DC-DC Controller UC3843 SMD IC
EGP 10
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Description The UCx84xA family of control devices 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 V CC over 5 V. Parameters Topology : Boost, Buck, Flyback, Forward Duty cycle (Max) (%) : 100 Vin (Max) (V) : 28 UVLO thresholds on/off (V) : 8.4/7.6 Features : Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology Operating temperature range (C) : 0 to 70 Switching frequency (Max) (kHz) : 500 Rating : Catalog Gate drive (Typ) (A) : 1 Features: 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 Applications Switch Mode Power Supplies (SMPS) DC-DC Converters Power Modules Industrial PSU Battery Operated PSU Datasheet
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