Overview
The UC3843AN2 is a high-performance current mode PWM (Pulse Width Modulation) controller produced by onsemi. It is specifically designed for off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components. This integrated circuit 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.
Key Specifications
| Parameter | Value |
|---|---|
| Clock Sync | No |
| Control Features | Frequency Control |
| Duty Cycle (Max) | 96% |
| Frequency | Up to 500kHz |
| Function | Step-Up, Step-Up/Step-Down |
| Mounting Type | Through Hole |
| Number of Outputs | 1 |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Output Configuration | Positive, Isolation Capable |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package | 8-DIP (0.300", 7.62mm) |
| Supplier Device Package | 8-PDIP |
| Synchronous Rectifier | No |
| Topology | Boost, Buck, Flyback, Forward |
| Voltage | 7.6V ~ 30V |
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
- Protective features including input and reference undervoltage lockouts, cycle-by-cycle current limiting, and programmable output deadtime
- Latch for single pulse metering
Applications
The UC3843AN2 is suitable for various off-line and DC-to-DC converter applications. It is commonly used in power supply designs that require high efficiency and reliability, such as in switching power supplies, DC-DC converters, and other power management systems. Its versatility in supporting multiple topologies (boost, buck, flyback, forward) makes it a versatile choice for a wide range of power conversion needs.
Q & A
- What is the primary function of the UC3843AN2?
The UC3843AN2 is a high-performance current mode PWM controller designed for off-line and DC-to-DC converter applications. - What is the maximum operating frequency of the UC3843AN2?
The maximum operating frequency is up to 500kHz. - What are the key protective features of the UC3843AN2?
The key protective features include input and reference undervoltage lockouts, cycle-by-cycle current limiting, and programmable output deadtime. - What is the operating temperature range of the UC3843AN2?
The operating temperature range is 0°C ~ 70°C (TA). - What are the supported topologies by the UC3843AN2?
The supported topologies include boost, buck, flyback, and forward. - What is the maximum duty cycle of the UC3843AN2?
The maximum duty cycle is 96%. - What type of output does the UC3843AN2 provide?
The output type is a transistor driver. - What is the package type of the UC3843AN2?
The package type is 8-DIP (0.300", 7.62mm). - Is the UC3843AN2 suitable for synchronous rectification?
No, it does not support synchronous rectification. - What is the voltage range for the UC3843AN2?
The voltage range is 7.6V ~ 30V.
