Overview
The UC3844ADTR is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84x family, which is designed for off-line and DC-to-DC converter applications. This integrated circuit is optimized to operate with a minimum number of external components, making it a versatile choice for various power supply designs.
The UC3844ADTR is available in a SOIC (D) package with 14 pins and operates within a temperature range of 0°C to 70°C. It features a high-frequency operation capability of up to 500 kHz and includes several key features such as undervoltage lockout (UVLO), pulse-by-pulse current limiting, and a high-current totem-pole output stage.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage (VCC) | 30 | V |
| Output Current (IO) | ±1 | A |
| Start-Up Current (IST) | < 0.5 | mA |
| Operating Supply Current (ICC(OPR)) | 14 to 17 | mA |
| Maximum Duty Cycle (D(MAX)) | 50% | - |
| Oscillation Frequency | Up to 500 kHz | - |
| UVLO Thresholds | 16V (on), 10V (off) | - |
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
- Up to 500 kHz operation
- Error amplifier with low output resistance
Applications
The UC3844ADTR is specifically designed for use in off-line and DC-to-DC converter applications. It is suitable for a wide range of power supply designs, including:
- Off-line power supplies
- DC-to-DC converters
- Switch-mode power supplies
- High-frequency power conversion systems
Q & A
- What is the operating temperature range of the UC3844ADTR?
The UC3844ADTR operates within a temperature range of 0°C to 70°C.
- What is the maximum duty cycle of the UC3844ADTR?
The maximum duty cycle of the UC3844ADTR is 50%.
- What are the UVLO thresholds for the UC3844ADTR?
The UVLO thresholds are 16V (on) and 10V (off).
- What is the start-up current of the UC3844ADTR?
The start-up current is less than 0.5 mA.
- What is the maximum operating frequency of the UC3844ADTR?
The UC3844ADTR can operate up to 500 kHz.
- What type of output stage does the UC3844ADTR have?
The UC3844ADTR has a high-current totem-pole output stage.
- What are some key features of the UC3844ADTR?
Key features include automatic feedforward compensation, pulse-by-pulse current limiting, and enhanced load-response characteristics.
- What package type is the UC3844ADTR available in?
The UC3844ADTR is available in a SOIC (D) package with 14 pins.
- What are the typical applications of the UC3844ADTR?
Typical applications include off-line power supplies, DC-to-DC converters, and switch-mode power supplies.
- How does the UC3844ADTR handle undervoltage conditions?
The UC3844ADTR features undervoltage lockout (UVLO) with hysteresis to handle undervoltage conditions.
