Overview
The UC3842ADX is a fixed PWM (Pulse Width Modulation) controller manufactured by Fairchild Semiconductor, now part of ON Semiconductor. This component is designed for offline and DC-DC converter applications, offering a range of features that make it suitable for various power management needs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 29 | V |
| Operating Temperature | 0 to +70 | °C |
| Output Current | High Current Totem-pole Output | - |
| Start-up Current | 0.2 mA (typ) | mA |
| UVLO Thresholds | 16V (on), 10V (off) | V |
| Operating Frequency Range | Up to 500 kHz | kHz |
| Package Type | SOIC-8, DIP-8 | - |
Key Features
- Low start-up current of 0.2 mA (typ)
- Under Voltage Lock Out (UVLO) with hysteresis
- High gain error amplifier
- Current sensing comparator
- High current totem-pole output for driving a POWER MOSFET
- Cycle-by-cycle current limiting
- Short shutdown delay time (typ. 100 ns)
- Output swing limiting up to 22V
- Temperature compensated reference
Applications
The UC3842ADX is suitable for a variety of power management applications, including offline and DC-DC converters. It is particularly useful in designs requiring high efficiency, reliability, and robust control over the power conversion process.
Q & A
- What is the primary function of the UC3842ADX?
The UC3842ADX is a fixed PWM controller designed for offline and DC-DC converter applications. - Who is the manufacturer of the UC3842ADX?
The UC3842ADX is manufactured by Fairchild Semiconductor, now part of ON Semiconductor. - What is the typical start-up current of the UC3842ADX?
The typical start-up current is 0.2 mA. - What are the UVLO thresholds for the UC3842ADX?
The UVLO thresholds are 16V (on) and 10V (off). - What is the maximum operating frequency of the UC3842ADX?
The UC3842ADX can operate up to 500 kHz. - What types of packages are available for the UC3842ADX?
The UC3842ADX is available in SOIC-8 and DIP-8 packages. - Does the UC3842ADX support cycle-by-cycle current limiting?
Yes, it supports cycle-by-cycle current limiting. - What is the typical shutdown delay time of the UC3842ADX?
The typical shutdown delay time is 100 ns. - Can the UC3842ADX operate at 100% duty cycle?
Yes, it can operate within 100% duty cycle. - What are some key features of the UC3842ADX?
Key features include low start-up current, UVLO with hysteresis, high gain error amplifier, current sensing comparator, and high current totem-pole output.
