Overview
The UC3845BD1013TR is a member of the UC284xB family of control ICs produced by STMicroelectronics. This integrated circuit is designed to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. It features internally implemented circuits such as a trimmed oscillator for precise duty cycle control, a precision reference with under-voltage lockout, logic for latched operation, a PWM comparator with current limit control, and a totem pole output stage capable of sourcing or sinking high peak current. This makes it suitable for driving N-Channel MOSFETs and ideal for various power management applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SO-8 |
| Grade | Industrial |
| RoHS Compliance Grade | Ecopack2 |
| Operating Temperature (°C) | 0 to 70 |
| Input Voltage | Up to 30V |
| Oscillator Frequency | Guaranteed at 250kHz, up to 500kHz |
| Output Current | Up to 1A |
| Start-up Current | Less than 0.5mA |
| Under-voltage Lockout (UVLO) | 8.5V (on), 7.9V (off) |
| Maximum Duty Cycle | Less than 50% with internal toggle flip flop |
Key Features
- Low start-up and operating current
- Under-voltage lockout with hysteresis
- Internally trimmed reference with under-voltage lockout
- Current limiting
- Trimmed oscillator for precise frequency control
- Current mode operation up to 500kHz
- Latching PWM for cycle-by-cycle control
- High current totem pole output
- Automatic feed forward compensation
Applications
The UC3845BD1013TR is designed for use in various power management applications, including off-line and DC to DC converters. It is particularly suited for medium power quasi-resonant ZVS (Zero Voltage Switching) flyback converters and other high-frequency switching applications.
Q & A
- What is the UC3845BD1013TR used for?
The UC3845BD1013TR is used to implement off-line or DC to DC fixed frequency current mode control schemes in power management applications. - What is the operating temperature range of the UC3845BD1013TR?
The operating temperature range is from 0°C to 70°C. - What is the maximum input voltage for the UC3845BD1013TR?
The maximum input voltage is up to 30V. - What is the oscillator frequency of the UC3845BD1013TR?
The oscillator frequency is guaranteed at 250kHz and can operate up to 500kHz. - What is the under-voltage lockout (UVLO) threshold for the UC3845BD1013TR?
The UVLO thresholds are 8.5V (on) and 7.9V (off). - What is the maximum duty cycle of the UC3845BD1013TR?
The maximum duty cycle is less than 50% with the internal toggle flip flop. - What type of output stage does the UC3845BD1013TR have?
The UC3845BD1013TR has a totem pole output stage designed to source or sink high peak current. - Is the UC3845BD1013TR RoHS compliant?
Yes, the UC3845BD1013TR is RoHS compliant with an Ecopack2 grade. - What package type is the UC3845BD1013TR available in?
The UC3845BD1013TR is available in an SO-8 package. - What are some typical applications of the UC3845BD1013TR?
Typical applications include medium power quasi-resonant ZVS flyback converters and other high-frequency switching applications.
