Overview
The UC2842BD1 from STMicroelectronics is a high-performance current mode PWM (Pulse Width Modulation) controller. This integrated circuit is part of the UC284xB family, designed to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal number of external components. The UC2842BD1 is particularly suited for applications requiring precise frequency control and high current handling capabilities.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Type of integrated circuit | PMIC | |
| Kind of integrated circuit | PWM controller | |
| Output current | 1 A | |
| Frequency | 48...500 kHz | |
| Number of channels | 1 | |
| Case | SO8 | |
| Mounting | SMD | |
| Operating temperature | -25...85°C | |
| Topology | Boost, flyback | |
| Duty cycle factor | 0...96% | |
| Operating voltage | 10...36 V | |
| Power dissipation | 0.8 W | |
| Under-voltage lockout thresholds | 16 V (on), 10 V (off) |
Key Features
- Trimmed Oscillator: Provides precise frequency control up to 500 kHz.
- Current Mode Operation: Allows for cycle-by-cycle current limiting.
- Automatic Feed Forward Compensation: Enhances stability and performance.
- Latching PWM: Ensures safe operation by preventing overcurrent conditions.
- Internally Trimmed Reference: Offers high accuracy with under-voltage lockout and hysteresis.
- High Current Totem Pole Output: Capable of sourcing or sinking high peak currents, suitable for driving N-Channel MOSFETs.
- Low Start-Up and Operating Current: Minimizes power consumption.
- External Duty Cycle Clamp and Multi-Unit Synchronization: Allows for flexible control and synchronization of multiple units.
- Soft-Start Capability: Reduces inrush current during startup.
Applications
The UC2842BD1 is ideal for various power supply applications, including:
- Off-line power supplies
- DC to DC converters
- Switch-mode power supplies
- High-efficiency power management systems
- Industrial and consumer electronics requiring robust and reliable power control
Q & A
- What is the operating frequency range of the UC2842BD1?
The UC2842BD1 operates within a frequency range of 48 kHz to 500 kHz.
- What is the maximum output current of the UC2842BD1?
The maximum output current is 1 A.
- What are the under-voltage lockout thresholds for the UC2842BD1?
The under-voltage lockout thresholds are 16 V (on) and 10 V (off).
- What is the operating temperature range of the UC2842BD1?
The operating temperature range is -25°C to 85°C.
- What are the typical applications of the UC2842BD1?
Typical applications include off-line power supplies, DC to DC converters, switch-mode power supplies, and high-efficiency power management systems.
- Does the UC2842BD1 support soft-start functionality?
- What is the power dissipation of the UC2842BD1 in an SO8 package?
The power dissipation is 0.8 W.
- Can the UC2842BD1 be synchronized with external clocks?
- What is the duty cycle range of the UC2842BD1?
The duty cycle range can approach 100% for certain models in the UC284xB family.
- How is the oscillator frequency programmed in the UC2842BD1?
The oscillator frequency is programmed by connecting a resistor (RT) to Vref and a capacitor (CT) to ground.
