Overview
The UC2842BD1G is a high-performance fixed frequency current mode controller produced by onsemi. This integrated circuit is specifically designed for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components. It 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 ideal for driving power MOSFETs. The device 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
| Rating | Symbol | 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) | W | 5.0 | μJ |
| Reference Output Voltage (IO = 1.0 mA, TJ = 25°C) | Vref | 4.95 - 5.05 | V |
| Line Regulation (VCC = 12 V to 25 V) | Regline | -2.0 to 20 | mV |
| Load Regulation (IO = 1.0 mA to 20 mA) | Regload | -3.0 to 25 | mV |
| Temperature Stability | TS | -0.2 | mV/°C |
| Oscillator Frequency (TJ = 25°C, RT = 10 k, CT = 3.3 nF) | fOSC | 49 - 52 kHz | kHz |
| Output Voltage Low State (ISink = 20 mA) | VOL | 0.1 - 1.6 V | V |
| Output Voltage High State (ISource = 20 mA) | VOH | 12 - 13.5 V | V |
Key Features
- Trimmed oscillator for precise duty cycle control
- Temperature-compensated reference
- High-gain error amplifier with a typical DC voltage gain of 90 dB and a unity gain bandwidth of 1.0 MHz
- Current sensing comparator
- High-current totem pole output suitable for driving power MOSFETs
- Input and reference undervoltage lockouts with hysteresis
- Cycle-by-cycle current limiting and programmable output deadtime
- Latch for single pulse metering
- Low startup and operating current
- Pb-free and halide-free device
Applications
The UC2842BD1G is designed for use in off-line and DC-DC converter applications. It is particularly suitable for:
- Switch-mode power supplies
- DC-DC converters
- Off-line power supplies
- High-efficiency power conversion systems
Q & A
- What is the primary function of the UC2842BD1G?
The UC2842BD1G is a high-performance fixed frequency current mode controller designed for off-line and DC-DC converter applications.
- What are the key features of the UC2842BD1G?
Key features include a trimmed oscillator, temperature-compensated reference, high-gain error amplifier, current sensing comparator, and high-current totem pole output.
- What are the maximum bias and driver voltages for the UC2842BD1G?
The maximum bias and driver voltages are 30 V.
- What is the output current capability of the UC2842BD1G?
The output current capability is up to 1.0 A.
- What is the typical oscillator frequency of the UC2842BD1G?
The typical oscillator frequency is between 49 kHz and 52 kHz.
- What protective features does the UC2842BD1G include?
Protective features include input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime.
- What is the package type for the UC2842BD1G?
The UC2842BD1G is available in an 8-pin SOIC-8 package.
- Is the UC2842BD1G Pb-free and halide-free?
Yes, the UC2842BD1G is a Pb-free and halide-free device.
- What is the typical DC voltage gain of the error amplifier?
The typical DC voltage gain of the error amplifier is 90 dB.
- What is the unity gain bandwidth of the error amplifier?
The unity gain bandwidth of the error amplifier is 1.0 MHz.
- What are common applications for the UC2842BD1G?
