UC2853DTR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance PWM Controller
• Package: SOIC-16
• Essence: Regulates and controls power delivery in various applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 2.5V to 37V
• Switching Frequency: 100kHz to 1MHz
• Duty Cycle Range: 0% to 100%
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The UC2853DTR IC has a total of 16 pins, which are as follows:

1. COMP: Compensation pin for external compensation network.
2. FB: Feedback pin for regulating the output voltage.
3. VREF: Reference voltage output pin.
4. RT/CT: Timing resistor/capacitor connection pin for setting the oscillator frequency.
5. CT: Timing capacitor connection pin for setting the oscillator frequency.
6. RT: Timing resistor connection pin for setting the oscillator frequency.
7. GND: Ground pin for IC.
8. VCC: Supply voltage input pin.
9. SYNC: Synchronization input pin for synchronizing multiple devices.
10. OSC: Oscillator timing capacitor connection pin.
11. OSC: Oscillator timing resistor connection pin.
12. DTC: Dead-time control pin for adjusting the dead time between high-side and low-side MOSFETs.
13. OUT: Output pin for driving external power MOSFET.
14. SS/TR: Soft-start/Tracking pin for controlling the soft-start time and tracking function.
15. UVLO: Under-voltage lockout pin for monitoring the input voltage level.
16. VSENSE: Current sense input pin for sensing the current flowing through the power MOSFET.

Functional Features

• High-performance PWM controller with adjustable frequency and duty cycle.
• Provides precise regulation of output voltage in various applications.
• Incorporates soft-start and tracking functions for controlled startup.
• Offers under-voltage lockout protection to prevent damage during low input voltage conditions.
• Enables synchronization of multiple devices for parallel operation.
• Supports dead-time control for efficient switching between high-side and low-side MOSFETs.

Advantages and Disadvantages

Advantages: - Wide input and output voltage range allows for versatile applications. - Adjustable frequency and duty cycle provide flexibility in power management. - Soft-start and tracking functions ensure smooth and controlled startup. - Synchronization capability enables parallel operation for higher power requirements.

Disadvantages: - Limited operating temperature range (-40°C to +85°C). - Requires external compensation network for stability. - Not suitable for applications requiring extremely high switching frequencies.

Working Principles

The UC2853DTR is a high-performance PWM controller that regulates and controls power delivery in various applications. It operates by comparing the feedback voltage (FB) with the reference voltage (VREF) to generate an error signal. This error signal is then processed by the internal circuitry to adjust the duty cycle of the output waveform, which in turn regulates the output voltage.

The oscillator frequency and duty cycle can be adjusted using external timing components connected to the RT/CT pins. The soft-start function gradually increases the duty cycle during startup, preventing excessive inrush current. The dead-time control feature ensures proper time intervals between the high-side and low-side MOSFETs' switching to avoid shoot-through currents.

Detailed Application Field Plans

The UC2853DTR is widely used in various power management applications, including:

1. Switching Power Supplies: Used as a primary controller in flyback, forward, and push-pull converter topologies.
2. LED Lighting: Provides precise regulation of LED driver circuits for efficient and reliable lighting solutions.
3. Motor Control: Enables accurate control of motor speed and torque in applications such as fans, pumps, and robotics.
4. Battery Charging: Facilitates controlled charging of batteries in portable devices, electric vehicles, and renewable energy systems.
5. Audio Amplifiers: Regulates power delivery to audio amplifiers, ensuring optimal performance and protection.

Detailed and Complete Alternative Models

1. UC3843: Similar high-performance PWM controller with adjustable frequency and duty cycle. Package: DIP-8.
2. TL494: PWM controller with adjustable frequency and duty cycle. Offers additional features like error amplifier and shutdown function. Package: SOIC-16.
3. SG3525: PWM controller with adjustable frequency and duty cycle. Suitable for high-power applications. Package: DIP-16.
4. LT1241: High-performance PWM controller with adjustable frequency and duty cycle. Offers wide input voltage range. Package: SOIC-14.
5. MAX668: PWM controller with adjustable frequency and duty cycle