UC1842A-SP Datasheet | Texas Instruments

Features - 1 QML Class V (QMLV) Qualified, SMD 5962-86704 - Rad-Tolerant: 30-krad(Si) TID (1) (2) - Optimized for Offline and DC-to-DC Converters - Low Start-Up Current (< 0.5 m A) - Trimmed Oscillator Discharge Current - Automatic Feed Forward pensation - Pulse-by-Pulse Current Limiting - Enhanced Load Response Characteristics - Undervoltage Lockout (UVLO) With Hysteresis - Double-Pulse Suppression - High-Current Totem-Pole Output - Internally-Trimmed Bandgap Reference - 500-k Hz Operation - Low RO Error Amplifier 2 Applications - DC-DC Converters - Supports Various Topologies: - Flyback, Forward, Buck, Boost - Push-Pull, Half-Bridge, Full-Bridge With External Interface Circuit - Available in Military Temperature Range (- 55°C to 125°C) 3 Description The UC184x A-SP family of control ICs is a pin-for-pin patible improved version of the UC184x family. Providing the necessary characteristics to control current-mode switched-mode power supplies, this device has improved features . Start-up current is specified to be less than 0.5 m A and oscillator discharge is trimmed to 8.3 m A. During UVLO, the output stage can sink at least 10 m A at less than 1.2 V for VCC over 5 V. The Device parison Table shows the difference between members of this family. Reference the individual product data sheets for ordering the radiation-improved version if available. (1) The LDR improved die is only available in the UC1843A-SP (orderable as 5962-8670409VPA). Contact factory to request an LDR-improved version of the UC1842A-SP or UC1844ASP. (2) Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad(Si)/s. Radiation lot acceptance testing is available - contact factory for details. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) UC1842A-SP UC1844A-SP CDIP (8) LCCC (20) 6.67 mm × 9.60 mm 8.89 mm × 8.89 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic VCC 7 Gnd...