UC2845A Datasheet | Texas Instruments

Features - Optimized for Off-Line and DC-DC Converters - Low Start-Up Current (< 0.5 m A) - Trimmed Oscillator Discharge Current - Automatic Feedforward pensation - Pulse-by-Pulse Current Limiting - Enhanced Load Response Characteristics - Undervoltage Lockout With Hysteresis - Double Pulse Suppression - High-Current Totem Pole Output - Internally-Trimmed Bandgap Reference - Up to 500-k Hz Operation - Create a Custom Design Using the UCx84x A With the WEBENCH® Power Designer 2 Applications - Switch Mode Power Supplies (SMPS) - DC-DC Converters - Power Modules - Industrial PSU - Battery Operated PSU 3 Description The UCx84x A family of control devices is a pin-for-pin patible improved version of the UCx84x family. Providing the necessary features to control currentmode or switched-mode power supplies, this family of devices has many improved features : startup current is less than 0.5 m A, oscillator discharge is trimmed to 8.3 m A, and during UVLO, the output stage can sink at least 10 m A at less than 1.2 V for VCC over 5 V. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) UC1842A, UC1843A, UC1844A, UC1845A CDIP (8) LCCC (20) 6.67 mm × 9.60 mm 8.89 mm × 8.89 mm UC2843A PLCC (20) 8.96 mm × 8.96 mm UC2842A, UC2843A, UC2844A, UC2845A, UC3842A, UC3843A, UC3844A, UC3845A PDIP (8) SOIC (8) SOIC (14) SOIC (16) 6.35 mm × 9.81 mm 3.91 mm × 4.90 mm 3.91 mm × 8.65 mm 7.50 mm × 10.30 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. DEVICE UC1842A UC1843A UC1844A UC1845A Device parison Table UVLO ON UVLO OFF MAX DUTY...