UCC2808AQDR-1G4Q1

Overview

Product Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - Low-power current mode PWM controller - Designed for off-line and DC-to-DC converter applications - Provides necessary features to implement a complete power supply control system - Suitable for low-power applications such as battery chargers, standby power supplies, and auxiliary power supplies

Package: SOIC-8

Essence: The UCC2808AQDR-1G4Q1 is an integrated circuit that serves as a low-power current mode PWM controller. It is specifically designed for off-line and DC-to-DC converter applications, providing the necessary features to implement a complete power supply control system.

Packaging/Quantity: The UCC2808AQDR-1G4Q1 is available in a small outline integrated circuit (SOIC) package with 8 pins. It is typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage Range: 3 V to 20 V
• Operating Temperature Range: -40°C to 85°C
• Output Current: ±0.5 A
• Frequency Range: 50 kHz to 1 MHz
• Duty Cycle Range: 0% to 100%
• Error Amplifier Bandwidth: 10 kHz
• Maximum Duty Cycle Clamp: 100%
• Oscillator Frequency Accuracy: ±5%

Pin Configuration

The UCC2808AQDR-1G4Q1 has the following pin configuration:

1. COMP: Compensation pin for error amplifier
2. FB: Feedback pin for voltage regulation
3. CS: Current sense input pin
4. GND: Ground reference pin
5. VREF: Reference voltage output pin
6. RT/CT: Timing resistor/capacitor connection pin
7. OUT: Output pin for PWM signal
8. VCC: Supply voltage input pin

Functional Features

1. Low-power Current Mode Control: The UCC2808AQDR-1G4Q1 operates in current mode control, providing efficient power management with low power consumption.

2. Wide Input Voltage Range: With a supply voltage range of 3 V to 20 V, the UCC2808AQDR-1G4Q1 can be used in various applications with different power supply requirements.

3. Flexible Frequency and Duty Cycle Control: The device allows adjustable frequency ranging from 50 kHz to 1 MHz and duty cycle control from 0% to 100%, enabling precise regulation of power output.

4. Error Amplifier Compensation: The built-in error amplifier with a bandwidth of 10 kHz ensures accurate voltage regulation by compensating for any deviations.

5. Maximum Duty Cycle Clamp: The UCC2808AQDR-1G4Q1 includes a maximum duty cycle clamp feature that prevents the duty cycle from exceeding 100%, ensuring safe operation.

Advantages and Disadvantages

Advantages: - Low-power consumption - Wide input voltage range - Precise frequency and duty cycle control - Accurate voltage regulation - Maximum duty cycle clamp for safety

Disadvantages: - Limited output current capability (±0.5 A)

Working Principles

The UCC2808AQDR-1G4Q1 operates based on the current mode control principle. It compares the sensed current through the power switch with a reference voltage to generate a control signal. This control signal is then used to adjust the duty cycle of the PWM signal, regulating the power output accordingly. The error amplifier ensures accurate voltage regulation by compensating for any deviations between the desired output voltage and the actual output voltage.

Application Field Plans

The UCC2808AQDR-1G4Q1 is suitable for a wide range of low-power applications, including but not limited to:

1. Battery Chargers: The device can be used in battery chargers to regulate the charging voltage and current, ensuring safe and efficient charging of batteries.

2. Standby Power Supplies: It can be employed in standby power supplies to maintain a stable output voltage during periods of low power consumption, such as when electronic devices are in standby mode.

3. Auxiliary Power Supplies: The UCC2808AQDR-1G4Q1 can be utilized in auxiliary power supplies to provide regulated power for various auxiliary functions in electronic systems.

Alternative Models

Here are some alternative models that offer similar functionality to the UCC2808AQDR-1G4Q1:

1. LM5039: Low-power current mode PWM controller with integrated high-voltage startup circuitry.
2. UC3842: Current mode PWM controller with wider input voltage range and higher output current capability.
3. LT1241: Low-power current mode PWM controller with adjustable frequency and duty cycle control.

These alternative