Product Summary

The UC3842N is a current mode PWM controller. The UC3842N provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N Channel MOSFETs, is low in the off state.

Parametrics

UC3842N absolute maximum ratings: (1)Supply Voltage (Low Impedance Source): 30V; (2)Supply Voltage (ICC＜30mA): Self Limiting; (3)Output Current: ±1A; (4)Output Energy (Capacitive Load): 5μJ; (5)Analog Inputs: -0.3V to +6.3V; (6)Error Amp Output Sink Current: 10mA; (7)Power Dissipation at TA≤25℃(DIL.8): 1W; (8)Power Dissipation at TA≤25℃ (SOIC-14): 725mW; (9)Storage Temperature Range: -65℃ to +150℃; (10)Junction Temperature Range：-55℃ to +150℃; (11)Lead Temperature (soldering, 10 seconds): 300℃.

Features

UC3842N features: (1)Optimized For Off-line And DC To DC Converters; (2)Low Start Up Current (＜1mA); (3)Automatic Feed Forward Compensation; (4)Pulse-by-pulse Current Limiting; (5)Enhanced Load Response Characteristics; (6)Under-voltage Lockout With Hysteresis; (7)Double Pulse Suppression; (8)High Current Totem Pole Output; (9)Internally Trimmed Bandgap Reference; (10)500khz Operation; (11)Low RO Error Amp.

Diagrams

UC3842N block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
UC3842N
UC3842N
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
UC3842NG4
UC3842NG4
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