Overview
The UC2844AD8 is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84xA family, which is optimized for off-line and DC-DC converters. This device is designed to provide robust control over switched-mode power supplies, offering several improved features over its predecessors. The UC2844AD8 is available in an 8-pin SOIC (D) package and operates over a temperature range of -40°C to 85°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 10 V ~ 30 V | V |
| Operating Temperature Range | -40°C to 85°C | °C |
| Switching Frequency | Up to 500kHz | Hz |
| Maximum Duty Cycle | 50% | % |
| Start-Up Current | < 0.5mA | mA |
| Output Current | ±1 A | A |
| Package Type | 8-SOIC (D) | - |
| UVLO (Undervoltage Lockout) | 16V (ON), 10V (OFF) | V |
| Fault Protection | Current Limiting | - |
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 UC2844AD8 is suitable for a variety of power supply applications, including:
- Off-line power supplies
- DC-DC converters
- Boost, Buck, Flyback, and Forward converters
- High-frequency switching power supplies
Q & A
- What is the operating temperature range of the UC2844AD8?
The operating temperature range is -40°C to 85°C. - What is the maximum switching frequency of the UC2844AD8?
The maximum switching frequency is up to 500kHz. - What is the start-up current of the UC2844AD8?
The start-up current is less than 0.5mA. - What type of package does the UC2844AD8 come in?
The UC2844AD8 comes in an 8-pin SOIC (D) package. - What are the UVLO thresholds for the UC2844AD8?
The UVLO thresholds are 16V (ON) and 10V (OFF). - Does the UC2844AD8 have internal switches?
No, the UC2844AD8 does not have internal switches. - What is the maximum duty cycle of the UC2844AD8?
The maximum duty cycle is 50%. - What type of fault protection does the UC2844AD8 offer?
The UC2844AD8 offers pulse-by-pulse current limiting. - Is the UC2844AD8 RoHS compliant?
Yes, the UC2844AD8 is RoHS compliant. - What are some common applications for the UC2844AD8?
Common applications include off-line power supplies, DC-DC converters, and high-frequency switching power supplies.
