Overview
The UC2844AD8TRG4 is a current-mode PWM controller from Texas Instruments, part of the UCx84xA family. This device is optimized for use in off-line and DC-DC converters, offering several improved features over its predecessors. It is designed to control current-mode or switched-mode power supplies with enhanced performance characteristics.
The UC2844A is a pin-for-pin compatible improved version of the UCx84x family, featuring a low start-up current of less than 0.5mA and a trimmed oscillator discharge current. The device also includes automatic feedforward compensation, pulse-by-pulse current limiting, and enhanced load response characteristics, making it a robust choice for various power supply applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | - | - | 30 | V |
| Operating Temperature Range | -40 | - | 85 | °C |
| Oscillator Frequency | 47 | 52 | 57 | kHz |
| Output Voltage (VREF) | 4.95 | 5 | 5.05 | V |
| Start-Up Current | - | - | 0.5 | mA |
| Maximum Duty Cycle | - | - | 50% | - |
| Package Type | - | - | SOIC (14) | - |
Key Features
- Optimized for Off-Line and DC-DC Converters
- Low Start-Up Current (< 0.5mA)
- Trimmed Oscillator Discharge Current
- 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
Applications
The UC2844AD8TRG4 is suitable for a variety of power supply applications, including:
- Off-line power supplies
- DC-DC converters
- Switched-mode power supplies
- High-efficiency power conversion systems
Q & A
- What is the typical start-up current of the UC2844AD8TRG4?
The start-up current is less than 0.5mA.
- What is the maximum operating temperature range for the UC2844AD8TRG4?
The operating temperature range is from -40°C to 85°C.
- What is the oscillator frequency range of the UC2844AD8TRG4?
The oscillator frequency range is from 47 kHz to 57 kHz.
- What is the maximum duty cycle for the UC2844AD8TRG4?
The maximum duty cycle is 50%.
- What type of package is the UC2844AD8TRG4 available in?
The UC2844AD8TRG4 is available in a SOIC (14) package.
- Does the UC2844AD8TRG4 have undervoltage lockout (UVLO) with hysteresis?
- What is the purpose of the automatic feedforward compensation in the UC2844AD8TRG4?
The automatic feedforward compensation helps in improving the stability and performance of the power converter.
- Can the UC2844AD8TRG4 be used in high-current applications?
- How does the UC2844AD8TRG4 handle pulse-by-pulse current limiting?
The UC2844AD8TRG4 includes pulse-by-pulse current limiting to protect the power supply from overcurrent conditions.
- Is the UC2844AD8TRG4 compatible with the WEBENCH Power Designer tool?
