SPECIFICATION OF THE 011194 +34V 150°C SWITCH MODE POWER SUPPLY

LAST REVISON AND DATE: 01. 022/01/2002

01-1-1-9-4 Electrical Specification at 150°C

• DC input voltage range. (See note 1). 12V to 150V
• Output voltage 1. (See note 2) +34V (± 3%)
• Output voltage 2. (See note 3) +33V (± 3%)
• Output current. +735mA
• Output power. 25 Watts
• Output noise. (See note 4). 400mV RMS
• Minimum thermal shutdown temperature. (See note 5) 160°C
• Short circuit protection. Continuous

01-1-1-9-4 Maximum Specification at 150°C(See note 6)

• DC input voltage range. (See note 1). 12V to 170V
• Output voltage 1. (See note 2) +34V (± 3%)
• Output voltage 2. (See note 3) +33V (± 3%)
• Output current. +900mA
• Output power. 30 Watts
• Output noise. (See note 4) 600mV RMS
• Minimum thermal shutdown temperature. (See note 5) 160°C
• Short circuit protection. Continuous

Mechanical Dimensions

Mechanical dimensions and tolerance are detailed in drawing 01-1-1-9-4.

Pin Out

Inputs and outputs are described by drawing 01-1-1-9-4.

Encapsulation

All power supplies are encapsulated to improve the mechanical strength of the case and protect the power supply from the drilling environment.

Temperature

The operating temperature range shall be -21°C<TEMP<151°C. The maximum rate of change of temperature shall not exceed 5°C per minute. Survival temperature shall be 175°C, operating.

Operating Environmet

The power supply will continue to meet this specification for three hundred and fifty hours at 150°C and 150V DC. Minimum life expectancy within a 150°C Oil field environment shall exceed three hundred and fifty hours.

Qualifying Vibration Test

Either powered or unpowered, the power supply shall survive the following qualifying sine vibration test at ambient temperatures. 20g rms for four hours per axis, swept sine from 10Hz to 2KHz. Three tests in all for a total of twelve hours.

Alternatively, the unit shall survive a random vibration test of 20g rms for four hours per axis at 0.2g² per Hz from 10Hz to 2KHz. Three tests in all for a total of twelve hours at ambient temperatures.

Screening Vibration Test

Either powered or unpowered, the power supply shall survive the following screening sine vibration test at ambient temperatures. 10g rms for four hours per axis, swept sine from 10Hz to 2KHz. Three tests in all for a total of twelve hours.

Alternatively, the unit shall survive a random vibration test of 10g rms for four hours per axis at 0.05g² per Hz from 10Hz to 2KHz. Three tests in all for a total of twelve hours at ambient temperatures.

Qualifying Shock Test

The power supply shall survive three shocks per axis. Each shock shall be 1000g, 0.5ms half sine wave. Nine shocks in total.

Screening Shock Test

The power supply shall survive one shock per axis. Each shock shall be 1000g, 0.5ms half sine wave. Three shocks in total.

Shock and Vibration Life Expectancy

Screening levels of shock and vibration will not cause power supply failure within three hundred and fifty hours service life.

Humidity

Because the input and output pins are exposed, it is the customer's responsibility to ensure these terminations are properly sealed against moisture after manufacture into their equipment.

Thermal Shutdown

Thermal shutdown shall not occur below 160°C with the power supply fully loaded and the input voltage at 40V. The power supply is capable of supplying a regulated output above 160°C, but this depends upon output load and input voltage. Above an ambient temperature of 150°C output performance is not guaranteed. See performance envelope for clarification.

Notes

1. The minimum start up voltage is 12V and regulation only occurs when Vin > Vout.
2. The regulated output voltage from VOUT.
3. The regulated output voltage from SUMOUT. Note that Sumout is one diode drop away from Vout and is used to connect two or more psu's in parallel to drive loads greater than twenty five watts.
4. Output noise is quoted at 70V with an output capacitance of 40µF internal to the power supply and a noise measurement bandwidth of 10MHz. A peak switching noise of 1000mV rms may occur when Vin is only slightly greater than Vout. (See noise graph)
5. The power supply is designed to monitor its own internal temperature and shutdown if it exceeds a safe maximum. Once cooled, the power supply will self start. The minimum shutdown temperature is 160°C for an input supply of 40V and an output load of +900mA.
6. To avoid premature failure of the power supply, it is the customer's responsibility to ensure these maxima are not exceeded for more than five minutes at 150°C. The high voltage maximum must never be exceeded.