Teach you how to design amplifier of more delicate and cabinet big electric current
[introduction] normally, when defining a kind of new parts of an apparatus or appliance to allow in order to reach strict car mark, our group can see other need the system of same function, and we are met the design crosses all parts of an apparatus of these application. The group that this is us develops new-style ALM2402 (the amplifier of operation of double big electric current that designs for car application only (carry is put) ) when the situation that produce.
When defining ALM2402, we realize a lot of cars and industrial system all need a kind but sex of capacitance of drive big electric current or the carry with electric laden sensibility are put.
In the past, often ask to design personnel to satisfy this kind of need with schism component. Should design amplifier of a kind of simple big electric current with schism component, you need amplifier, ambipolar knot transistor (BJT) with diode. The graph is shown 1 times is a such example, use at electric machinery driver to apply normally.
Should implement plan but drive is analytic implement (with will measure corner of electric machinery axis coming back to spend) excitation coil. You can find amplifier to design in a lot of cars and industrial application (if drive report is perceptual laden) . This kind of typical solution can be in circuit board space and output transistor slant buy side brings a challenge to design personnel.
In addition, still need to offer add circuit to protect a function in order to had realized electric current, this increased schism to carry out the dimensional challenge of plan. Had done not have electric current to protect a function, this system can run “ dumb ” . If do not have any protective functions, still will continue burn down power source.
Graph 1: The schism of drive excitation coil implements plan
To compare, let us see a picture 2 show the ALM2402 that is used at drive excitation coil to implement plan. Very simple, right incorrect? Need not of exterior transistor slant buy, ALM2402 is most but the electric current of drive 400mA carries every channel. This circuit volume is very minor, park 3mm×3mm DRR is enclosed in, make design staff can the integral solution size that utmost ground reduces them.
Graph 2: Introduce the excitation coil drive of ALM2402-Q1
In application of drive of big electric current, protecting a function is crucial requirement. ALM2402 is compositive a variety of systems protect a function, include the following line:
Compositive cross electric current to protect a function
Output functions of pair of batteries short circuit, applicable circumstance: When the power supply that receives parts of an apparatus repeatedly from batteries when series connection diode cites a base. Cross lukewarm protection function, can pass parts of an apparatus or appliance, applicable circumstance: When layout makes mistake or the environmental temperature in the system sets more than.
In addition, the mark of this parts of an apparatus brings a foot to have a kind of convenience function, have a variety of use. When too lukewarm incident happens, mark annals brings a foot to turn into low n, allow an user to devise feedback mechanism thereby in order to shut a system.
These returning but from next exterior pulling mark brings a foot to be put in order to shut carry, make carry is put enter Morpheus mode, use up very few electric current. crucial to power comsumption batteries application, this function is very useful.