Overview
The UC3844AD8TR is a current-mode PWM (Pulse Width Modulation) controller manufactured 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 off-line and DC-DC converters, offering several enhanced features to control current-mode or switched-mode power supplies efficiently.
The UC3844AD8TR is packaged in an 8-pin SOIC (D) package and operates within a temperature range of 0°C to 70°C. It is designed to provide low start-up current, trimmed oscillator discharge current, and automatic feedforward compensation, among other features.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Maximum Duty Cycle | Up to 50% | - |
| Oscillator Frequency | 100 kHz to 500 kHz | - |
| Start-Up Current | < 0.5 mA | - |
| Output Drive Current | ±1 A | - |
| VCC Voltage Range | Up to 30 V | - |
| Reference Voltage | 5 V | - |
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
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
- Off-line power supplies
- DC-DC fixed-frequency current-mode control schemes
Q & A
- What is the operating temperature range of the UC3844AD8TR?
The UC3844AD8TR operates within a temperature range of 0°C to 70°C.
- What is the maximum duty cycle of the UC3844AD8TR?
The maximum duty cycle of the UC3844AD8TR is up to 50%.
- What is the oscillator frequency range of the UC3844AD8TR?
The oscillator frequency range is from 100 kHz to 500 kHz.
- What is the start-up current of the UC3844AD8TR?
The start-up current is less than 0.5 mA.
- What type of output stage does the UC3844AD8TR have?
The UC3844AD8TR has a high-current totem pole output stage.
- What is the reference voltage of the UC3844AD8TR?
The reference voltage is 5 V.
- What are some common applications of the UC3844AD8TR?
Common applications include switching regulators, transformer-coupled DC-DC converters, off-line power supplies, and DC-DC fixed-frequency current-mode control schemes.
- What package type is the UC3844AD8TR available in?
The UC3844AD8TR is available in an 8-pin SOIC (D) package.
- Does the UC3844AD8TR have undervoltage lockout (UVLO) with hysteresis?
- Can the UC3844AD8TR be used for both off-line and DC-DC converters?
