Overview
The UC3842AN1 is a high-performance, fixed-frequency, current-mode PWM (Pulse Width Modulation) controller produced by ON Semiconductor. This IC is specifically designed for off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components. It is part of the UC3842A series, which includes various package options such as 8-pin, 14-pin, and 16-pin configurations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage | 12 to 28 | V |
| Output Pin Current | 200 | mA |
| Switching Frequency | Up to 500 kHz | |
| Duty Cycle | Up to 100% | |
| Operating Supply Current | 25 mA (typical) | mA |
| Reference Output Voltage | 5.0 V (typical) | V |
| Line Regulation | -2.0 to 20 mV | mV |
| Load Regulation | -3.0 to 25 mV | mV |
| Temperature Stability | -0.2 mV/°C | mV/°C |
| Operating Junction Temperature | -25 to +85 °C | °C |
| Storage Temperature Range | -65 to +150 °C | °C |
Key Features
- Trimmed Oscillator Discharge Current for precise duty cycle control
- Current Mode Operation up to 500 kHz
- Automatic Feed Forward Compensation
- Latching PWM for cycle-by-cycle current limiting
- Internally Trimmed Reference with Undervoltage Lockout
- 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
Applications
- Switch Mode Power Supplies (SMPS)
- DC-DC converter circuits
- Electronic power supplies
- Battery drain circuits
- Load machines and other power management systems
Q & A
- What is the UC3842AN1 used for? The UC3842AN1 is used for off-line and DC-to-DC converter applications, providing PWM signals for controlling power switches based on current feedback.
- What are the operating voltage ranges for the UC3842AN1? The operating voltage range is from 12V to 28V.
- What is the maximum output current of the UC3842AN1? The maximum output current is 200 mA.
- What is the switching frequency range of the UC3842AN1? The switching frequency can go up to 500 kHz.
- Does the UC3842AN1 have built-in protection features? Yes, it includes protective features such as undervoltage lockouts, cycle-by-cycle current limiting, and programmable output deadtime.
- What type of output does the UC3842AN1 have? It has a high current totem pole output suitable for driving power MOSFETs.
- How is the oscillator frequency programmed in the UC3842AN1? The oscillator frequency is programmed using external timing components RT and CT.
- What is the reference output voltage of the UC3842AN1? The reference output voltage is typically 5.0 V.
- What are some common applications of the UC3842AN1? Common applications include SMPS, DC-DC converters, electronic power supplies, and battery drain circuits.
- What are the package options available for the UC3842AN1? It is available in 8-pin, 14-pin, and other package configurations.
