UC2843D8TR Current-Mode PWM Controller with 500kHz Operation 8.4V/7.9V UVLO 50mA Totem-Pole Output Internal Trimmed Bandgap Low Start-Up and Operating

UC2843D8TR Current-Mode PWM Controller with 500kHz Operation 8.4V/7.9V UVLO 50mA Totem-Pole Output Internal Trimmed Bandgap Low Start-Up andamp; Operating Current in SOIC-8

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Features

andbull; Optimized for off-line and DC-to-DC converters

andbull; Low start-up current (andlt; 1mA)

andbull; Automatic feedforward compensation

andbull; Pulse-by-pulse current limiting

andbull; Enhanced load-response characteristics

andbull; Undervoltage lockout with hysteresis

andbull; Double-pulse suppression

andbull; High-current totem-pole output

andbull; Internally trimmed bandgap reference

andbull; Up to 500kHz operation

andbull; Error amplifier with low output resistance

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Applications

andbull; Switching regulators of any polarity

andbull; Transformer-coupled DC-DC converters

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Description

The UCx84x 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. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed for DC-DC applications. The UC184x devices are specified for operation from andndash;55anddeg;C to 125anddeg;C, the UC284x series is specified for operation from andndash;40anddeg;C to 85anddeg;C, and the UC384x series is specified for operation from 0anddeg;C to 70anddeg;C.

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INFORMATION

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Drawing

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UC2843D8TR PWM controller 500kHz

current-mode PWM controller SOIC-8

PWM controller with UVLO 8.4V

UC2843D8TR Current-Mode PWM Controller with 500kHz Operation 8.4V/7.9V UVLO 50mA Totem-Pole Output Internal Trimmed Bandgap Low Start-Up and Operating Images