Overview
The UC2843BD1R2G is a high-performance fixed frequency current mode controller produced by onsemi. It is part of the UC2843B series, which is specifically designed for off-line and DC-DC converter applications. These controllers offer a cost-effective solution with minimal external components, making them ideal for a variety of power supply designs. The UC2843BD1R2G 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.
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) | - | - | - | 5.0 | μJ |
| Reference Output Voltage | Vref | 4.95 | 5.0 | 5.05 | V |
| Output Voltage Low State (ISink = 20 mA) | VOL | - | - | 0.1 | V |
| Output Voltage High State (ISource = 20 mA) | VOH | - | - | 13 | V |
| Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C) | tr | 50 | - | 150 | ns |
| Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C) | tf | 50 | - | 150 | ns |
Key Features
- Trimmed oscillator for precise duty cycle control
- Temperature-compensated reference
- High-gain error amplifier
- Current sensing comparator
- High-current totem pole output for driving power MOSFETs
- Input and reference undervoltage lockouts with hysteresis
- Cycle-by-cycle current limiting
- Programmable output deadtime
- Latch for single pulse metering
Applications
- Off-line power supplies
- DC-DC converters
- Switch-mode power supplies
- Power factor correction circuits
- Other high-performance power management systems
Q & A
- What is the UC2843BD1R2G used for?
The UC2843BD1R2G is used in off-line and DC-DC converter applications, providing a cost-effective solution with minimal external components.
- What is the maximum output current of the UC2843BD1R2G?
The maximum output current is 1.0 A.
- What is the typical reference output voltage of the UC2843BD1R2G?
The typical reference output voltage is 5.0 V.
- What protective features does the UC2843BD1R2G include?
The UC2843BD1R2G 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 maximum power supply voltage for the UC2843BD1R2G?
The maximum power supply voltage is 30 V.
- What is the typical output voltage rise and fall time of the UC2843BD1R2G?
The typical output voltage rise and fall time is between 50 ns and 150 ns.
- What is the package type of the UC2843BD1R2G?
The UC2843BD1R2G is available in an SOIC-8 package.
- What is the thermal resistance of the UC2843BD1R2G in an SOIC-8 package?
The thermal resistance, junction-to-air, for the SOIC-8 package is specified in the datasheet but generally falls within the range provided for similar packages.
- Can the UC2843BD1R2G be used in high-temperature environments?
The UC2843BD1R2G is designed to operate within a specified temperature range, but detailed thermal characteristics should be consulted from the datasheet for precise limits.
- How is the oscillator frequency programmed in the UC2843BD1R2G?
The oscillator frequency is programmed by the values chosen for the timing components RT and CT.
