Overview
The UC2844DR is a high-performance, fixed-frequency current-mode PWM controller produced by Texas Instruments. It is part of the UCx84x series, which is designed for off-line and DC-to-DC converter applications. This integrated circuit offers a cost-effective solution with minimal external components, making it ideal for a variety of power supply designs.
The UC2844DR features an internally trimmed bandgap reference, a high-gain error amplifier, and a current sensing comparator. It also includes protective features such as undervoltage lockout (UVLO) with hysteresis, cycle-by-cycle current limiting, and a totem-pole output stage suitable for driving N-channel MOSFETs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Maximum Frequency | Up to 500 kHz | - |
| Start-up Current | < 1 mA | - |
| Output Current (Source or Sink) | 1.0 A | - |
| Reference Output Voltage | 4.95 to 5.05 V | - |
| Power Dissipation @ TA = 25°C | 862 mW (D suffix), 1.25 W (N suffix) | - |
| Thermal Resistance Junction-to-Air | 145 °C/W (D suffix), 100 °C/W (N suffix) | - |
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 UC2844DR is specifically designed for off-line and DC-to-DC converter applications. It is suitable for use in a variety of power supply designs, including:
- Off-line power supplies
- DC-to-DC converters
- Switch-mode power supplies
- High-efficiency power conversion systems
Q & A
- What is the operating temperature range of the UC2844DR?
The operating temperature range is -40°C to 85°C.
- What is the maximum frequency of operation for the UC2844DR?
The UC2844DR can operate up to 500 kHz.
- What is the start-up current of the UC2844DR?
The start-up current is less than 1 mA.
- What type of output stage does the UC2844DR have?
The UC2844DR has a high-current totem-pole output stage.
- Does the UC2844DR have undervoltage lockout (UVLO) protection?
- What is the reference output voltage of the UC2844DR?
The reference output voltage is between 4.95 V and 5.05 V.
- What is the maximum output current of the UC2844DR?
The maximum output current is 1.0 A.
- What type of package is the UC2844DR available in?
The UC2844DR is available in a 14-pin SOIC (D) package.
- Does the UC2844DR have cycle-by-cycle current limiting?
- What are some common applications for the UC2844DR?
