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• Precision output voltage from 0 to 1kV thru 0 to 15kV
• 4, 15/20, or 30 watts of output power
• Maximum Iout capability down to 0 Volts
• Wide input voltage range
• PPM level line regulation and load regulation
• Indefinite output short-circuit protection
• Output current monitor
• Fixed-frequency, low-stored-energy design
• <10ppm ripple
• 10ppm temperature coefficient and reference

GENERAL INFORMATION:

The "E" Series of high-voltage, regulated DC-DC converters addresses the needs of the precision high-voltage-power supply user. Based on the "A" Series, the "E" Series is designed and built utilizing state-of-the-art power conversion topology. These units feature surface mount technology and encapsulation techniques providing high reliability and low cost.

DESIGN METHODOLOGY:

The "E" converters utilize a dual-ended forward converter topology with a nominal switch frequency of <100kHz. A precision reference is provided so the remote control can program the power supply for a specific voltage. Once input voltage stabilizes, under-voltage lockout is released. As soon as enable is raised above a TTL 1, the converter begins to switch. The soft-start circuit brings the converter to full power over a 1mS period, reducing surges on the source supply.A constant-frequency PWM regulation system controls the MOSFET push-pull power stage, which drives the high voltage transformer. The power stage is protected from output current overloads or short circuits via a secondary current limit circuit.High voltage is developed by a multistage multiplier while feedback voltage is developed and sent to the CTRL circuit to maintain regulation. Multi-stage internal filters are provided to reduce input current ripple and output voltage ripple.

WIDE INPUT AND OUTPUT RANGE:

The "E" Series has a wide input range of +23 to +30VDCand will maintain full power output without derating. See Application Note 16 for protection information.The "E" Series is a non-isolated, unipolar converter. Positive or negative output must be specified. Output voltage is adjustable from 0 to 1kV, 2kV, 4kV, 6kV, 10kV, or 15kV. As the output voltage is reduced towards 0, the maximum current capability remains unchanged.

OUTPUT CURRENT MONITOR:

The "E" Series features a precision-buffered output current monitor calibrated to 0.1% accuracy. Current from the high-voltage appearing between Output Monitor pin 12 and Signal Ground multiplier can be monitored by reading the voltage Return pin 15.

REMOTE CONTROL:

The "E" Series is remotely programmed with 0 to +10 VDC to produce an output voltage. Input may be from a control voltage, a DAC, or from a variable or fixed resistor. Connections are on the converter for the internal reference, analog remote adjust and the signal ground. The reference is a precision-buffered temperature compensated +10VDC. See Figure A & B and Application Note 1 for more information.

STANDBY MODE:

The "E" converters also have an enable function. When the enable is TTL 0 (<+0.7V Isink=1mA) the converter is in a standby mode and input current is reduced to <0.04 mA. All functions other than the internal reference are shut down. If the enable pin is connected to a TTL 1, or at greater voltages up to +32VDC the converter operates normally.

MECHANICAL:

"E" Series converters are in chassis mountable aluminum cases requiring a footprint of 25.4 in2 and 50.7 in3 of volume. See Application Note 6 for thermal considerations and mounting configurations.

ENVIRONMENTAL:

The "E" Series provides full power and performance operation at case temperatures from +10 to +45°C. All units receive a 24-hour burn-in prior to final testing. Extended temperature

range is available along with other enhanced capabilities. Please contact the factory.