Product Summary

The UC2843BD is a High Performance 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 UC2843BD 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 UC2843BD is available in an 8-pin dual-in-line and surface mount (SOIC-8) plastic package as well as the 14-pin plastic surface mount (SOIC-14).

Parametrics

UC2843BD 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: 5.0 μJ; (5)Current Sense and Voltage Feedback Inputs Vin: -0.3 to + 5.5 V; (6)Error Amp Output Sink Current IO: 10 mA; (7)Operating Junction Temperature TJ: +150 ℃; (8)Operating Ambient Temperature: -25 to + 85 ℃; (9)Storage Temperature Range Tstg: -65 to +150 ℃.

Features

UC2843BD 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

UC2843BD diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC2843BD
UC2843BD

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC2843BD1013TR
UC2843BD1013TR

STMicroelectronics

Current Mode PWM Controllers 0.5mA Current Mode

Data Sheet

0-1950: $0.24
UC2843BD1G
UC2843BD1G

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

0-1: $0.36
1-25: $0.32
25-100: $0.24
100-500: $0.21
UC2843BD1R2
UC2843BD1R2

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC2843BD1R2G
UC2843BD1R2G

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

0-1: $0.36
1-25: $0.32
25-100: $0.24
100-500: $0.21
UC2843BDG
UC2843BDG

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

0-1: $0.36
1-25: $0.32
25-100: $0.24
100-500: $0.21
UC2843BDR2
UC2843BDR2

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC2843BDR2G
UC2843BDR2G

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

0-1: $0.36
1-25: $0.32
25-100: $0.24
100-500: $0.21