Overview
The UC3842ADR2 from onsemi is a high-performance fixed frequency current mode controller, specifically designed for off-line and DC-DC converter applications. It offers a cost-effective solution with minimal external components, making it an ideal choice for designers seeking efficient and reliable power management solutions.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Reference Output Voltage | Vref | 4.95 | 5.0 | 5.05 | V |
| Line Regulation (VCC = 12 V to 25 V) | Regline | -2.0 | - | 20 | mV |
| Load Regulation (IO = 1.0 mA to 20 mA) | Regload | -3.0 | - | 25 | mV |
| Temperature Stability | TS | -0.2 | - | - | mV/°C |
| Oscillator Frequency (TJ = 25°C) | fosc | 47 | 50 | 52 | kHz |
| Output Current, Source or Sink | IO | - | - | 1.0 | A |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature | TA | 0 | - | 70 | °C |
Key Features
- Trimmed Oscillator Discharge Current for Precise Duty Cycle Control: Ensures accurate and stable oscillator frequency.
- Current Mode Operation to 500 kHz: Supports high-frequency applications.
- Automatic Feed Forward Compensation: Enhances stability and performance of the power supply.
- Latching PWM for Cycle-By-Cycle Current Limiting: Provides robust current limiting and protection.
- Internally Trimmed Reference with Undervoltage Lockout: Offers reliable voltage reference and protection against undervoltage conditions.
- High Current Totem Pole Output: Capable of sourcing and sinking high currents, ideal for driving power MOSFETs.
- Undervoltage Lockout with Hysteresis: Prevents the device from operating under low voltage conditions.
- Low Startup and Operating Current: Minimizes power consumption.
- Direct Interface with ON Semiconductor SENSEFET™ Products: Compatible with SENSEFET™ devices for enhanced performance.
- Pb-Free Packages Available: Environmentally friendly packaging options.
Applications
The UC3842ADR2 is designed for use in off-line and DC-DC converter applications. It is particularly suited for:
- Switch-mode power supplies
- DC-DC converters
- Power factor correction circuits
- High-frequency power conversion systems
Q & A
- What is the primary function of the UC3842ADR2?
The UC3842ADR2 is a high-performance fixed frequency current mode controller designed for off-line and DC-DC converter applications. - What is the maximum oscillator frequency supported by the UC3842ADR2?
The UC3842ADR2 can operate up to 500 kHz. - What type of output does the UC3842ADR2 have?
The UC3842ADR2 has a high current totem pole output. - What is the purpose of the undervoltage lockout feature?
The undervoltage lockout feature prevents the device from operating under low voltage conditions, ensuring reliable operation. - What is the operating junction temperature range for the UC3842ADR2?
The operating junction temperature range is from 0°C to 150°C. - Can the UC3842ADR2 be used in high-frequency applications?
Yes, it supports current mode operation up to 500 kHz. - What type of packages are available for the UC3842ADR2?
The device is available in 8-pin dual-in-line and 14-pin surface mount (SOIC-14) packages. - Does the UC3842ADR2 have built-in current limiting features?
Yes, it includes cycle-by-cycle current limiting and a latch for single pulse metering. - Is the UC3842ADR2 compatible with SENSEFET™ products?
Yes, it has a direct interface with ON Semiconductor SENSEFET™ products. - What is the maximum output current of the UC3842ADR2?
The maximum output current is 1.0 A.
