Overview
The UC2843NG4 is a current-mode PWM controller integrated circuit produced by Texas Instruments. This component is part of the UCx84x series, which is designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. The UC2843NG4 is specifically tailored for operation in a temperature range of –40°C to 85°C, making it suitable for a variety of power supply applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency | 100 kHz to 500 kHz | kHz |
| Input Voltage Range | 12 V to 28 V | V |
| Package Type | PDIP-8 | |
| Junction Temperature | –40°C to 85°C | °C |
| Start-up Current | < 1 mA | mA |
| Output Drive Current | ±1 A | A |
| Reference Voltage | 5 V ± 0.05 V | V |
| ESD Rating | Up to 2 kV | kV |
| Thermal Resistance (Junction-to-Ambient) | 53.7 °C/W | °C/W |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1 mA)
- Automatic feedforward compensation
- Pulse-by-pulse current limiting
- Enhanced load-response characteristics
- Undervoltage lockout with hysteresis
- Double-pulse suppression
- High-current totem-pole output
- Internally trimmed bandgap reference
- Error amplifier with low output resistance
Applications
The UC2843NG4 is suitable for various power supply applications, including:
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
- Off-line power supplies
- DC-DC converters requiring high efficiency and reliability
Q & A
- What is the operating frequency range of the UC2843NG4?
The UC2843NG4 operates within a frequency range of 100 kHz to 500 kHz. - What is the input voltage range for the UC2843NG4?
The input voltage range is 12 V to 28 V. - What type of package does the UC2843NG4 come in?
The UC2843NG4 comes in a PDIP-8 package. - What is the temperature range for the UC2843NG4?
The UC2843NG4 operates in a temperature range of –40°C to 85°C. - What is the start-up current of the UC2843NG4?
The start-up current is less than 1 mA. - What are the key features of the UC2843NG4?
Key features include low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, and an internally trimmed bandgap reference. - What are the typical applications of the UC2843NG4?
Typical applications include switching regulators, transformer-coupled DC-DC converters, and off-line power supplies. - How does the UC2843NG4 handle undervoltage conditions?
The UC2843NG4 features undervoltage lockout with hysteresis to handle undervoltage conditions. - What is the output drive capability of the UC2843NG4?
The output can drive up to ±1 A. - Is the UC2843NG4 suitable for high-current applications?
Yes, it features a high-current totem-pole output stage suitable for driving N-channel MOSFETs.
