UCC28950PW

Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance, low-power, voltage-mode PWM controller
• Package: 20-pin TSSOP (Thin Shrink Small Outline Package)
• Essence: Efficient power management solution for various applications
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Input Voltage Range: 4.5V to 14V
• Output Voltage Range: 0.8V to 12V
• Maximum Switching Frequency: 1MHz
• Operating Temperature Range: -40°C to +125°C
• Features:
  • Adaptive dead-time control
  • Programmable soft-start
  • Overcurrent protection
  • Undervoltage lockout
  • Thermal shutdown protection

Pin Configuration

The UCC28950PW has a total of 20 pins. The detailed pin configuration is as follows:

1. VDD: Power supply input
2. GND: Ground reference
3. FB: Feedback input for regulating the output voltage
4. COMP: Compensation node for loop stability
5. SS/TR: Soft-start and tracking control
6. RT/CT: Timing components for oscillator frequency and soft-start time
7. SYNC: Synchronization input for multiple ICs
8. EN/UVLO: Enable and undervoltage lockout control
9. CS: Current sense input for overcurrent protection
10. ISENSE: Current sense input for overcurrent protection
11. AGND: Analog ground reference
12. PGND: Power ground reference
13. DRVH: High-side gate driver output
14. DRVL: Low-side gate driver output
15. BOOT: Bootstrap capacitor connection for high-side gate driver
16. VCC: Supply voltage for gate drivers
17. VREF: Reference voltage output
18. SS/TR: Soft-start and tracking control
19. RT/CT: Timing components for oscillator frequency and soft-start time
20. VDD: Power supply input

Functional Features

• Adaptive dead-time control ensures efficient switching and minimizes power losses.
• Programmable soft-start allows gradual ramp-up of the output voltage, reducing inrush current.
• Overcurrent protection safeguards the circuit from excessive current flow.
• Undervoltage lockout prevents operation below a specified voltage level.
• Thermal shutdown protection shuts down the IC to prevent damage due to excessive temperature.

Advantages and Disadvantages

Advantages: - High-performance PWM controller with excellent efficiency. - Wide input and output voltage range for versatile applications. - Comprehensive protection features ensure reliable operation. - Compact TSSOP package for space-constrained designs.

Disadvantages: - Limited maximum switching frequency compared to some other ICs. - Requires external timing components for oscillator frequency and soft-start time.

Working Principles

The UCC28950PW is a voltage-mode PWM controller that regulates the output voltage by adjusting the duty cycle of the PWM signal. It operates by comparing the feedback voltage (FB) with a reference voltage (VREF) and generating a control signal to drive the power switches. The adaptive dead-time control optimizes the switching transitions to minimize power losses. The soft-start feature gradually increases the duty cycle during startup to limit the inrush current. Various protection mechanisms, such as overcurrent protection and thermal shutdown, ensure safe operation under different conditions.

Application Field Plans

The UCC28950PW is widely used in various power management applications, including but not limited to: - Switching power supplies - DC-DC converters - LED lighting systems - Industrial automation equipment - Telecommunications infrastructure

Alternative Models

For alternative options, consider the following models: - UCC28950PW-1: Similar specifications and features, but with a different pin configuration. - UCC28951PW: Higher maximum switching frequency and additional features like adjustable slope compensation.

These alternative models provide flexibility in choosing the most suitable PWM controller for specific application requirements.

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