Overview
The UC3843BN is a high-performance current mode PWM (Pulse Width Modulation) controller produced by STMicroelectronics. This integrated circuit is specifically designed for off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components. The UC3843BN is part of the UC384xB family, known for its fixed frequency current mode control schemes, making it ideal for various power supply and converter designs.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Part Number | UC3843BN |
| Type of Integrated Circuit | PWM Controller |
| Number of Channels | 1 |
| Control Mode | Current Mode |
| Supply Voltage Range | 7.6 V to 36 V |
| Switching Frequency Range | 48 kHz to 500 kHz |
| Output Current | 1 A |
| Package Type | MiniDIP8 |
| Mounting Type | THT (Through-Hole Technology) |
| Operating Temperature Range | -25°C to 85°C |
| Duty Cycle Range | 0% to 96% |
| Topology | Boost, Flyback |
Key Features
- High Performance Current Mode Control: The UC3843BN features a trimmed oscillator for precise duty cycle control and a temperature-compensated reference voltage.
- Current Sensing and Limiting: Includes a high gain error amplifier, current sensing comparator, and cycle-by-cycle current limiting.
- Protective Features: Equipped with input and reference undervoltage lockouts, programmable output deadtime, and a latch for single pulse metering.
- High Current Output: A high current totem pole output is ideal for driving power MOSFETs.
- Minimal External Components: Designed to operate with minimal external components, making it a cost-effective solution.
Applications
- Off-Line and DC-to-DC Converters: Suitable for various power supply and converter applications, including off-line and DC-to-DC converters.
- Boost and Flyback Converters: Can be used in boost and flyback converter topologies.
- Power Supply Designs: Ideal for designing power supplies that require high performance and reliability.
Q & A
- What is the UC3843BN used for?
The UC3843BN is used for off-line and DC-to-DC converter applications, providing high-performance current mode PWM control.
- What is the operating voltage range of the UC3843BN?
The UC3843BN operates within a supply voltage range of 7.6 V to 36 V.
- What is the switching frequency range of the UC3843BN?
The switching frequency range of the UC3843BN is from 48 kHz to 500 kHz.
- What is the maximum output current of the UC3843BN?
The maximum output current of the UC3843BN is 1 A.
- What package type is the UC3843BN available in?
The UC3843BN is available in a MiniDIP8 package.
- What is the operating temperature range of the UC3843BN?
The operating temperature range of the UC3843BN is from -25°C to 85°C.
- Does the UC3843BN have protective features?
Yes, the UC3843BN includes protective features such as input and reference undervoltage lockouts, cycle-by-cycle current limiting, and programmable output deadtime.
- What topologies can the UC3843BN be used in?
The UC3843BN can be used in boost and flyback converter topologies.
- Is the UC3843BN RoHS compliant?
Yes, the UC3843BN is RoHS compliant.
- What is the duty cycle range of the UC3843BN?
The duty cycle range of the UC3843BN is from 0% to 96%.
