SERIES SAR

• Ultra-Miniature Case
• 100 to 1500 VDC Output
• Adjustable Single Output with Center Tap
• Isolated 3W Output Power
• Line Regulated
• Minimal Load Change Effect
• High Efficiency to 82%
• Low Output Ripple
• 1500VDC Input/Output Isolation
• Input Over/Under Voltage Shutdown
• Internal Over Temperature Protection
• Wide Operating Temperature: -25°C to +70°C (Optional : -40°C to +85°C)
• Thru Hole and Surface Mount versions available
• Epoxy Encapsulated

DIMENSIONS:

Thru Hole: 1.10" x 0.80" x 0.425" Typical (WxDxH)
Surface Mount: 1.10" x 0.80" x 0.45" Typical (WxDxH)
Typcial Weight: 12 Grams (Typical)

OPTIONS AVAILABLE :

• Expanded Operating Temperature: -40°C to +85°C and other military options available Per Mil.Std. 883
• Stabilization Bake (at +125°C ambient) - Method 1008
• Thermal Cycle (between -55°C and +125°C) - Method 1010 Condition B
• High Temperature Burn-In - Method 1015
• Vibration, Shock, Humidity, and Altitude per Mil Std 202
• Contact factory to submit any additional requirements for review:
  

  Phone: (800)431-1064
  Email:info@picoelectronics.com

OTHER CHARACTERISTICS:

Input Voltage Nominal (Vin, Nom): 5VDC, 12VDC, 24VDC
Input Voltage Range: 5 to 10VDC, 7.5 to 15 VDC, 18 to 36 VDC
Output Voltage Nominal Tolerance: +/-3% VO, Max. at Full Load
Output Power: Max 3W over entire Vin Range
Output Ripple: Max 0.5% Vout Max
Line Regulation: Yes, Less than 0.5% Vout Max.
Load Regulation: 5% Vout Max from No Load to Full Load (Typical)
Converter Frequency: Fixed, Changes with Model from 125kHz to 450kHz
SHDN Pin Current/Voltage for Shutdown: Vshdn<0.4V; Ishdn>0.5mA (Sink Capability)
Over Temperature Shutdown: 105°C (Internal Temperature)
Output Temperature Coefficient: 0.02% Vout, Nom/°C
Input/Output Isolation: 1500VDC
Isolation Resistance: 100MOhm (Min.)
Operation Temperature: -25°C to +70°C
Storage Temperature: -55°C to +125°C
Optional Operating Temperature: -40°C to +85°C

• Ultrasonic Transducers
• Avalanche Photodiodes
• Electron Beam Deflection
• Spectroscopy

• Photomultipler Tubes
• Capacitor Charging
• Electrostatic Lenses
• Piezo Devices

All Dimensions are Typical

The SAR Series of DC-DC High Voltage Converters is based on a two stage design. The first stage is a low voltage Buck Converter that produces a regulated and adjustable voltage (Vbuck) to be stepped-up by the second stage; a fixed step-up ratio DC-DC transformer. The DC-DC transformers consists of a Push-Pull oscillator, synchronized at half the buck frequency, a step-up transformer, followed by a rectifier/multiplier and a filter circuit. It has no active regulation circuit. However, due to a resonant design, it exhibits a very low load effect.

A high impedance programming input (Vadj) controls the Buck Conerter output and allows for 0V to maximum voltage adjustment. The Buck Converter features excellent line regulation an any Vadj level and over the entire input range.

Overal, the SAR Series will provide 0V to Max. HV adjustability with tight input regulation across the input range and a minimal load effect.

The following are designed in functions that increase module versatility:

• SHDN Input, pulled down will turn off the unit
• REF Output, 3V +/-5% on board reference voltage simplifies programming
• Thermal Shutdown
• Input Over/Under Voltage Shutdown
• Over Programming protection

A resistor connected from ADJ pin to ground will decrease the output voltage. The following formula shows, with reasonable accuracy, the relation between Vout and Rprog, where Rprog is in kohm:

For instance, to adjust to 25% Vout,Max., Rprog is 21kohm, for 50% is 62kohm, and for 75% it is 187kohm.

NOTE: Resistor Programming in not available for 24SAR Modules

A voltage source to ADJ pin will program the output voltage linearly. 0V ADJ corresponds to 0V OUT and 3V ADJ corresponds to Vout,Max. The following formula applies:

Vprog [V] is the voltage applied to ADJ pin.

The REF output is useful for programming purposes. A resistor divider or potentiometer could make the circuit for voltage adjustment. In order to keep programming error low, it is recommended for the overall resistance of the divider to not exceed 5kohm.