UC3702 Unitrode, UC3702 Datasheet
UC3702
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UC3702 Summary of contents
Page 1
... BLOCK DIAGRAM SLUS368 - APRIL 1997 DESCRIPTION The UC3702 Quad Relay Driver is intended to drive up to four relays from logic inputs using an unregulated relay voltage supply. The relays are driven from the Bus supply in a power efficient PWM converter fashion. The relay coil is used as the inductive element. (See the application's sec- tion concerning the relay selection ...
Page 2
... Currents are positive into, negative out of the specified termi- nal. Consult Packaging Section of Databook for thermal limita- tions and considerations of packages. ELECTRICAL CHARACTERISTICS: UC1702; –25°C to +85°C for UC2702; 0°C to +70°C for UC3702; VBUS = 34V, VCC = 5V, RESET = VCC 43. 203k ; CT = 220pF ...
Page 3
... UC3702 must be the same. (It is permissible to use coils with different rated series resistances with a single UC3702, so long as the rated coil voltages are the same and care is taken with respect to the relaxation times of the different relay coils). Output transients are slew rate limited to decrease electro-magnetic radiation ...
Page 4
... When performing an engineering evaluation of the UC3702 in a system useful to have a current probe. Alternately resistor can be placed in series with the relay coil in the prototype and differential voltage probes ...