Overview
The UC2843BD1R2 is a high-performance fixed frequency current mode controller produced by onsemi. This integrated circuit is specifically designed for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components. The UC2843B series 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 ideal for driving power MOSFETs. The device includes protective features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Current - Max | 30 | mA |
| Supply Voltage | 7.6 to 30 | V |
| Turn On Threshold Voltage | 8.5 | V |
| Turn Off Threshold Voltage | 7.6 | V |
| Duty Cycle - Max | 96% | % |
| Frequency - Max | 275 | kHz |
| Operating Temperature Range | -25 to +85 | °C |
| Package Style | SOIC-8 | |
| Mounting Method | Surface Mount |
Key Features
- Trimmed oscillator for precise duty cycle control
- Temperature-compensated reference
- High-gain error amplifier
- Current sensing comparator
- High-current totem pole output for driving power MOSFETs
- Input and reference undervoltage lockouts with hysteresis
- Cycle-by-cycle current limiting
- Programmable output deadtime
- Latch for single pulse metering
Applications
The UC2843BD1R2 is suitable for various power management applications, including:
- Off-line converters
- DC-DC converters
- Power supplies requiring high efficiency and reliability
- Industrial and consumer electronics where precise control over power conversion is necessary
Q & A
- What is the maximum supply voltage for the UC2843BD1R2?
The maximum supply voltage is 30 V.
- What is the operating temperature range of the UC2843BD1R2?
The operating temperature range is -25°C to +85°C.
- What is the maximum duty cycle of the UC2843BD1R2?
The maximum duty cycle is 96%.
- What type of package does the UC2843BD1R2 come in?
The UC2843BD1R2 comes in an SOIC-8 package.
- What are the key protective features of the UC2843BD1R2?
The key protective features include input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime.
- What is the purpose of the trimmed oscillator in the UC2843BD1R2?
The trimmed oscillator is used for precise duty cycle control.
- Can the UC2843BD1R2 be used in high-temperature environments?
Yes, it can operate up to 85°C.
- What is the maximum frequency of the UC2843BD1R2?
The maximum frequency is 275 kHz.
- Is the UC2843BD1R2 suitable for surface mount assembly?
Yes, it is designed for surface mount assembly.
- What are some common applications of the UC2843BD1R2?
Common applications include off-line converters, DC-DC converters, and power supplies in industrial and consumer electronics.
