Overview
The UC3843BVD1R2 is a high-performance fixed frequency current mode controller from onsemi. It is part of the UC3842B and UC3843B series, which are specifically designed for off-line and DC-DC converter applications. These controllers offer a cost-effective solution with minimal external components, making them ideal for a variety of power management needs.
The UC3843B series is tailored for lower voltage applications, featuring undervoltage lockout (UVLO) thresholds of 8.5 V (on) and 7.6 V (off). This makes them suitable for a range of applications where precise control and reliability are crucial.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 7.6 to 30 | V |
| Turn On Threshold Voltage | 8.5 | V |
| Turn Off Threshold Voltage | 7.6 | V |
| Maximum Duty Cycle | 96% | % |
| Maximum Frequency | 275 kHz | kHz |
| Operating Temperature Range | -40°C to +105°C | °C |
| Package Style | SOIC-8 | |
| Mounting Method | Surface Mount | |
| Maximum Supply Current | 17 mA | 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
The UC3843BVD1R2 is designed for off-line and DC-DC converter applications. It is particularly useful in power supply designs where high performance, reliability, and minimal external components are required. These controllers are suitable for a wide range of applications, including:
- Off-line power supplies
- DC-DC converters
- Power MOSFET drivers
- High-efficiency power management systems
Q & A
- What is the primary function of the UC3843BVD1R2?
The UC3843BVD1R2 is a high-performance fixed frequency current mode controller designed for off-line and DC-DC converter applications.
- What are the UVLO thresholds for the UC3843B series?
The UVLO thresholds for the UC3843B series are 8.5 V (on) and 7.6 V (off).
- What is the maximum operating frequency of the UC3843BVD1R2?
The maximum operating frequency is 275 kHz.
- What type of package is the UC3843BVD1R2 available in?
The UC3843BVD1R2 is available in an 8-pin surface mount (SOIC-8) package.
- What are some key features of the UC3843BVD1R2?
Key features include a trimmed oscillator, current mode operation to 500 kHz, automatic feed forward compensation, latching PWM, and a high current totem pole output.
- Is the UC3843BVD1R2 Pb-Free and Halide-Free?
Yes, the UC3843BVD1R2 is a Pb-Free and Halide-Free device.
- What is the operating temperature range of the UC3843BVD1R2?
The operating temperature range is -40°C to +105°C.
- What protective features does the UC3843BVD1R2 include?
The device includes input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
- How is the oscillator frequency controlled in the UC3843BVD1R2?
The oscillator frequency is controlled by the values chosen for the timing components RT and CT.
- What type of error amplifier does the UC3843BVD1R2 feature?
The device features a fully compensated error amplifier with access to the inverting input and output.
