TL2845电流模式 PWM 控制器

　　描述

　　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 current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

　　特性

　　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

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