Product Summary

The uc3844d is the fixed frequency current-mode PWM controller. It is specially designed for Off-Line and DC to DC converter applications with minimum external components. These integrated circuit of the uc3844d features a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totempole output for driving a Power MOSFET.

Parametrics

uc3844d absolute maximum ratings: (1)Supply Voltage: 30 V; (2)Output Current: ±1A; (3)Analog Inputs (Pin 2.3): -0.3 to 6.3 V; (4)Error Amp Output Sink Current: 10 mA; (5)Power Dissipation at TA≤25 ℃ (8DIP): 1200 mW; (6)Power Dissipation at TA≤25 ℃ (8SOP): 460 mW; (7)Power Dissipation at TA≤25 ℃(14SOP): 680 mW; (8)Storage Temperature Range: -65 ~ +150 ℃; (9)Lead Temperature (Soldering, 10sec): +300℃.

Features

uc3844d features:(1)Low Start up Current; (2)Maximum Duty Clamp; (3)UVLO With Hysteresis; (4)Operating Frequency up to 500KHz.

Diagrams

uc3844d internal block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC3844D
UC3844D

Texas Instruments

Current Mode PWM Controllers Crnt-Mode PWM Cntrlr

Data Sheet

0-1: $0.85
1-25: $0.76
25-100: $0.67
100-250: $0.59
UC3844D1
UC3844D1

Fairchild Semiconductor

Current Mode PWM Controllers Current Mode PWM Control IC

Data Sheet

Negotiable 
UC3844D1X
UC3844D1X

Fairchild Semiconductor

Current Mode PWM Controllers Current Mode PWM Control IC

Data Sheet

Negotiable 
UC3844D8
UC3844D8

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
UC3844D8G4
UC3844D8G4

Texas Instruments

Current Mode PWM Controllers Current-Mode PWM Controller

Data Sheet

0-1: $0.85
1-25: $0.68
25-100: $0.62
100-250: $0.55
UC3844D8TR
UC3844D8TR

Texas Instruments

Current Mode PWM Controllers Current-Mode PWM Controller

Data Sheet

0-1730: $0.33
1730-2000: $0.31
2000-2500: $0.31
2500-5000: $0.30
UC3844D8TRG4
UC3844D8TRG4

Texas Instruments

Current Mode PWM Controllers Current-Mode PWM Controller

Data Sheet

0-1730: $0.33
1730-2000: $0.31
2000-2500: $0.31
2500-5000: $0.30
UC3844DG
UC3844DG

ON Semiconductor

Other Power Management 52kHz 1A Current PWM w/48% Duty Cycle Max

Data Sheet

Negotiable