Overview
The UC3842BVD1G is a high-performance current mode PWM (Pulse Width Modulation) controller produced by onsemi. This component is specifically designed for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components. Introduced on November 17, 1997, it has been a reliable choice for power management in various electronic systems. The UC3842BVD1G is available in an 8-pin SOIC (Small Outline Integrated Circuit) package and is Pb-free and halide-free, complying with EU RoHS regulations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bias and Driver Voltages (VCC, VC) | 30 | V |
| Total Power Supply and Zener Current (ICC + IZ) | 30 | mA |
| Output Current, Source or Sink (IO) | 1.0 | A |
| Output Energy (Capacitive Load per Cycle) | 5.0 | mJ |
| Current Sense, Voltage Feedback, Vref and Rt/Ct Inputs (Vin) | -0.3 to +5.5 | V |
| Oscillator Frequency | Up to 500 kHz | kHz |
| Minimum Operating Supply Voltage | 10 V (UVLO on), 6 V (startup threshold) | V |
| Maximum Operating Supply Voltage | 30 V | V |
| Maximum Duty Cycle | Determined by RT value | % |
| Maximum Power Dissipation @ TA = 25°C | Dependent on package type | mW |
| Operating Temperature Range | -40°C to +105°C (depending on package) | °C |
Key Features
- Trimmed Oscillator for Precise Frequency Control: The oscillator frequency is programmable using external timing components RT and CT, ensuring precise duty cycle control.
- Current Mode Operation: Supports operation up to 500 kHz, making it suitable for high-frequency applications.
- Automatic Feed Forward Compensation: Enhances stability and performance in the feedback loop.
- Latching PWM for Cycle-by-Cycle Current Limiting: Provides robust current limiting and protection against overcurrent conditions.
- Internally Trimmed Reference with Undervoltage Lockout: Features a temperature-compensated reference and undervoltage lockout with hysteresis for reliable operation.
- High Current Totem Pole Output: Ideal for driving power MOSFETs with high current capabilities.
- Low Startup and Operating Current: Minimizes power consumption during startup and operation.
- Pb-Free and Halide-Free: Compliant with EU RoHS regulations, ensuring environmental sustainability.
Applications
The UC3842BVD1G is designed for use in off-line and DC-DC converter applications. It is particularly suitable for:
- Switch-Mode Power Supplies: Including flyback, forward, and half-bridge converters.
- DC-DC Converters: For both isolated and non-isolated configurations.
- Power Management Systems: In various electronic devices requiring efficient and reliable power conversion.
Q & A
- What is the primary function of the UC3842BVD1G?
The UC3842BVD1G is a high-performance current mode PWM controller designed for off-line and DC-DC converter applications.
- What is the maximum operating frequency of the UC3842BVD1G?
The UC3842BVD1G can operate up to 500 kHz.
- What type of package is the UC3842BVD1G available in?
The UC3842BVD1G is available in an 8-pin SOIC package.
- What are the key protective features of the UC3842BVD1G?
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 typical quiescent current of the UC3842BVD1G?
The typical quiescent current is low, contributing to minimal power consumption during operation.
- Is the UC3842BVD1G compliant with environmental regulations?
Yes, it is Pb-free and halide-free, complying with EU RoHS regulations.
- What is the maximum output current of the UC3842BVD1G?
The maximum output current is 1.0 A.
- How is the oscillator frequency programmed in the UC3842BVD1G?
The oscillator frequency is programmed using external timing components RT and CT.
- What is the operating temperature range of the UC3842BVD1G?
The operating temperature range is -40°C to +105°C, depending on the package type.
- What type of output does the UC3842BVD1G have?
The UC3842BVD1G features a high current totem pole output, ideal for driving power MOSFETs.
