Product Summary

The UC3843BNG 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. This UC3843BNG feature 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 feature of UC3843BNG 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

UC3843BNG 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

UC3843BNG 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

UC3843BNG Simplified Block Diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC3843BNG
UC3843BNG

ON Semiconductor

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

Data Sheet

0-1: $0.33
1-25: $0.29
25-100: $0.22
100-500: $0.19
Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC3803X
UC3803X

Other


Data Sheet

Negotiable 
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UC3823

Other


Data Sheet

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UC3823A

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Data Sheet

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UC3823ADW
UC3823ADW

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1: $8.53
1-25: $8.15
25-100: $6.13
100-250: $6.00
UC3823ADWG4
UC3823ADWG4

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1: $8.53
1-25: $7.50
25-100: $6.13
100-250: $6.00
UC3823ADWTR
UC3823ADWTR

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1539: $4.76
1539-2000: $4.61