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 
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 
UC3844DR2
UC3844DR2
ON Semiconductor
Other Power Management 52kHz 1A Current PWM
Data Sheet
Negotiable