UC2842BNG

Product Summary

The UC2844BNG is a high performance fixed frequency current mode controller. The device is specifically designed for Off-Line and dc-dc converter applications offering the designer a cost-effective solution with minimal external components. The UC2844BNG features an oscillator, 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 UC2844BNG also included are protective features consisting of input and reference under voltage lockouts each with hysteresis, cycle-by-cycle current limiting, a latch for single pulse metering.

Parametrics

UC2842BNG absolute maximum ratings: (1)Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec), VCC, VC: 30 V; (2)Total Power Supply and Zener Current, (ICC + IZ): 30 mA; (3)Output Current, Source or Sink, IO: 1.0 A; (4)Output Energy (Capacitive Load per Cycle), W: 5.0μJ; (5)Current Sense and Voltage Feedback Inputs, Vin: -0.3 to + 5.5 V; (6)Error Amp Output Sink Current, IO: 10 mA; (7)Power Dissipation and Thermal Characteristics, D Suffix, Plastic Package, SOIC-14 Case 751A, Maximum Power Dissipation @ TA = 25℃, Thermal Resistance, Junction-to-Air, PD: 862mW, RθJA: 145℃/W; D1 Suffix, Plastic Package, SOIC-8 Case 751, Maximum Power Dissipation @ TA = 25℃, Thermal Resistance, Junction-to-Air, PD: 702mW, RθJA: 178℃/W; N Suffix, Plastic Package, Case 626, Maximum Power Dissipation @ TA = 25℃, Thermal Resistance, Junction-to-Air, PD: 1.25W, RθJA: 100℃/W; (8)Operating Junction Temperature, TJ: +150℃; (9)Operating Ambient Temperature, TA: -25 to +85℃; (10)Storage Temperature Range, Tstg: -65 to +150℃.

Features

UC2842BNG 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