Overview
The UC2842BD is a high-performance current mode PWM 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 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 | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | - | - | 30 | V |
| Output Current (Source or Sink) | IO | - | - | 1.0 | A |
| Output Energy (Capacitive Load per Cycle) | EO | - | - | 5.0 | μJ |
| Reference Output Voltage | Vref | 4.95 | 5.0 | 5.05 | V |
| Line Regulation | Regline | - | 2.0 | 20 | mV |
| Load Regulation | Regload | - | 3.0 | 25 | mV |
| Temperature Stability | TS | - | 0.2 | - | mV/°C |
| Oscillator Frequency | fOSC | 48 | 52 | 56 | kHz |
| UVLO Start Threshold | - | 16 | - | - | V |
| UVLO Stop Threshold | - | 10 | - | - | V |
Key Features
- Trimmed oscillator for precise duty cycle control
- Temperature-compensated reference with undervoltage lockout
- High-gain error amplifier
- Current sensing comparator
- High-current totem pole output for driving power MOSFETs
- Cycle-by-cycle current limiting and programmable output deadtime
- Latch for single pulse metering
- Low startup and operating current
- Pb-free packages available
Applications
The UC2842BD is ideally suited for various power conversion applications, including:
- Off-line converters
- DC-DC converters
- Power supplies for industrial and consumer electronics
- Telecom and networking equipment
- Automotive systems requiring robust and efficient power management
Q & A
- What is the primary function of the UC2842BD?
The UC2842BD is a high-performance current mode PWM controller designed for off-line and DC-DC converter applications.
- What is the typical oscillator frequency of the UC2842BD?
The oscillator frequency is typically around 52 kHz.
- What are the UVLO thresholds for the UC2842BD?
The UVLO start threshold is 16 V, and the stop threshold is 10 V.
- What is the maximum output current of the UC2842BD?
The maximum output current is 1.0 A.
- What type of output does the UC2842BD have?
The UC2842BD has a high-current totem pole output.
- Does the UC2842BD have protective features?
Yes, it includes features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime.
- What is the temperature range for the UC2842BD?
The junction operating temperature range is -40°C to 150°C.
- What types of packages are available for the UC2842BD?
The device is available in 8-pin dual-in-line and surface mount (SOIC-8) packages, as well as a 14-pin plastic surface mount (SOIC-14) package.
- Is the UC2842BD Pb-free?
Yes, Pb-free packages are available.
- What are some common applications for the UC2842BD?
Common applications include off-line converters, DC-DC converters, power supplies for industrial and consumer electronics, telecom and networking equipment, and automotive systems.
