Overview
The UCC2808DTR-2, produced by Texas Instruments, is a low-power current-mode push-pull PWM controller. This device is part of the UCCx808-x family and is designed for use in various switching power supply applications. It features a dual output drive stage in a push-pull configuration, which allows for efficient and reliable operation. The UCC2808DTR-2 is particularly suited for applications requiring minimal external components and high frequency operation up to 1 MHz.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 5 | - | 14 | V |
| Junction Temperature (TJ) | -40 | - | 85 | °C |
| Oscillator Frequency | 175 | 194 | 213 | kHz |
| Oscillator Amplitude/VDD | 0.44 | 0.5 | 0.56 | V/V |
| Output Drive Current (Source) | - | - | 500 mA | - |
| Output Drive Current (Sink) | - | - | 1 A | - |
| Dead Time Between Outputs | 60 ns | - | 200 ns | - |
| UVLO Turn On Threshold | 4.3 V | - | - | - |
| UVLO Turn Off Threshold | 4.1 V | - | - | - |
Key Features
- Low power consumption with a typical run current of 1 mA
- Current-mode switching with minimal external parts count
- Internal soft-start and on-chip error amplifier with a 2-MHz gain bandwidth product
- On-chip VDD clamping and output drive stages capable of 500-mA peak source current and 1-A peak sink current
- Operation up to 1-MHz frequency
- Dual output drive stages in a push-pull configuration with guaranteed duty cycle of less than 50% for both outputs
- Undervoltage lockout (UVLO) protection with adjustable thresholds
- High frequency stability with minimal effect from power supply rail variations
Applications
- Server and desktop power supplies
- Telecom power supplies
- DC-DC converters
- Switched-mode power supplies
Q & A
- What is the typical run current of the UCC2808DTR-2?
The typical run current is 1 mA. - What is the maximum oscillator frequency of the UCC2808DTR-2?
The maximum oscillator frequency is up to 1 MHz. - What is the output drive capability of the UCC2808DTR-2?
The output drive stages are capable of 500-mA peak source current and 1-A peak sink current. - What is the dead time between the two output stages?
The dead time is typically between 60 ns to 200 ns. - What are the UVLO thresholds for the UCC2808DTR-2?
The UVLO turn on threshold is 4.3 V and the turn off threshold is 4.1 V. - What type of packages are available for the UCC2808DTR-2?
The device is available in SOIC (8) packages. - What is the recommended decoupling capacitor for the VDD terminal?
A 0.1-μF 0603-sized 25-V X7R capacitor is recommended. - What is the purpose of the internal soft-start feature?
The internal soft-start feature helps in gradually increasing the output voltage to prevent inrush currents and ensure stable startup. - How does the oscillator frequency stability of the UCC2808DTR-2 handle power supply rail variations?
The oscillator frequency stability is minimally affected by variations in power supply rails due to internal tracking of VDD and GND. - What are some common applications of the UCC2808DTR-2?
Common applications include server and desktop power supplies, telecom power supplies, DC-DC converters, and switched-mode power supplies.
