Overview
The UC2846N is a dual-ended current mode PWM (Pulse Width Modulation) controller produced by Texas Instruments, although it is often associated with Unitrode due to historical context. This controller is designed to implement fixed-frequency, current-mode control schemes with a minimal external parts count. It offers superior performance in terms of improved line regulation, enhanced load response characteristics, and a simpler control loop design.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | PDIP (N) | |
| Number of Pins | 16 | |
| Oscillator Frequency | 500 kHz | |
| Output Current (Peak) | 500 mA | |
| Band Gap Reference Accuracy | ±1% | |
| Under-voltage Lockout Start-Up Threshold | 7.7 to 8.0 V | |
| Supply Current (Standby) | 17 to 21 mA |
Key Features
- Automatic Feedforward Compensation
- Programmable Pulse-by-Pulse Current Limiting
- Automatic Symmetry Correction in Push-Pull Configuration
- Enhanced Load Response Characteristics
- Parallel Operation Capability for Modular Power Systems
- Differential Current Sense Amplifier with Wide Common Mode Range
- Double-Pulse Suppression
- 500-mA (Peak) Totem-pole Outputs
- ±1% Band Gap Reference
- Under-voltage Lockout
- Soft Start Capability
- Shutdown Terminal
- Fully Latched Operation
- Deadline Adjust Capability
Applications
The UC2846N is suitable for a variety of power supply applications, including:
- Fixed-frequency, current-mode control schemes
- Push-pull converters with automatic symmetry correction
- Modular power systems requiring parallel operation
- High-performance power supplies needing enhanced load response and line regulation
- Systems requiring soft start, under-voltage lockout, and shutdown functions
Q & A
- What is the operating temperature range of the UC2846N?
The UC2846N operates within a temperature range of -40°C to 85°C.
- What is the maximum oscillator frequency of the UC2846N?
The UC2846N can operate at a maximum oscillator frequency of 500 kHz.
- What is the peak output current of the UC2846N?
The peak output current of the UC2846N is 500 mA.
- Does the UC2846N have under-voltage lockout protection?
- Can the UC2846N be used in parallel for modular power systems?
- What is the accuracy of the band gap reference in the UC2846N?
The band gap reference in the UC2846N has an accuracy of ±1%.
- Does the UC2846N have a soft start capability?
- How does the shutdown function work in the UC2846N?
The shutdown function can initiate either a complete shutdown with automatic restart or latch the supply off.
- What is the typical standby current of the UC2846N?
The typical standby current of the UC2846N is between 17 to 21 mA.
- Does the UC2846N support differential current sense amplification?
