Overview
The UC2844ADTR is a high-performance current-mode PWM controller produced by Texas Instruments. This integrated circuit is part of the UCx84xA family, which is optimized for off-line and DC-to-DC converter applications. It offers a range of features that make it suitable for implementing fixed-frequency current-mode control schemes with a minimal number of external components.
The device is designed to operate over a wide temperature range of -40°C to 85°C and is available in a 14-pin SOIC (D) package. It features a low start-up current of less than 0.5mA, making it energy-efficient and suitable for various power supply designs.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOIC (D) - 14 pins |
| Operating Temperature Range (°C) | -40 to 85 |
| Start-Up Current | < 0.5mA |
| Maximum Operating Frequency | Up to 500kHz |
| Undervoltage Lockout (UVLO) Thresholds | 16V (on), 10V (off) |
| Maximum Duty Cycle | Up to 50% |
| Output Stage | High-current totem pole output |
| Reference Voltage | Internally trimmed bandgap reference |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 0.5mA)
- 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 500kHz operation
- Error amplifier with low output resistance
- Trimmed oscillator for precise frequency control
- Latching PWM for cycle-by-cycle current limiting
Applications
The UC2844ADTR is designed for use in various power supply applications, including:
- Off-line power supplies
- DC-to-DC converters
- Switched-mode power supplies
- High-frequency power conversion systems
Q & A
- What is the operating temperature range of the UC2844ADTR?
The UC2844ADTR operates over a temperature range of -40°C to 85°C.
- What is the start-up current of the UC2844ADTR?
The start-up current is less than 0.5mA.
- What is the maximum operating frequency of the UC2844ADTR?
The device can operate up to 500kHz.
- What are the undervoltage lockout (UVLO) thresholds for the UC2844ADTR?
The UVLO thresholds are 16V (on) and 10V (off).
- What type of output stage does the UC2844ADTR have?
The output stage is a high-current totem pole output.
- Is the UC2844ADTR suitable for driving N-channel MOSFETs?
- What is the purpose of the internally trimmed bandgap reference in the UC2844ADTR?
The internally trimmed bandgap reference provides a precise voltage reference for the error amplifier input.
- Does the UC2844ADTR have pulse-by-pulse current limiting?
- What is the package type and pin count of the UC2844ADTR?
The device is packaged in a 14-pin SOIC (D) package.
- Is the UC2844ADTR optimized for off-line and DC-to-DC converters?
