Description

The 31-71042 is a fixed frequency Pulse Width Modulator based on the industry standard UC1843x Series. It operates in either voltage or current mode and supports various converter topologies. The chip is radiation hardened with outstanding radiation tolerance of over 1MRads. It has a low operating current compared to similar parts, reduced by more than an order of magnitude. The PWM5031 features an under voltage lockout with hysteresis, a sleep function to power down the chip, an enable input to shut down the oscillator/output drives, a soft input to drive the output to zero, and an ENAUX input to disable the output to the auxiliary op-amp. The chip has dual output drivers with a Totem Pole output capable of sinking and sourcing 50mA constant current and peak currents up to 1 Amp, making it compatible with a variety of Power MOSFETs.

Specifications and features

- Radiation Hardness: Total Dose 1MRad(Si), Single Event Upset (SEU) 100MeV-cm2/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

Application Scenarios

The 31-71042 chip is suitable for various power converter applications such as buck, boost, flyback, forward, and center tapped push-pull converters. It can be used in commercial, industrial, and aerospace applications due to its radiation tolerance and performance enhancements.

Comparison

- Radiation hardened design with exceptional radiation tolerance
- Wide compatibility with different converter topologies
- Low operating current compared to comparable parts
- Dual output drivers capable of sinking and sourcing high currents
- Suitable for commercial, industrial, and aerospace applications

- Die availability needs to be confirmed with the factory
- DSCC SMD pending