TL2844

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TL2842, TL2843, TL2844, TL2845 TL3842, TL3843, TL3844, TL3845 SLVS038I – JANUARY 1989 – REVISED JULY 2016 TLx84x Current-Mode PWM Controllers 1 Features 1 Optimized for Off-Line and DC-to-DC Converters Low Start-Up Current (< 1 mA) Automatic Feed-forward 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 500-kHz Operation Error Amplifier With Low Output Resistance Designed to be Interchangeable with UC2842 and UC3842 Series 2 Applications Switching regulators of any polarity Transformer-coupled DC/DC convertors Device Pinout Drawing SOIC (14) 3 Description The TL284x and TL384x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak curr...