TL3843

电流模式 PWM 控制器

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.

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Optimized for Off-Line and DC-to-DC Converters

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Low Start-Up Current < 1 mA

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Automatic Feed-forward compensation

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Pulse-by-Pulse Current Limiting

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Enhanced Load-Response Characteristics

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Undervoltage Lockout With Hysteresis

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Double-Pulse Suppression

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High-Current Totem-Pole Output

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Internally Trimmed Bandgap Reference

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500-kHz Operation

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Error Amplifier With Low Output Resistance

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Designed to be Interchangeable with UC2842 and

UC3842 Series