Overview
The UC3846Q, produced by Texas Instruments, is a current-mode PWM controller designed to implement fixed-frequency, current-mode control schemes in power conversion applications. This device is part of the UCx846/7 family and is known for its superior performance, which includes improved line regulation, enhanced load response characteristics, and a simpler control loop design. The UC3846Q features low outputs in the OFF state, making it suitable for various power supply designs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Pin 15) | - | - | 40 | V |
| Collector Supply Voltage (Pin 13) | - | - | 40 | V |
| Output Current, Source or Sink (Pins 11, 14) | - | - | 500 | mA |
| Operating Temperature | 0 | - | 70 | °C |
| Reference Output Voltage | 5.00 | 5.10 | 5.20 | V |
| Oscillator Frequency | 39 | 43 | 47 | kHz |
| Output Voltage Line Regulation | - | - | 20 | mV |
| Output Voltage Load Regulation | - | - | 15 | mV |
Key Features
- Automatic feedforward compensation
- Programmable pulse-by-pulse current limiting
- Automatic symmetry correction in push-pull configuration
- Enhanced load response characteristics
- Parallel operation capability for modular power systems
- Differential current sense amplifier with wide common mode range
- Double-pulse suppression protection
- 500-mA (peak) totem-pole outputs
- ±1% trimmed bandgap reference
- Soft-start capability
- Undervoltage lockout
- Shutdown function with automatic restart or latch-off option
Applications
- Telecommunication power converters
- Industrial power converters
- DC-to-DC converters
- Off-line power supplies
- Modular power systems
Q & A
- What is the UC3846Q used for? The UC3846Q is used for implementing fixed-frequency, current-mode control schemes in power conversion applications.
- What are the key features of the UC3846Q? Key features include automatic feedforward compensation, programmable pulse-by-pulse current limiting, automatic symmetry correction, and more.
- What is the maximum supply voltage for the UC3846Q? The maximum supply voltage is 40 V.
- What is the typical oscillator frequency of the UC3846Q? The typical oscillator frequency is 43 kHz.
- Does the UC3846Q have a shutdown function? Yes, it has a shutdown function with options for automatic restart or latch-off.
- What is the output current capability of the UC3846Q? The output current capability is up to 500 mA.
- Is the UC3846Q suitable for parallel operation? Yes, it supports parallel operation for modular power systems.
- What is the operating temperature range for the UC3846Q? The operating temperature range is 0°C to 70°C.
- Does the UC3846Q have built-in protection features? Yes, it includes features like undervoltage lockout, soft-start, and double-pulse suppression.
- What are some common applications of the UC3846Q? Common applications include telecommunication power converters, industrial power converters, and DC-to-DC converters.
