Taurus HC Series, Page 3

Part No. 01–001 Rev. 4.0_082803

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•Patented single-stage power conversion architecture, control,

and magnetic design allow unprecedented power density and

efficiency in an isolated power supply.

• An advanced microcontroller reduces parts count while

adding features, performance, and flexibility in the design.

•Low common-mode noise as a result of lower capacitance in

the transformer compared to planar magnetics and metal

baseplate designs.

• Higher reliability than planar transformer designs that can

suffer from via fatigue from thermal cycling, and metal

baseplate designs with board to board interconnects that are

subject to mechanical stress on electrical connections.

Application Notes

Protection and Control

Valid Input Voltage Range:

The converter measures the input voltage and will

not allow operation outside of the input voltage

specification. As shown by the graphs, hysteresis is

added to both the high and low voltage to prevent

the converter from turning on and off repeatedly

when the voltage is held near either voltage

extreme. At low line this assures the maximum

input current is not exceeded; at high line this

assures the semiconductor devices in the converter

are not damaged by excessive voltage stress.

ON/OFF Logic Option:

The ON/OFF control logic can be either Negative

(standard) or Positive to enable the converter. For

Negative logic, the ON/OFF pin is brought below

1.0V with respect to the -INPUT pin to enable the

converter. The pull-down must be able to sink

100

µA. For Positive logic, the ON/OFF pin is

brought to greater than 4.0V with respect to the

–INPUT pin and be limited to less than 10V. To

request the Positive logic version, add the suffix (P)

to the standard part number. The ON/OFF pin has a

built-in pull-up resistor of approximately 100k

Ω to

+5V.