Overview
The UC2843D8G4 is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This component is part of the UCx84x family, which is designed to implement off-line or DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. The UC2843D8G4 is optimized for use in off-line and DC-to-DC converters, offering a range of features that enhance its performance and reliability.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 85 |
| Supply Voltage (Vcc) | 7.6 V to 30 V |
| Switching Frequency | Up to 500 kHz |
| Maximum Duty Cycle | Up to 100% |
| Output Current | Up to 1 A |
| Undervoltage Lockout (UVLO) | 8.4 V / 7.6 V |
| Start-up Current | < 0.5 mA |
| Output Configuration | Positive, Isolation Capable |
| Topology | Boost, Flyback, Forward Converter |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 0.5 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 UC2843D8G4 is suitable for a variety of power supply applications, including off-line power supplies and DC-to-DC converters. It is particularly useful in designs that require high efficiency, reliability, and minimal external components. The device is also qualified for use in automotive applications due to its extended temperature performance and robust features.
Q & A
- What is the operating temperature range of the UC2843D8G4?
The operating temperature range is -40°C to 85°C. - What is the maximum switching frequency of the UC2843D8G4?
The maximum switching frequency is up to 500 kHz. - What is the maximum output current of the UC2843D8G4?
The maximum output current is up to 1 A. - What are the undervoltage lockout (UVLO) thresholds for the UC2843D8G4?
The UVLO thresholds are 8.4 V and 7.6 V. - What is the start-up current of the UC2843D8G4?
The start-up current is less than 0.5 mA. - What topologies does the UC2843D8G4 support?
The UC2843D8G4 supports Boost, Flyback, and Forward Converter topologies. - Is the UC2843D8G4 qualified for automotive applications?
Yes, the UC2843D8G4 is qualified for automotive applications. - What is the package type of the UC2843D8G4?
The package type is 8-SOIC (0.154", 3.90mm Width). - Does the UC2843D8G4 have an internally trimmed bandgap reference?
Yes, it does. - What is the maximum duty cycle of the UC2843D8G4?
The maximum duty cycle is up to 100%.
