Overview
The UC2844AQD8R is a current-mode PWM controller produced by Texas Instruments. It is part of the UCx84xA family, which is a pin-for-pin compatible improved version of the UCx84x family. This device is optimized for controlling current-mode or switched-mode power supplies, offering several enhanced features over its predecessors.
The UC2844AQD8R is particularly suited for off-line and DC-DC converters, providing low startup current, trimmed oscillator discharge current, and automatic feedforward compensation. It operates up to 500 kHz and features a high-current totem pole output, making it versatile for various power supply applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOIC (D) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 125 |
| Maximum Operating Voltage | 30 V |
| Maximum Output Current | 1 A |
| Switching Frequency | Up to 500 kHz |
| Undervoltage Lockout (UVLO) | 16 V / 10 V with hysteresis |
| Startup Current | < 0.5 mA |
| Oscillator Discharge Current | Trimmed to 8.3 mA |
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
- Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer
Applications
The UC2844AQD8R is designed for use in various power supply applications, including:
- Off-Line Power Supplies
- DC-DC Converters
- Flyback Regulators
- Forward Converters
- Other Switched-Mode Power Supplies
It is particularly useful in scenarios requiring high efficiency, low startup current, and robust current limiting features.
Q & A
- What is the maximum operating voltage of the UC2844AQD8R?
The maximum operating voltage of the UC2844AQD8R is 30 V.
- What is the maximum switching frequency of the UC2844AQD8R?
The UC2844AQD8R can operate up to 500 kHz.
- What is the startup current of the UC2844AQD8R?
The startup current of the UC2844AQD8R is less than 0.5 mA.
- What type of package does the UC2844AQD8R come in?
The UC2844AQD8R comes in an SOIC (D) package with 8 pins.
- What is the operating temperature range of the UC2844AQD8R?
The operating temperature range of the UC2844AQD8R is -40°C to 125°C.
- Does the UC2844AQD8R have undervoltage lockout (UVLO) features?
Yes, the UC2844AQD8R has UVLO with hysteresis at 16 V / 10 V.
- What are some of the key applications for the UC2844AQD8R?
The UC2844AQD8R is used in off-line power supplies, DC-DC converters, flyback regulators, and other switched-mode power supplies.
- Does the UC2844AQD8R support pulse-by-pulse current limiting?
Yes, the UC2844AQD8R supports pulse-by-pulse current limiting.
- Can the UC2844AQD8R be used with the WEBENCH Power Designer?
Yes, the UC2844AQD8R can be used to create custom designs with the WEBENCH Power Designer.
- What is the maximum output current of the UC2844AQD8R?
The maximum output current of the UC2844AQD8R is 1 A.
