Overview
The UC2843BNG is a high-performance current mode controller produced by onsemi. This device is part of the UC2843B series, which is specifically designed for off-line and DC-DC converter applications. It offers a cost-effective solution with minimal external components, making it ideal for a variety of power management needs.
The UC2843BNG features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output. These features make it well-suited for driving power MOSFETs in various power conversion applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 7.6V to 30V | V |
| Turn On Threshold Voltage | 8.5V | V |
| Turn Off Threshold Voltage | 7.6V | V |
| Maximum Duty Cycle | 96% | % |
| Maximum Frequency | 275kHz | kHz |
| Operating Temperature Range | -25°C to +85°C | °C |
| Package Style | SOIC-8, DIP-8 | |
| Mounting Method | Surface Mount, Through-Hole | |
| Maximum Supply Current | 30mA | mA |
| Output Current (Source or Sink) | 1.0A | A |
Key Features
- Trimmed Oscillator for Precise Frequency Control: Ensures accurate and stable frequency operation.
- Oscillator Frequency Guaranteed at 250 kHz: Provides a reliable frequency range for various applications.
- Current Mode Operation to 500 kHz: Supports high-frequency current mode operation.
- Automatic Feed Forward Compensation: Enhances stability and performance in feedback loops.
- Latching PWM for Cycle-By-Cycle Current Limiting: Offers robust protection against overcurrent conditions.
- Internally Trimmed Reference with Undervoltage Lockout: Includes a stable reference voltage and undervoltage protection.
- High Current Totem Pole Output: Suitable for driving power MOSFETs efficiently.
- Undervoltage Lockout with Hysteresis: Prevents operation below safe voltage levels with hysteresis for stability.
- Low Startup and Operating Current: Minimizes power consumption during startup and operation.
- Pb-Free and Halide-Free Device: Compliant with environmental regulations.
Applications
The UC2843BNG is designed for use in off-line and DC-DC converter applications. It is particularly suitable for:
- Switch-Mode Power Supplies: Including AC-DC and DC-DC converters.
- Power Factor Correction (PFC) Circuits: Helps in achieving high power factor in power supplies.
- Motor Control and Drive Systems: Can be used in motor control circuits due to its high current handling capability.
- High-Efficiency Power Conversion Systems: Ideal for applications requiring high efficiency and reliability.
Q & A
- What is the operating voltage range of the UC2843BNG?
The UC2843BNG operates within a supply voltage range of 7.6V to 30V.
- What is the maximum frequency of operation for the UC2843BNG?
The maximum frequency of operation is 275 kHz.
- What type of package is the UC2843BNG available in?
The UC2843BNG is available in SOIC-8 and DIP-8 packages.
- What are the key protective features of the UC2843BNG?
The device includes undervoltage lockout with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime.
- Is the UC2843BNG suitable for high-frequency applications?
Yes, it supports current mode operation up to 500 kHz.
- What is the maximum output current of the UC2843BNG?
The maximum output current is 1.0 A.
- Is the UC2843BNG environmentally friendly?
Yes, it is a Pb-Free and Halide-Free device.
- What are the typical applications of the UC2843BNG?
It is used in off-line and DC-DC converter applications, including switch-mode power supplies and power factor correction circuits.
- How does the UC2843BNG handle overcurrent conditions?
The device features latching PWM for cycle-by-cycle current limiting, providing robust protection against overcurrent conditions.
- What is the operating temperature range of the UC2843BNG?
The operating temperature range is -25°C to +85°C.
