Overview
The UC2843DG4 is a current-mode PWM (Pulse Width Modulation) controller from Texas Instruments, designed to optimize off-line and DC-to-DC converters. This integrated circuit is part of the UCx84x family, which provides the necessary features for implementing fixed-frequency current-mode control schemes with a minimal number of external components. The UC2843DG4 is particularly suited for applications requiring high performance and reliability in power conversion.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage) | 12 | - | 25 | V |
| Operating Temperature | -40 | - | 85 | °C |
| Start-Up Current | - | 1 | - | mA |
| Oscillator Frequency | 100 | - | 500 | kHz |
| Reference Voltage | 4.95 | 5 | 5.05 | V |
| Output Drive Current | - | - | ±1 | A |
| Error Amplifier Output Sink Current | - | - | 10 | mA |
| Junction Temperature | - | - | 150 | °C |
Key Features
- Low start-up current (< 1 mA)
- Automatic feedforward compensation
- Pulse-by-pulse current limiting
- Enhanced load-response characteristics
- Under-voltage lockout with hysteresis
- Double pulse suppression
- High-current totem pole output
- Internally trimmed bandgap reference
- Up to 500-kHz operation
- Error amplifier with low output resistance
Applications
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
- Switch mode power supplies (SMPS)
- DC-DC converters
- Power modules
- Industrial power supplies (PSU)
- Battery-operated power supplies (PSU)
Q & A
- What is the operating temperature range of the UC2843DG4?
The UC2843DG4 operates from -40°C to 85°C.
- What is the typical start-up current of the UC2843DG4?
The start-up current is less than 1 mA.
- What is the maximum oscillator frequency of the UC2843DG4?
The oscillator frequency can go up to 500 kHz.
- What is the reference voltage of the UC2843DG4?
The reference voltage is typically 5 V, with a range of 4.95 V to 5.05 V.
- What are the key features of the UC2843DG4?
The key features include low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, enhanced load-response characteristics, under-voltage lockout with hysteresis, double pulse suppression, high-current totem pole output, and an internally trimmed bandgap reference).
- What types of applications is the UC2843DG4 suited for?
The UC2843DG4 is suited for switching regulators, transformer-coupled DC-DC converters, switch mode power supplies (SMPS), DC-DC converters, power modules, industrial power supplies, and battery-operated power supplies).
- What is the maximum output drive current of the UC2843DG4?
The output drive current can be up to ±1 A).
- What is the error amplifier output sink current of the UC2843DG4?
The error amplifier output sink current is up to 10 mA).
- What is the junction temperature limit of the UC2843DG4?
The junction temperature should not exceed 150°C).
- What is the package type of the UC2843DG4?
The UC2843DG4 is available in SOIC (14-pin) packages).
