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Description
The 31-70221 is a fixed frequency Pulse Width Modulator based on the industry standard UC1843x Series with significant enhancements in performance and functionality. It operates in either the voltage or current mode and can support a wide variety of converter topologies. Radiation hardened by design techniques ensure outstanding radiation tolerance (>1MRads) while reducing operating current by more than an order of magnitude over comparable parts. The PWM5031 provides under voltage lockout with hysteresis, an output to indicate power is OK, and features such as Sleep to power down the entire chip, Enable to shut down the oscillator/output drives, Soft to drive the output to zero, and ENAUX to disable the output to the auxiliary op-amp. The chip's 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.
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 31-70221 is suitable for a wide range of applications including Buck, Boost, Flyback, Forward, and Center Tapped Push-Pull Converters. It is designed for commercial, industrial, and aerospace applications.
Comparison
Advantages- Enhanced performance and functionality
- Outstanding radiation tolerance (>1MRads)
- Reduces operating current by more than an order of magnitude
- Dual output drivers capable of sinking and sourcing 50mA constant current
- Supports a wide variety of converter topologies
Disadvantages- Contact factory for die availability
- DSCC SMD pending
- Radiation Hardness:
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Similar parts: 430483 , Click to view
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Datasheet
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Shopping guide
Delivery period:
- - Will ship out in 2-3 days
- - DHL Express: 3-7 business days
- - DHL eCommerce: 12-22 business days
- - FedEx International Priority: 3-7 business days
- - EMS: 10-15 business days
Shipping fee:
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Shipping option:
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Popular parts of the same kind
- Datasheet: Download 31-70221
- Chipdatas Part: CD91-31-70221
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
- Free Shipping: Yes
- Prority Shipping: Yes, 3-5 days
- Last Updated: 2024/10/14 10:23 +0800
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- Full Refund if you don't receive your order
- Full or Partial Refund , If the item is not as described
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The fee is charged according to the rule of PayPal.
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