Overview
The UC3843BVD1R2G is a high-performance current mode controller produced by onsemi. This integrated circuit 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 variety of power management needs.
The device 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 suitable for driving power MOSFETs. Additionally, it includes protective features such as input and reference undervoltage lockouts, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Current - Max | 17 | mA |
| Supply Voltage | 7.6 to 30 | V |
| Turn On Threshold Voltage | 16 | V |
| Turn Off Threshold Voltage | 10 | V |
| Duty Cycle - Max | 96% | % |
| Frequency - Max | 275 kHz | kHz |
| Operating Temperature Range | -40°C to +105°C | °C |
| Package Style | SOIC-8 | |
| Mounting Method | Surface Mount |
Key Features
- Trimmed Oscillator for Precise Frequency Control: Ensures accurate duty cycle control.
- Oscillator Frequency Guaranteed at 250 kHz: Reliable operation at specified frequencies.
- Current Mode Operation to 500 kHz: Supports high-frequency applications.
- Automatic Feed Forward Compensation: Enhances stability and performance.
- Latching PWM for Cycle-by-Cycle Current Limiting: Provides robust current protection.
- Internally Trimmed Reference with Undervoltage Lockout: Ensures stable reference voltage and protects against undervoltage conditions.
- High Current Totem Pole Output: Suitable for driving power MOSFETs.
- Undervoltage Lockout with Hysteresis: Protects the device from voltage fluctuations.
- Low Startup and Operating Current: Efficient power consumption.
- Pb-Free and Halide-Free Device: Compliant with environmental regulations.
Applications
The UC3843BVD1R2G is designed for various power management applications, including:
- Off-Line Converters: Suitable for applications requiring high performance and reliability in off-line power conversion.
- DC-DC Converters: Ideal for DC-DC conversion applications where precise control and high efficiency are necessary.
- Power Supplies: Used in the design of power supplies that require robust current mode control and protective features.
Q & A
- What is the primary function of the UC3843BVD1R2G?
The UC3843BVD1R2G is a high-performance current mode controller designed for off-line and DC-DC converter applications.
- What is the supply voltage range for the UC3843BVD1R2G?
The supply voltage range is from 7.6V to 30V.
- What is the maximum duty cycle of the UC3843BVD1R2G?
The maximum duty cycle is 96%.
- What is the maximum operating frequency of the UC3843BVD1R2G?
The maximum operating frequency is 275 kHz.
- What type of package is the UC3843BVD1R2G available in?
The device is available in an 8-pin SOIC-8 surface mount package.
- What protective features does the UC3843BVD1R2G include?
The device includes input and reference undervoltage lockouts, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
- Is the UC3843BVD1R2G Pb-Free and Halide-Free?
Yes, the UC3843BVD1R2G is Pb-Free and Halide-Free.
- What is the operating temperature range of the UC3843BVD1R2G?
The operating temperature range is from -40°C to +105°C.
- How is the oscillator frequency programmed in the UC3843BVD1R2G?
The oscillator frequency is programmed by the values chosen for the timing components RT and CT.
- What are some common applications of the UC3843BVD1R2G?
Common applications include off-line converters, DC-DC converters, and power supplies.
