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UC2845AD8TRG4 Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2845AD8TRG4 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 45 page VIN UC2843A VCC VREF RT/CT GND COMP FB ISENSE OUTPUT Product Folder Sample & Buy Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. UC1842A, UC1843A, UC1844A, UC1845A UC2842A, UC2843A, UC2844A, UC2845A UC3842A, UC3843A, UC3844A, UC3845A SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016 UCx84xA Current-Mode PWM Controller 1 1 Features 1 • Optimized for Off-Line and DC-DC Converters • Low Start-Up Current (< 0.5 mA) • Trimmed Oscillator Discharge Current • Automatic Feedforward Compensation • 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-kHz Operation 2 Applications • Switch Mode Power Supplies (SMPS) • DC-DC Converters • Power Modules • Industrial PSU • Battery Operated PSU 3 Description The UCx84xA family of control ICs is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current- mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA 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) 6.67 mm × 9.60 mm LCCC (20) 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) 6.35 mm × 9.81 mm SOIC (8) 3.91 mm × 4.90 mm SOIC (14) 3.91 mm × 8.65 mm SOIC (16) 7.50 mm × 10.30 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Application Diagram |
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