Product Summary

The UC3842AN high performance fixed frequency current mode controller is specifically designed for off-line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components. The UC3842AN 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. Also 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

UC3842AN 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: 5.0 uJ; (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: Maximum Power Dissipation @ TA = 25℃: PD=862 mW; Thermal Resistance, Junction.to.Air: RθJA=145℃/W; N Suffix, Plastic Package: maximum Power Dissipation @ TA = 25℃: PD=1.25 W; Thermal Resistance, Junction.to.Air: RθJA=100℃/W; (8)Operating Junction Temperature, TJ: + 150 ℃; (9)Operating Ambient Temperature, TA: 0 to + 70℃; (10)Storage Temperature Range, Tstg: -65 to + 150 ℃.

Features

UC3842AN features: (1)Trimmed Oscillator Discharge Current for Precise Duty Cycle Control; (2)Current Mode Operation to 500 kHz; (3)Automatic Feed Forward Compensation; (4)Latching PWM for Cycle-By-Cycle Current Limiting; (5)Internally Trimmed Reference with Undervoltage Lockout; (6)High Current Totem Pole Output; (7)Undervoltage Lockout with Hysteresis; (8)Low Startup and Operating Current; (9)Direct Interface with ON Semiconductor SENSEFET Products; (10)Pb-Free Packages are Available.

Diagrams

UC3842AN Simplified Block Diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC3842AN
UC3842AN

Texas Instruments

Current Mode PWM Controllers Current Mode

Data Sheet

0-1: $0.85
1-25: $0.76
25-100: $0.67
100-250: $0.59
UC3842AN2
UC3842AN2

ON Semiconductor

Other Power Management 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC3842AN2G
UC3842AN2G

ON Semiconductor

Other Power Management 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

Negotiable 
UC3842ANG
UC3842ANG

ON Semiconductor

Other Power Management 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

Negotiable 
UC3842ANG4
UC3842ANG4

Texas Instruments

Current Mode PWM Controllers Current-Mode PWM Controller

Data Sheet

0-1: $0.85
1-25: $0.76
25-100: $0.67
100-250: $0.59