Overview
The UC2844N/81291 is a single-ended current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This integrated circuit is designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. It is part of the UCx84x family, which offers various package options, temperature ranges, and duty cycle configurations. The UC2844N is specifically optimized for operation from -40°C to 85°C, making it suitable for a wide range of power supply applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-PDIP (0.300", 7.62mm) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 85 |
| Switching Frequency | Up to 500kHz |
| Supply Voltage (Vcc/Vdd) | 10 V ~ 30 V |
| Duty Cycle | 48% |
| Start-Up Voltage | 16V |
| Topology | Boost, Flyback, Forward |
| Fault Protection | Current Limiting |
| Mounting Type | Through Hole |
| Output Type | Transistor Driver |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1mA)
- 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
- Error amplifier with low output resistance
Applications
The UC2844N is widely used in various power supply applications, including:
- Off-line power supplies
- DC-to-DC converters
- Boost, flyback, and forward converters
- High-frequency switching power supplies
Q & A
- What is the operating temperature range of the UC2844N?
The UC2844N operates from -40°C to 85°C.
- What is the maximum switching frequency of the UC2844N?
The UC2844N can operate up to 500kHz.
- What is the supply voltage range for the UC2844N?
The supply voltage range is from 10 V to 30 V.
- What type of fault protection does the UC2844N offer?
The UC2844N offers pulse-by-pulse current limiting and undervoltage lockout with hysteresis.
- What is the package type of the UC2844N?
The UC2844N is available in an 8-PDIP (0.300", 7.62mm) package.
- What are the typical applications of the UC2844N?
The UC2844N is used in off-line power supplies, DC-to-DC converters, and high-frequency switching power supplies.
- Does the UC2844N have an internally trimmed bandgap reference?
Yes, the UC2844N has an internally trimmed bandgap reference.
- What is the duty cycle of the UC2844N?
The duty cycle of the UC2844N is 48%.
- Does the UC2844N support double-pulse suppression?
Yes, the UC2844N supports double-pulse suppression.
- What type of output stage does the UC2844N have?
The UC2844N has a high-current totem-pole output stage.
