(China (Mainland))
Product Summary
The UC3843BN is a high performance fixed frequency current mode controller. It is specifically designed for Off-Line and DC-DC converter applications offering the designer a cost-effective solution with minimal external components. The UC3843BN features a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. The features of UC3843BN included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle by cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
Parametrics
UC3843BN absolute maximum ratings: (1)Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec), VCC, VC: 30V; (2)Total Power Supply and Zener Current (ICC + IZ): 30mA; (3)Output Current, Source or Sink, IO: 1.0A; (4)Output Energy (Capacitive Load per Cycle), W: 5.0μJ; (5)Current Sense and Voltage Feedback Inputs, Vin: -0.3 to +5.5V; (6)Error Amp Output Sink Current, IO: 10mA; (7)Maximum Power Dissipation @ TA = 25℃, PD: 862mW
Features
UC3843BN features: (1)Trimmed Oscillator for Precise Frequency Control; (2)Oscillator Frequency Guaranteed at 250 kHz; (3)Current Mode Operation to 500 kHz; (4)Automatic Feed Forward Compensation; (5)Latching PWM for Cycle By Cycle Current Limiting; (6)Internally Trimmed Reference with Undervoltage Lockout; (7)High Current Totem Pole Output; (8)Undervoltage Lockout with Hysteresis; (9)Low Startup and Operating Current; (10)Pb Free Packages are Available.
Diagrams
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 UC3843BN |
STMicroelectronics |
Current Mode PWM Controllers 0.5mA Current Mode |
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UC3843BNG |
ON Semiconductor |
Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max |
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