Standard Products
PWM5031 RadHard High Speed PWM Controller
www.aeroflex.com/Power
August 2, 2005
FEATURES
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Radiation Hardness:
- Total Dose 1MRad(Si)
- Single Event Upset (SEU) 100MeV-cm
2
/mg
CMOS Low Power Design
Sleep & Enable Control Lines
Optimized for Applications: Buck, Boost, Flyback, Forward and Center Tapped Push-Pull Converters
Supports Current Mode or Voltage Mode Operations
Selectable 50% / 100% Duty Cycle
Under-Voltage Lockout with Hysteresis
Dual ±1Amp Peak Totem Pole Outputs
1 MHz Maximum – User Selectable
Low RO Error Amp
Auxiliary Op Amp with Shut Down Pin
Power OK Indicator
Designed for Commercial, Industrial and Aerospace Applications
Ceramic 24-Gull lead, Hermetic Package, .6L x .3W x .13H
- Contact Factory for Die Availability
DSCC SMD Pending
NOTE: Aeroflex Plainview does not currently have a DSCC Certified Radiation Hardened Assurance Program
Developed in Partnership with JHU/APL and the Technology Application Group for the Mars Technology
Program; Part of NASA’s Mars Exploration Program
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OVERVIEW AND GENERAL OPERATION
The chip is a fixed frequency Pulse Width Modulator based on the industry standard UC1843x Series with significant
enhancements in performance and functionality. The chip operates in either the voltage or current mode and can
support a wide variety of converter topologies.
Radiation hardened by design techniques ensure the chip’s outstanding radiation tolerance (>1MRads) while
reducing operating current by more than an order of magnitude over comparable parts.
The PWM5031 provides an under voltage lockout feature with hysteresis that also provides an output to indicate
Power is OK. An input called Sleep is used to power down the entire chip, the Enable input is used to shut down the
Oscillator / Output Drives, and the Soft input drives the Output to zero. There is also a signal input called ENAUX
that is used to disable the output to the auxiliary op-amp.
The dual output drivers are designed using a Totem Pole output capable of sinking and sourcing 50mA constant
current and peak currents up to 1 Amp to support a large variety of Power MOSFETs.
Additional features that boost the appeal and utility of the part are:
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Dual break-before-make Totem Pole output stage is employed that virtually eliminates cross conduction and
current shoot through
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Logic level input that allows the user to select either 50% or 100% maximum duty cycle operation
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Improved oscillator stage that vastly increases waveform linearity and reduces output voltage error
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Uncommitted on-board op-amp which can be used for signal conditioning, pulse feedback, or any other user
defined purpose
SCD5031 Rev B
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
