4725V01

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PARAMETER

VALUE

TURN-ON VOLTAGE

0.7V TYPICAL

ISOLATION

< +/- 2,500V BIAS ON PIN 4

OPERATING TEMPERATURE

OPTIONAL EXTENDED OPERATING TEMPERATURE

STORAGE TEMPERATURE

-55º to +85ºC

OUTPUT VOLTAGE TOLERANCE

+/-3% FULL LOAD

EFFICIENCY

75% - 85% TYPICAL

INPUT CAPACITANCE

188uF (12V AND 15V in)

88uF (24V AND 28V)

FREQUENCY

25 TO 125kHz

DETAILED PRODUCT DESCRIPTION

The new FS Series of isolated, proportional DC to high voltage DC converters

offers stout design and enhanced features for excellent long-term reli-

ability. Outputs ranging from 200V through 6kV are offered in miniature,

cost-effective, PC-mount packages. Based on XP EMCO’s proven high-

reliability, high voltage power conversion topology, the FS Series boasts a

full ten watts of output power for each model and features a low 0.7V turn-on

voltage. The output voltage is proportional to the input voltage, from turn on

to maximum output voltage, enabling easy control of the high voltage. XP

EMCO’s proprietary, quasi-sinewave, resonant oscillator produces clean,

reliable high voltage with inherently low ripple, low EMI/RFI, low input ripple

current, and low conducted emissions. The frequency of the oscillator is

stable throughout the operating range, allowing for easy additional filtering,

and always operates well above the audio frequency range.

This series features sturdy, galvanic input-to-output high voltage isolation,

conservatively rated at +/-2,500V + Vout with less than 100pF of coupling

capacitance and less than 100nA of leakage current. Robustness and high

reliability have been designed into each model by incorporating output

arc surge current limiting and short circuit protection. Careful control over

internal voltage gradients extends the useful life calculated. Mean time

between failure (per Bellcore TR-332) exceeds 840,000 hours.

In addition, the internal transformer temperature and input voltage are

actively monitored with supervisory circuits and fed into a shutdown circuit,

preventing excessive input voltage or over-temperature failures. Should

preset limits be exceeded, the module will automatically shut down and

issue an error signal on pin 6 (TTL high).

When the fault condition is removed, the unit restores itself to normal

operation, ensuring maximum reliability in the field. However, the pin 6

error signal will remain high until reset by power cycling the +5V logic.

The fault monitor circuit is powered by an external 5V to allow for 0.7 to

full input voltage proportional operation of the high voltage converter. The

FS Series also features an enable/disable function. A TTL high signal on

Pin #8 disables the high voltage output.

High power conversion efficiency, coupled with low internal thermal

resistance, creates a vigorous package able to withstand wide operating

temperatures. A unique integrated anodized aluminum heatsink surface

features two threaded blind inserts, which allow for optimal thermal manage-

ment via external heatsink for high temperature operation and/or convenient

chassis mounting configurations. A special proprietary encapsulating formula

optimizes internal dielectric strength that is UL-94V0 compliant while low

thermal resistance minimizes internal component temperature rise, resulting

in a robust module optimized for long-term reliability.

FS SERIES