
4. Very low external component Count
5. Triac firing pulses inhibited whilst the IC’s power supply is being established
DESCRIPTION
The externally current limited AC supply is applied to the device, and rectification followed by shunt regulation provides a 14V DC supply. This is externally smoothed before application to the 7.OV series stabiliser which feeds the resistance bridge The stabiliser must be within regulation. or operation of the Low Vcc Inhibit’ circuit will result. This circuit overrides all other circuitry and prevents unsuitable firing pulses from being supplied to the triac at ‘switch?On’, The current limited AC supply also drives the Period Pulse Generator (PPG) and zero voltage crossing circuits
The PPG produces a sinple short duration pulse for each completed mains cycle and serves two purposes, Firstly it is used to clock logic information such that the circuit behaves in a synwnetrical manner and only complete mains cycles are applied to the load. Secondly the pulse is used to switch timing components in the ramp generator and this enables long time Constants to be achieved without having to resort to the use of
electrolytic capacitors
The zero voltage crossing detector controls a pulse generator that has a delayed output The delay is necessary since, with loads that are niliitly inductive or low power resistive, the triac load current may not reach itS required holding level at zero voltage point.
Both delay and pulse duration are defined by an external capacitor and this further serves the purpose of filtering out spikes which occur in the zero crossing region Automatic rejection takes place of spikes having a duration of up to 50 per cent of the normal width of the mac firing pulse
The comparator amplifier has differential inputs and these are used to compare the potential appearing on the slider of the control potentionmeter with that of the ramp waveform The output of this amplifier controls the logic circuitry and the potentiometer setting defines the fraction Of the ramp penod for which the triac is in conduction so controlling the power in the load
Some Part number from the same manufacture
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10000 buyer reviews from United States
Heather Martinez
Length of registration:7 years
The SL443A integrated circuit is a great choice for a wide variety of applications. It is easy to use, reliable, and provides excellent performance. The circuit is well-designed and provides a wide range of features and functions. The documentation is clear and easy to understand, making it simple to configure and use. Overall, the SL443A is an excellent choice for any project.
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03/17/2023
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Warranty
All UTSOURCE purchases have a 60 days money back return policy, plus a 90 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
SL443A
SL443A has several brands around the world that may have alternate names for SL443A due to regional differences or acquisition. SL443A may also be known as the following names:
BUYING OPTIONS
Stock Status: 10000
Minimum: 2
Total Price:
Unit Price:2.79400
UTSOURCE
Country:
United States
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