Overview
The UC3843BVD is a high-performance, fixed-frequency, current-mode PWM controller designed by onsemi. It is specifically tailored for a wide range of power conversion applications, including off-line and DC-DC converter systems. This controller offers a cost-effective solution with minimal external components, making it an ideal choice for designers seeking efficient and reliable power management solutions.
The UC3843BVD features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output suitable for driving power MOSFETs. It also includes protective features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
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 |
| Compensation (Vcomp) | -0.3 to +7.2 | V |
| Output Voltage (Vo) | -0.3 to VCC or VC + 0.3 | V |
| Error Amp Output Sink Current (IO) | 10 | mA |
| Operating Temperature Range | -40°C to 105°C | °C |
| UVLO Thresholds | 8.5 V (on), 7.6 V (off) | V |
| Switching Frequency | Up to 500 kHz | kHz |
| Maximum Duty Cycle | 96% | % |
| Package Type | SOIC-14 |
Key Features
- Fixed-frequency current-mode PWM control
- Trimmed oscillator for precise duty cycle control
- Temperature-compensated reference
- High-gain error amplifier
- Current sensing comparator
- High-current totem pole output
- Undervoltage lockout with hysteresis
- Cycle-by-cycle current limiting
- Programmable output deadtime
- Latch for single pulse metering
- Automatic feed forward compensation
- Low startup and operating current
- Pb-Free and Halide-Free device
Applications
- Offline power supplies
- Battery chargers
- Telecom and industrial power systems
- Uninterruptible power supplies (UPS)
- Distributed power systems
Q & A
- What is the UC3843BVD used for?
The UC3843BVD is used for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components.
- What are the UVLO thresholds for the UC3843BVD?
The UVLO thresholds for the UC3843BVD are 8.5 V (on) and 7.6 V (off).
- What is the maximum switching frequency of the UC3843BVD?
The maximum switching frequency of the UC3843BVD is up to 500 kHz.
- What type of package is the UC3843BVD available in?
The UC3843BVD is available in a 14-pin surface mount (SOIC-14) package.
- What are the protective features of the UC3843BVD?
The protective features include 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 operating temperature range of the UC3843BVD?
The operating temperature range of the UC3843BVD is -40°C to 105°C.
- Is the UC3843BVD Pb-Free and Halide-Free?
Yes, the UC3843BVD is a Pb-Free and Halide-Free device.
- What are the typical applications of the UC3843BVD?
The typical applications include offline power supplies, battery chargers, telecom and industrial power systems, uninterruptible power supplies (UPS), and distributed power systems.
- What is the maximum duty cycle of the UC3843BVD?
The maximum duty cycle of the UC3843BVD is 96%.
- Is the UC3843BVD still in production?
No, the UC3843BVD is an obsolete product and is no longer manufactured by onsemi.
