UC3843AD (#43363) |
Product Status
Obsolete |
Overview
The UC3843AD controller provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulseby-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET's, and an externally programmable oscillator to set frequency and maximum duty cycle. The undervoltage lock-out is designed to operate with 250?A typ. start-up current, allowing an efficient bootstrap supply voltage design. The UC3843AD has 8.4V startup voltage and 0.8V hiseresys, operating at any duty cycle up to 100%. The UC3843AD has a 14-pin SOIC package which makes the Power Output Stage Collector and Ground pins available.
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Package Carrier: | Tube |
Electrical Rating | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Duty Cycle % | Duty Cycle (%) | 100 | % | ||
Switching Frequency (kHz) | fs | 1000 | kHz |
Environmental Rating | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Operating Temperature | TA | 70 | °C |
Maximum Electrical Rating | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Supply Voltage | VCC | 30 | V |
Undefined | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Regulated Outputs | OutR | 1 | Select |
Resources
Datasheets | |
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uc184xa Datasheet |
App Notes | |
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TN-206:Voltage-Mode, Current-Mode (and Hysteretic Control) |
Reliability | |
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Quality & Reliability Report - Aliso Viejo, CA, USA - Garden Grove, CA, USA - San Jose, CA, USA |
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