Overview
The UC3843BVNG is a high-performance fixed frequency current mode controller produced by onsemi. It is part of the UC3842B and UC3843B series, designed specifically for off-line and DC-to-DC converter applications. This integrated circuit offers a cost-effective solution with minimal external components, making it ideal for various power management needs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Supply (Vcc/Vdd) | 7.6 to 30 | V |
| Frequency - Switching | Up to 500 | kHz |
| Output Current, Source or Sink | 1.0 | A |
| Output Voltage Low State (ISink = 20 mA) | 0.1 to 1.1 | V |
| Output Voltage High State (ISource = 20 mA) | 13 to 13.5 | V |
| Startup Threshold (VCC) | 8.4 | V |
| Minimum Operating Voltage After Turn-On (VCC) | 7.6 | V |
| Package Type | PDIP-8 | |
| Operating Temperature Range | -40 to +105 | °C |
Key Features
- Trimmed Oscillator for Precise Frequency Control
- Oscillator Frequency Guaranteed at 250 kHz
- Current Mode Operation 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
- Undervoltage Lockout with Hysteresis
- Low Startup and Operating Current
- Pb-Free and Halide-Free Device
Applications
The UC3843BVNG is suitable for a variety of power management applications, including off-line and DC-to-DC converters. It is particularly tailored for lower voltage applications, making it ideal for use in flyback, forward, and other switching power supply topologies.
Q & A
- What is the primary function of the UC3843BVNG?
The UC3843BVNG is a high-performance fixed frequency current mode controller designed for off-line and DC-to-DC converter applications. - What are the typical operating voltage ranges for the UC3843BVNG?
The device operates within a supply voltage range of 7.6 to 30 volts. - What is the maximum switching frequency of the UC3843BVNG?
The UC3843BVNG can operate up to a switching frequency of 500 kHz. - What type of output does the UC3843BVNG have?
The UC3843BVNG features a high current totem pole output. - Does the UC3843BVNG have undervoltage lockout protection?
Yes, the UC3843BVNG includes undervoltage lockout protection with hysteresis for both the input and reference voltages. - What is the package type for the UC3843BVNG?
The UC3843BVNG is available in a PDIP-8 package. - What are the key protective features of the UC3843BVNG?
The device includes cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. - Is the UC3843BVNG Pb-Free and Halide-Free?
Yes, the UC3843BVNG is a Pb-Free and Halide-Free device. - What is the operating temperature range for the UC3843BVNG?
The operating temperature range is from -40°C to +105°C. - What are some common applications for the UC3843BVNG?
The UC3843BVNG is commonly used in flyback, forward, and other switching power supply topologies.
