Energy Saving Quad

 

Energy Saving Quad

IV. OPEN LOAD DETECTION IN OFF STATE

In order to stumble on the open load fault in OFF state a pull-down resistor ought to connect among the PGND line and the output pin (see Figure five). In a normal circumstance, the current flows thru the community made of the pull-down resistor and the burden. The voltage across the weight is much less than the minimal open load voltage, so the OL pin is saved excessive degree.

When an open load happening occurs to one of the output, the voltage of the applicable output pins rises to a fee lower than the minimal open load voltage and the fault situation is said at the OL pin after a blacking time (tBKT), to reduce a sound interference. After this time the OL pin goes low to level, as a consequence signalizing the open load.

In fig. 6 we display the waveforms of the accepted Input pin voltage, the applicable Output voltage and the OL pin energy when an open load event occurs and while it finish.

In parent 7 you may see the open load in OFF country capability. The output voltage has been involuntary from 0V to 10V with a frequency of 10kHz with a view to simulate the open load condition. In this discern the VOL is going down after the tBKT time (Typ. Sixteen.Five ms). 

V. REFERENCE BOARD AND APPLICATION TESTS

In determine 9 a normal utility circuit of the tool IPS4260L is pronounced; it represents the output degree of a programmable logic controller designed for industrial automation or system manage. We offer an User Manual and a commit graphical person interface (GUI) to force it.

In order to protect the tool in low-aspect configuration from the cruel commercial conditions of electricity deliver lines, typically optocouplers diodes are used to separate the application manipulate

circuits from the energy supply, as nicely within the inputs as within the diagnostic jots.

Transil diodes defend the Low Side Switch (LSS) in opposition to both effective and terrible surge pulses to brand the device compliant with IEC 61000-four-5.

An electrolytic capacitor must be located at the bus line (Vcc) to be able to clear out bus inductance effect making supply voltage solid and avoiding under voltage close-down.

The length of the electrolytic capacitor is chosen primarily based on the slope of the output present day, the impedance of the complex strength supply cables, as well as the most allowed voltage drop across the device. A low ESR capacitor is recommended, as close as feasible to the LSS, with the intention to filter the energy supply line for electromagnetic compatibility worries. In our instance a 47uF capacitor has been decided on.

The toughest hundreds may be pushed in manufacturing facility automation/manner manipulate are the inductive ones; it's far a commonplace case to drive 1.15 Henry nominal load. The related electricity to manage such inductive hundreds is very appreciable, wearing out a sensible electricity dissipation and a totally high junction temperature: IPS4260L was just designed to drive this type of massive loads using an outside Zener or TVS diode connects between VZ pin and GND or Supply rail to discharge the burden in fast manner (see discern 2) or must join the Vz pin to deliver rail to discharge it in sluggish way.

Over-modern-day and quick circuit of the load to the supply voltage are the most harsh occasions we need to face at some point of the virtual output operation. In those horrific occasions, the output tiers have to live on dissipating all the associated power. Besides the hundreds, related to the output stages, should be covered from the height of present day that might attain unexpected values.

In order to soundly control very excessive peaks of currents throughout quick circuit of outputs to the deliver voltage a contemporary obstacle block is included on chip. As end result handiest a cutting-edge spike for a short time is permitted; just the time needed to interfere the contemporary problem circuitry, so trimming the most output contemporary the use of an outside resistor.

It is the identical in the course of a tough over-load. Internally constrained output current isn't enough but; in truth, if short circuit or over-load length remaining all through the time, the energy dissipated into the device in addition to into the load, end up critical so causing an over-heating able to damage the device and/or the load involved.

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