Overview
The UC3843ANG is a high-performance, fixed frequency, current mode controller produced by Onsemi. It is specifically designed for Off-Line and DC-DC converter applications, offering a cost-effective solution with minimal external components. This controller is part of the UC3843 series, known for its versatility and reliability in power management solutions.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | 30 | V | ||
| Output Current | IO | ±1 A | A | ||
| Reference Output Voltage | Vref | 4.95 | 5.0 | 5.05 | V |
| Line Regulation | Regline | 20 mV | mV | ||
| Load Regulation | Regload | 25 mV | mV | ||
| Temperature Stability | TS | 0.2 mV/°C | mV/°C | ||
| Output Voltage Low State | VOL | 0.1 | 1.1 | V | |
| Output Voltage High State | VOH | 12.9 | 13.5 | V | |
| Output Voltage Rise Time | tr | 50 | 150 | ns | |
| Output Voltage Fall Time | tf | 50 | 150 | ns | |
| Startup Threshold (VCC) | 8.5 | V | |||
| UVLO Off Threshold (VCC) | 7.9 | V |
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 a power MOSFET
- Input and reference undervoltage lockouts with hysteresis
- Cycle-by-cycle current limiting
- Programmable output deadtime
- Latch for single pulse metering
- Low startup current
- Maximum duty clamp
- Operating frequency up to 500 kHz
Applications
- Off-Line and DC-DC converter applications
- Boost, flyback, and forward converters
- Power management solutions in various electronic devices
- High-efficiency switching power supplies
- Industrial and consumer power conversion systems
Q & A
- What is the UC3843ANG used for?
The UC3843ANG is used for Off-Line and DC-DC converter applications, providing a cost-effective solution with minimal external components.
- What are the key features of the UC3843ANG?
Key features include a trimmed oscillator, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem pole output.
- What are the maximum ratings for the UC3843ANG?
The maximum supply voltage is 30 V, and the maximum output current is ±1 A.
- What is the reference output voltage of the UC3843ANG?
The reference output voltage is typically 5.0 V, with a range of 4.95 V to 5.05 V.
- What is the operating frequency range of the UC3843ANG?
The operating frequency can be programmed up to 500 kHz.
- What are the UVLO thresholds for the UC3843ANG?
The UVLO thresholds are 8.5 V (on) and 7.9 V (off).
- What protective features does the UC3843ANG have?
Protective features include input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime.
- What are the common applications of the UC3843ANG?
Common applications include boost, flyback, and forward converters, as well as high-efficiency switching power supplies and industrial power conversion systems.
- What are the package options for the UC3843ANG?
The UC3843ANG is available in various packages, including 8-pin DIP, 8-pin SOIC, and 14-pin SOIC.
- What is the temperature range for the UC3843ANG?
The operating temperature range is typically from 0°C to 70°C.
