Overview
The UC3843ADR2G is a high-performance fixed frequency current mode PWM 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. It 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 a power MOSFET. 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) | 17 mA | |
| Supply Voltage | 7.6 V to 30 V | |
| Turn On Threshold Voltage | 7.8 V to 9.0 V | |
| Turn Off Threshold Voltage | 7.0 V to 8.2 V | |
| Duty Cycle (Max) | 96% | |
| Frequency (Max) | 275 kHz | |
| Operating Temperature Range | 0°C to 70°C | |
| Package Style | SOIC-8 | |
| Mounting Method | Surface Mount | |
| Reference Output Voltage | 4.90 V to 5.10 V | |
| Oscillation Frequency | 47 kHz to 57 kHz | |
| Output Current (Source or Sink) | ±1 A |
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
- Automatic feed-forward compensation
- Low startup and operating current
- Direct interface with ON Semiconductor SENSEFET™ products
- Pb-free packages available
Applications
The UC3843ADR2G is specifically designed for off-line and DC-DC converter applications. It is suitable for use in various power supply designs, including switch-mode power supplies, DC-DC converters, and other high-performance power management systems. Its features make it an ideal choice for applications requiring precise duty cycle control, high current drive capability, and robust protective features.
Q & A
- What is the primary function of the UC3843ADR2G?
The UC3843ADR2G is a high-performance fixed frequency current mode PWM controller designed for off-line and DC-DC converter applications.
- What is the supply voltage range for the UC3843ADR2G?
The supply voltage range is from 7.6 V to 30 V.
- What is the maximum duty cycle of the UC3843ADR2G?
The maximum duty cycle is 96%.
- What is the maximum operating frequency of the UC3843ADR2G?
The maximum operating frequency is 275 kHz.
- What type of package is the UC3843ADR2G available in?
The UC3843ADR2G is available in an 8-pin SOIC (Surface Mount) package.
- What protective features does the UC3843ADR2G 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.
- What is the reference output voltage of the UC3843ADR2G?
The reference output voltage is between 4.90 V and 5.10 V.
- Can the UC3843ADR2G be used in high-temperature environments?
The operating temperature range is from 0°C to 70°C.
- Is the UC3843ADR2G RoHS compliant?
Yes, the UC3843ADR2G is RoHS compliant.
- What is the maximum output current of the UC3843ADR2G?
The maximum output current is ±1 A.
