Overview
The UC3842ADR2G is a high-performance fixed-frequency current-mode controller designed by onsemi for off-line and DC-to-DC converter applications. This integrated circuit offers a cost-effective solution with minimal external components, making it ideal for a variety of power supply designs. 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 suitable for driving power MOSFETs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 10 V to 30 V | V |
| Switching Frequency | Up to 500 kHz | kHz |
| Maximum Duty Cycle | 96% | % |
| Output Current (Source or Sink) | 1.0 A | A |
| Output Energy (Capacitive Load per Cycle) | 5.0 μJ | μJ |
| Operating Temperature Range | 0°C to 70°C | °C |
| UVLO Thresholds | 16 V (on), 10 V (off) | V |
| Reference Output Voltage | 4.95 V to 5.05 V | V |
| Line Regulation | -2.0 mV to 20 mV | mV |
| Load Regulation | -3.0 mV to 25 mV | mV |
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
- Supports boost and flyback topologies
- High-power-density designs
- Cost-effective power management solution
- Stable and reliable performance
Applications
- Switched mode power supplies (SMPS)
- DC to DC converters
- Power factor correction modules
- Charge controllers for battery systems
Q & A
- What is the primary application of the UC3842ADR2G?
The UC3842ADR2G is primarily used in off-line and DC-to-DC converter applications.
- What is the maximum switching frequency of the UC3842ADR2G?
The maximum switching frequency is up to 500 kHz.
- What is the maximum duty cycle of the UC3842ADR2G?
The maximum duty cycle is 96%.
- What are the UVLO thresholds for the UC3842ADR2G?
The UVLO thresholds are 16 V (on) and 10 V (off).
- What is the reference output voltage of the UC3842ADR2G?
The reference output voltage is between 4.95 V and 5.05 V.
- Does the UC3842ADR2G support high-power-density designs?
Yes, it supports high-power-density designs.
- What protective features does the UC3842ADR2G include?
It 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 operational temperature range of the UC3842ADR2G?
The operational temperature range is from 0°C to 70°C.
- Is the UC3842ADR2G suitable for both isolated and non-isolated topologies?
Yes, it is compatible with both isolated and non-isolated topologies.
- What are some common applications of the UC3842ADR2G?
Common applications include switched mode power supplies (SMPS), DC to DC converters, power factor correction modules, and charge controllers for battery systems.
