Overview
The UCC2808DTR-1 is a low-power, current-mode push-pull PWM controller produced by Texas Instruments. This device is part of the UCCx808-x family and is designed for use in switched-mode power supplies, DC-DC converters, and other high-efficiency power management applications. It features a dual output drive stage in a push-pull configuration, internal soft-start, and on-chip error amplifier with a 2-MHz gain bandwidth product. The UCC2808DTR-1 is available in an SOIC (D) package and operates over a junction temperature range of –40°C to 85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 13 | - | 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 |
| Error Amplifier Input Voltage | 1.95 | 2 | 2.05 | V |
| Error Amplifier Open-Loop Voltage Gain | 60 | 80 | - | dB |
| Output Stage Peak Source Current | - | - | 500 mA | - |
| Output Stage Peak Sink Current | - | - | 1 A | - |
| UnderVoltage LockOut (UVLO) Turn On Threshold | - | 12.5 | - | V |
| UnderVoltage LockOut (UVLO) Turn Off Threshold | - | 8.3 | - | V |
Key Features
- Low power consumption with a typical run current of 1 mA.
- Operation up to 1 MHz.
- Internal soft-start to prevent inrush current.
- On-chip error amplifier with a 2-MHz gain bandwidth product.
- On-chip VDD clamping.
- Dual output drive stages capable of 500-mA peak source current and 1-A peak sink current.
- Push-pull configuration with dead time between outputs to prevent simultaneous switching.
- UnderVoltage LockOut (UVLO) protection with thresholds of 12.5 V and 8.3 V for turn-on and turn-off respectively.
- Internal oscillator with frequency programmable via external resistor and capacitor.
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-1?
The typical run current is 1 mA.
- What is the maximum operating frequency of the UCC2808DTR-1?
The device can operate up to 1 MHz.
- Does the UCC2808DTR-1 have internal soft-start capability?
Yes, it features internal soft-start to prevent inrush current.
- What is the gain bandwidth product of the error amplifier in the UCC2808DTR-1?
The error amplifier has a 2-MHz gain bandwidth product.
- What is the peak source and sink current capability of the output stages?
The output stages are capable of 500-mA peak source current and 1-A peak sink current.
- How is the oscillator frequency programmed in the UCC2808DTR-1?
The oscillator frequency is programmable via external resistor and capacitor connected to the RC pin.
- What are the UVLO thresholds for the UCC2808DTR-1?
The UVLO turn-on threshold is 12.5 V and the turn-off threshold is 8.3 V.
- What are the recommended decoupling capacitors for the VDD terminal?
Ceramic capacitors with stable dielectric characteristics over temperature, such as X7R or better, are recommended. A 0.1-µF 0603-sized 25-V X7R capacitor is suggested.
- What are the typical applications of the UCC2808DTR-1?
Server and desktop power supplies, telecom power supplies, DC-DC converters, and switched-mode power supplies.
- What is the package type and pin count of the UCC2808DTR-1?
The device is available in an SOIC (D) package with 8 pins.
