Overview
The UC2844AQD8 is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84xA family, which is an improved version of the UCx84x family. This device is optimized for use in off-line and DC-DC converters, offering several enhanced features such as low start-up current, trimmed oscillator discharge current, and automatic feedforward compensation. The UC2844AQD8 operates within a temperature range of -40°C to 125°C and is available in an 8-pin SOIC (D) package.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| VCC Voltage | 30 | V |
| Output Current (IO) | ±1 | A |
| Operating Temperature Range | -40 to 125 | °C |
| Maximum Duty Cycle | 47 to 50 | % |
| UVLO On/Off Thresholds | 16 V / 10 V | V |
| Start-Up Current | 0.3 to 0.5 | mA |
| Operating Supply Current | 11 to 17 | mA |
| Oscillator Frequency | Up to 500 kHz | - |
| Package Type | SOIC (D) 8-pin | - |
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
The UC2844AQD8 is suitable for a variety of power supply applications, including:
- Off-line power supplies
- DC-DC converters
- Switched-mode power supplies
Q & A
- What is the operating temperature range of the UC2844AQD8?
The UC2844AQD8 operates within a temperature range of -40°C to 125°C.
- What is the maximum duty cycle of the UC2844AQD8?
The maximum duty cycle of the UC2844AQD8 is less than 50%.
- What is the start-up current of the UC2844AQD8?
The start-up current of the UC2844AQD8 is less than 0.5 mA.
- What is the UVLO on/off threshold for the UC2844AQD8?
The UVLO on/off thresholds for the UC2844AQD8 are 16 V and 10 V, respectively.
- What is the package type of the UC2844AQD8?
The UC2844AQD8 is available in an 8-pin SOIC (D) package.
- What are the key features of the UC2844AQD8?
The key features include low start-up current, trimmed oscillator discharge current, automatic feedforward compensation, and more.
- What are the typical applications of the UC2844AQD8?
The UC2844AQD8 is typically used in off-line power supplies, DC-DC converters, and switched-mode power supplies.
- What is the maximum VCC voltage for the UC2844AQD8?
The maximum VCC voltage for the UC2844AQD8 is 30 V.
- What is the output current capability of the UC2844AQD8?
The output current capability of the UC2844AQD8 is ±1 A.
- Can the UC2844AQD8 operate at high frequencies?
Yes, the UC2844AQD8 can operate up to 500 kHz.
