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UC1702 Scheda tecnica(PDF) 4 Page - Texas Instruments

Il numero della parte UC1702
Spiegazioni elettronici  Quad PWM Relay Driver
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Produttore elettronici  TI [Texas Instruments]
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UC1702 Scheda tecnica(HTML) 4 Page - Texas Instruments

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UC1702
UC2702
UC3702
Although the inductance may not be specified in the re-
lay datasheet, it is very repeatable since it is determined
by the number of turns and geometry of the relay.
The relay’s coil inductance divided by its series resis-
tance is the relay coil’s relaxation time constant. It is im-
portant that the relaxation time constant be at least an
order of magnitude longer than the nominal switching pe-
riod of the UC3702 to obtain a constant current through
the relay coil. This means that some relays may be
ill-suited for use with the UC3702.
For example, a common 12V industrial relay has a series
resistance of 500
and a coil inductance of 500mH. Its
relaxation time constant is 1ms, an order of magnitude
less than the period of a 10kHz oscillator.
When performing an engineering evaluation of the
UC3702 in a system, it is useful to have a current probe.
Alternately, a 1
resistor can be placed in series with the
relay coil in the prototype and differential voltage probes
can be used to observe the coil current. (Do not use a
large series resistor, as this will impact observed relax-
ation time constant.)
Layout Considerations
The layout of the printed circuit board and good decoup-
ling of the power supplies is critical to proper operation of
the UC3702. For best results, high quality 4.7 F tanta-
lum capacitors should be placed as close as possible to
the VCC and the VBUS pins.
In addition to decoupling considerations, the R1 and R2
pins are sensitive to capacitive coupling from any of the
driver outputs (OUTA - D) which can slew at speeds of
300V/ s. The external resistors R1 and R2 should be
placed as close as possible to their respective pins.
Avoid routing the outputs directly past these pins without
a low impedance trace (such as GND, VCC, or VBUS) in
between to act as a capacitive shield.
APPLICATIONS INFORMATION (cont.)
Typical Microcontroller Application Driving 12V Industrial Relays
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
UDG-96010-1


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