Overview
The UC2844BD1013TR is a high-performance current mode PWM controller from STMicroelectronics, part of the UC284xB family. This IC is designed to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. It features a trimmed oscillator for precise frequency control, automatic feed-forward compensation, and latching PWM for cycle-by-cycle current limiting. The device is suitable for driving N-Channel MOSFETs and includes an internally trimmed reference with undervoltage lockout, ensuring reliable operation in various power supply applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (low impedance source) | 30 | V |
| Output Current | ±1 | A |
| Oscillator Frequency | 49 kHz to 250 kHz | kHz |
| Reference Voltage | 4.95 to 5.05 | V |
| Under-Voltage Lockout (UVLO) Start Threshold | 16 V | V |
| Under-Voltage Lockout (UVLO) Minimum Operating Voltage | 10 V | V |
| Maximum Duty Cycle | 47% to 50% | % |
| Output Low Level (ISINK = 20mA) | 0.1 to 0.4 | V |
| Output High Level (ISOURCE = 20mA) | 13 to 13.5 | V |
| Power Dissipation at Tamb ≤ 25 °C (SO8) | 800 mW | mW |
| Storage Temperature Range | -65 to 150 | °C |
| Junction Operating Temperature | -40 to 150 | °C |
Key Features
- Trimmed oscillator for precise frequency control up to 500 kHz
- Automatic feed-forward compensation
- Latching PWM for cycle-by-cycle current limiting
- Internally trimmed reference with undervoltage lockout
- High current totem pole output stage suitable for driving N-Channel MOSFETs
- Low start-up and operating current (less than 0.5 mA start-up current)
- PWM comparator with current limit control
- Under-voltage lockout with hysteresis
- Programmable oscillator frequency and maximum output duty cycle using RT and CT components
Applications
The UC2844BD1013TR is ideal for various power supply applications, including:
- Off-line power supplies
- DC to DC converters
- Switch-mode power supplies requiring high precision and reliability
- Industrial power systems
- Aerospace and automotive power systems where robust and efficient power management is critical
Q & A
- What is the primary function of the UC2844BD1013TR?
The UC2844BD1013TR is a high-performance current mode PWM controller designed to implement off-line or DC to DC fixed frequency current mode control schemes.
- What is the range of the oscillator frequency for the UC2844BD1013TR?
The oscillator frequency can be programmed up to 500 kHz using the RT and CT components.
- What is the under-voltage lockout (UVLO) start threshold for the UC2844BD1013TR?
The UVLO start threshold is 16 V.
- What is the maximum duty cycle for the UC2844BD1013TR?
The maximum duty cycle is 47% to 50%.
- How much current can the output stage of the UC2844BD1013TR handle?
The output stage can source or sink peak currents up to 1 A.
- What is the power dissipation limit for the UC2844BD1013TR in an SO8 package?
The power dissipation limit is 800 mW at Tamb ≤ 25 °C.
- What is the storage temperature range for the UC2844BD1013TR?
The storage temperature range is -65 to 150 °C.
- What type of MOSFETs can the UC2844BD1013TR drive?
The UC2844BD1013TR is suitable for driving N-Channel MOSFETs.
- How does the UC2844BD1013TR handle cycle-by-cycle current limiting?
The device features latching PWM for cycle-by-cycle current limiting.
- What are some typical applications for the UC2844BD1013TR?
Typical applications include off-line power supplies, DC to DC converters, and switch-mode power supplies in industrial, aerospace, and automotive systems.
