Overview
The UC2844AD8G4 is a current-mode PWM controller from Texas Instruments, part of the UCx84xA family. This device is optimized for 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 UC2844AD8G4 is pin-for-pin compatible with the UCx84x family and features a low start-up current of less than 0.5 mA, trimmed oscillator discharge current, and automatic feedforward compensation. It also includes pulse-by-pulse current limiting, enhanced load response characteristics, and undervoltage lockout with hysteresis.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (8) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage (VCC) | Up to 30 | V |
| Oscillator Frequency | Up to 500 kHz | - |
| UVLO Start Threshold | 15 to 17 | V |
| UVLO Minimum Operation Voltage After Turn-On | 9 to 11 | V |
| Maximum Duty Cycle | < 50% | - |
| Output Current | ±1 A | - |
| Power Dissipation at TA ≤ 25°C | 1 W | - |
Key Features
- Optimized for Off-Line and DC-DC Converters
- Low Start-Up Current (< 0.5 mA)
- 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 500 kHz Operation
Applications
- Switch Mode Power Supplies (SMPS)
- DC-DC Converters
- Power Modules
- Industrial Power Supplies (PSU)
- Battery Operated Power Supplies (PSU)
Q & A
- What is the UC2844AD8G4 optimized for?
The UC2844AD8G4 is optimized for off-line and DC-DC converters.
- What is the start-up current of the UC2844AD8G4?
The start-up current is less than 0.5 mA.
- What is the oscillator frequency range of the UC2844AD8G4?
The oscillator frequency can operate up to 500 kHz.
- What is the UVLO start threshold for the UC2844AD8G4?
The UVLO start threshold is between 15 to 17 V.
- What is the maximum duty cycle of the UC2844AD8G4?
The maximum duty cycle is less than 50%.
- What are the key features of the UC2844AD8G4?
Key features include low start-up current, trimmed oscillator discharge current, automatic feedforward compensation, pulse-by-pulse current limiting, and more.
- What are the typical applications of the UC2844AD8G4?
Typical applications include switch mode power supplies, DC-DC converters, power modules, industrial power supplies, and battery operated power supplies.
- What is the operating temperature range of the UC2844AD8G4?
The operating temperature range is -40 to 85°C.
- What is the package type of the UC2844AD8G4?
The package type is SOIC (8).
- How can I design a custom application using the UC2844AD8G4?
You can use the WEBENCH Power Designer to create a custom design with the UCx84xA family.
