Overview
The UC3843BVDR2 is a high-performance, fixed-frequency, current-mode PWM controller produced by onsemi. This device is part of the UC3843B 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 wide range of power conversion needs. The UC3843BVDR2 features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, and a high-current totem pole output suited for driving power MOSFETs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 7.6V to 30V | V |
| Turn On Threshold Voltage | 16V | V |
| Turn Off Threshold Voltage | 10V | V |
| Maximum Duty Cycle | 96% | % |
| Maximum Frequency | 275kHz | kHz |
| Operating Temperature Range | -40°C to +105°C | °C |
| Package Style | SOIC-8 | |
| Mounting Method | Surface Mount | |
| Maximum Supply Current | 17mA | mA |
| Output Current (Source or Sink) | ±1A | A |
| Error Amp Output Sink Current | 10mA | mA |
Key Features
- Trimmed Oscillator for Precise Frequency Control
- Oscillator Frequency Guaranteed at 250 kHz
- Current Mode Operation to 500 kHz
- Automatic Feed Forward Compensation
- Latching PWM for Cycle-by-Cycle Current Limiting
- Internally Trimmed Reference with Undervoltage Lockout
- High Current Totem Pole Output
- Undervoltage Lockout with Hysteresis
- Low Startup and Operating Current
- Pb-Free and Halide-Free Device
Applications
- Off-line power supplies
- Battery chargers
- Telecom and industrial power systems
- Uninterruptible power supplies (UPS)
- Distributed power systems
Q & A
- What is the UC3843BVDR2 used for?
The UC3843BVDR2 is used for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components.
- What is the supply voltage range of the UC3843BVDR2?
The supply voltage range is from 7.6V to 30V.
- What is the maximum frequency of the UC3843BVDR2?
The maximum frequency is 275 kHz.
- What are the key features of the UC3843BVDR2?
Key features include a trimmed oscillator, current mode operation, automatic feed forward compensation, latching PWM, and undervoltage lockout with hysteresis.
- What are the typical applications of the UC3843BVDR2?
Typical applications include off-line power supplies, battery chargers, telecom and industrial power systems, UPS, and distributed power systems.
- What is the operating temperature range of the UC3843BVDR2?
The operating temperature range is from -40°C to +105°C.
- What is the package style of the UC3843BVDR2?
The package style is SOIC-8.
- Is the UC3843BVDR2 Pb-Free and Halide-Free?
- What is the maximum output current of the UC3843BVDR2?
The maximum output current is ±1A.
- What protective features does the UC3843BVDR2 have?
The device includes protective features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime.
