UC1846-SP - Current-Mode PWM Controller

The UC1846-SP control devices provide all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel power modules while maintaining equal current sharing.

Protection circuitry includes built-in UVLO and programmable current limit in addition to soft-start capability. A shutdown function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off.

Other features include fully latched operation, double-pulse suppression, deadline adjust capability, a ±1% trimmed bandgap reference, and low outputs in the OFF state.

• QML-V Qualified, SMD 5962-86806
• 5962P8680603VxA:
  • Radiation Hardness Assurance (RHA) up to 30-krad(Si) Total Ionizing Dose (TID)
  • Passes Functional and Specified Post-Radiation Parametric Limits at 45 krad at LDR (10 mrad(Si)/s) per 1.5× Over Test as Defined in MIL-STD-883 Test Method 1019.9 Paragraph 3.13.3.b
  • Exhibits Low-Dose Rate Sensitivity but Remains Within the Pre-Radiation Electrical Limits at 30-krad Total Dose Level, as Allowed by MIL-STD-883, TM1019
• Automatic Feed-Forward Compensation
• Programmable Pulse-by-Pulse Current Limiting
• Automatic Symmetry Correction in Push-Pull Configuration
• Enhanced Load Response Characteristics
• Parallel-Operation Capability for Modular Power Systems
• Differential Current-Sense Amplifier With Wide Common-Mode Range
• Double-Pulse Suppression
• 500-mA (Peak) Totem-Pole Outputs
• ±1% Bandgap Reference
• Undervoltage Lockout (UVLO)
• Soft-Start Capability
• Shutdown Terminal
• 500-kHz Operation