Overview
The UC2843BDG is a high-performance, fixed-frequency current mode controller produced by onsemi. This device is part of the UC2842B and UC3842B series, which are specifically designed for off-line and DC-DC converter applications. The UC2843BDG offers a cost-effective solution with minimal external components, making it an ideal choice for designers seeking efficient and reliable power management.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | 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) | W | - | - | 5.0 | μJ |
| Reference Output Voltage (IO = 1.0 mA, TJ = 25°C) | Vref | 4.95 | 5.0 | 5.05 | V |
| Line Regulation (VCC = 12 V to 25 V) | Regline | - | - | 2.0 | mV |
| Load Regulation (IO = 1.0 mA to 20 mA) | Regload | - | - | 3.0 | mV |
| Temperature Stability | TS | - | - | 0.2 | mV/°C |
| Startup Threshold (VCC) | Vth | 7.8 | - | 9.0 | V |
| Minimum Operating Voltage After Turn-On (VCC) | VCC(min) | 7.0 | - | 8.2 | V |
Key Features
- Trimmed Oscillator for Precise Frequency Control: The oscillator frequency is programmable using the 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 control loop.
- Latching PWM for Cycle-By-Cycle Current Limiting: Provides robust protection against overcurrent conditions.
- Internally Trimmed Reference with Undervoltage Lockout: Features a stable reference voltage with undervoltage lockout for reliable operation.
- High Current Totem Pole Output: Capable of driving power MOSFETs with high current output.
- Undervoltage Lockout with Hysteresis: Prevents the device from operating below the minimum voltage threshold, ensuring safe startup and operation.
- Low Startup and Operating Current: Minimizes power consumption during startup and operation.
- Pb-Free and Halide-Free: Compliant with environmental regulations, making it a sustainable choice.
Applications
- Off-Line Converters: Suitable for designing off-line power supplies due to its robust protection features and high performance.
- DC-DC Converters: Ideal for DC-DC converter applications requiring precise control and high efficiency.
- Power Management Systems: Can be used in various power management systems where reliable and efficient power conversion is critical.
Q & A
- What is the typical reference output voltage of the UC2843BDG?
The typical reference output voltage is 5.0 V.
- What is the maximum output current of the UC2843BDG?
The maximum output current is 1.0 A.
- What is the startup threshold voltage for the UC2843BDG?
The startup threshold voltage is between 7.8 V and 9.0 V.
- What is the minimum operating voltage after turn-on for the UC2843BDG?
The minimum operating voltage after turn-on is between 7.0 V and 8.2 V.
- What is the oscillator frequency range for the UC2843BDG?
The oscillator frequency can be programmed up to 500 kHz using the RT and CT components.
- Does the UC2843BDG have undervoltage lockout protection?
Yes, it features undervoltage lockout with hysteresis to ensure safe startup and operation.
- What is the power dissipation at 25°C for the SOIC-14 package?
The maximum power dissipation at 25°C for the SOIC-14 package is specified in the datasheet, but generally, it is dependent on the thermal resistance of the package.
- Is the UC2843BDG Pb-Free and Halide-Free?
Yes, the UC2843BDG is Pb-Free and Halide-Free, making it compliant with environmental regulations.
- What are the typical applications of the UC2843BDG?
The UC2843BDG is typically used in off-line converters, DC-DC converters, and other power management systems requiring precise control and high efficiency.
- What package types are available for the UC2843BDG?
The UC2843BDG is available in SOIC-14 and SOIC-8 packages.
