UC3842AN AC-DC Controllers and Regulators IC - DIP-8 Package

UC3842AN AC-DC Controller and Regulator IC - DIP-8 Package is a fixed-frequency current-mode PWM controller designed for high-performance AC-DC and DC-DC power supply applications. It features an integrated precision reference, oscillator, error amplifier, current sensing comparator, and high-current totem-pole output, making it ideal for switch-mode power supplies (SMPS), offline converters, battery chargers, and industrial power systems. The UC3842AN offers low startup current, fast transient response, and cycle-by-cycle current limiting for reliable and efficient operation.

Features:

1. Fixed Frequency Current-Mode PWM Controller
2. Low Startup Current
3. High Current Totem-Pole Output
4. Integrated Precision 5V Reference
5. Internal Oscillator
6. Cycle-by-Cycle Current Limiting
7. Under-Voltage Lockout (UVLO)
8. Fast Transient Response
9. High Stability Operation
10. Suitable for AC-DC and DC-DC Converters
11. DIP-8 Through-Hole Package
12. RoHS Compliant

Specifications:

Parameter	Value
Product Type	AC-DC Controller and Regulator IC
Model	UC3842AN
Package	DIP-8
Control Method	Current-Mode PWM
Supply Voltage (VCC)	10V to 30V
Startup Voltage	16V (Typical)
UVLO Turn-Off Voltage	10V (Typical)
Reference Output Voltage	5V ±1%
Oscillator Frequency	Up to 500kHz
Output Driver Peak Current	±1A
Duty Cycle	Up to 100%
Operating Temperature	0°C to +70°C
Mounting Type	Through Hole
Applications	SMPS, AC-DC Converters, DC-DC Converters, Battery Chargers, LED Drivers, Industrial Power Supplies
RoHS Compliance	Yes

Pin Configuration:

Pin	Function
1	COMP (Compensation)
2	VFB (Voltage Feedback)
3	ISENSE (Current Sense)
4	RT/CT (Oscillator Timing)
5	GND
6	OUTPUT (Gate Drive Output)
7	VCC
8	VREF (5V Reference Output)

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Package Includes:

1 x UC3842AN AC-DC Controller and Regulator IC - DIP-8 Package