Overview
The UC2845BD1013TR is a high-performance current mode PWM (Pulse Width Modulation) controller IC produced by STMicroelectronics. It is part of the UC284xB family, which is designed to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal number of external components. This IC is particularly suited for applications requiring precise duty cycle control, low start-up and operating currents, and robust protection features such as under-voltage lockout and current limiting.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Part Number | UC2845BD1013TR | Part number of the IC |
| Package | SO-8 | Small Outline 8-pin package |
| Grade | Industrial | Operating temperature range suitable for industrial applications |
| RoHS Compliance | Ecopack2 | Compliant with RoHS (Restriction of Hazardous Substances) regulations |
| Oscillator Frequency | Guaranteed at 250kHz | Internal oscillator frequency |
| Maximum Duty Cycle | Less than 50% | Maximum duty cycle range for this model |
| Under-Voltage Lockout (UVLO) | 8.5V (on), 7.9V (off) | UVLO thresholds for the IC |
| Operating Temperature | -40°C to 125°C | Temperature range for operation |
| Start-Up Current | Less than 0.5mA | Current required for start-up |
Key Features
- Low Start-Up and Operating Current: The IC has a start-up current of less than 0.5mA, making it energy-efficient.
- Under-Voltage Lockout with Hysteresis: Provides protection against under-voltage conditions with hysteresis to prevent oscillations.
- Internally Trimmed Reference with Under-Voltage Lockout: Ensures a precise reference voltage and includes under-voltage lockout for reliability.
- Current Limiting: Includes a PWM comparator that also provides current limit control to prevent overcurrent conditions.
- Trimmed Oscillator for Precise Frequency Control: The internal oscillator is trimmed for precise frequency control, guaranteed at 250kHz.
- Current Mode Operation to 500kHz: Supports current mode operation up to 500kHz.
- Latching PWM for Cycle-by-Cycle: Features latching PWM for cycle-by-cycle control.
- High Current Totem Pole Output: The output stage is designed to source or sink high peak current, suitable for driving N-Channel MOSFETs.
- Automatic Feed Forward Compensation: Includes automatic feed forward compensation for improved performance).
Applications
The UC2845BD1013TR is suitable for various power management applications, including:
- Off-Line Power Supplies: Ideal for designing off-line power supplies due to its under-voltage lockout and current limiting features.
- DC to DC Converters: Used in DC to DC converters, such as boost, flyback, and step-up/step-down configurations.
- Industrial Power Systems: Suitable for industrial power systems requiring robust and reliable power management solutions.
Q & A
- What is the UC2845BD1013TR used for?
The UC2845BD1013TR is a high-performance current mode PWM controller IC used in off-line and DC to DC power management applications.
- What is the package type of the UC2845BD1013TR?
The UC2845BD1013TR comes in an SO-8 (Small Outline 8-pin) package.
- What are the under-voltage lockout thresholds for the UC2845BD1013TR?
The under-voltage lockout thresholds are 8.5V (on) and 7.9V (off).
- What is the guaranteed oscillator frequency of the UC2845BD1013TR?
The oscillator frequency is guaranteed at 250kHz.
- Does the UC2845BD1013TR support current mode operation?
Yes, it supports current mode operation up to 500kHz.
- What is the start-up current of the UC2845BD1013TR?
The start-up current is less than 0.5mA.
- Is the UC2845BD1013TR RoHS compliant?
Yes, it is RoHS compliant with an Ecopack2 rating.
- What is the operating temperature range of the UC2845BD1013TR?
The operating temperature range is -40°C to 125°C.
- Can the UC2845BD1013TR drive N-Channel MOSFETs?
Yes, the output stage is designed to source or sink high peak current, making it suitable for driving N-Channel MOSFETs.
- What are some common applications of the UC2845BD1013TR?
Common applications include off-line power supplies, DC to DC converters, and industrial power systems.
