Overview
The UCC3808ADTR-1G4 is a low-power current-mode push-pull PWM controller produced by Texas Instruments. It is an enhanced version of the UCC3808 family, featuring internal discharge transistors that minimize filter capacitor values and current sense delay. This device is designed for use in offline and battery-powered systems, offering robust and efficient control over power MOSFETs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Oscillator Frequency | 175 | 194 | 213 | kHz |
| Oscillator Amplitude/VDD | 0.44 | 0.5 | 0.56 | V/V |
| Maximum Duty Cycle | - | - | 49% | - |
| Gate Drive (Typ) | - | 1 | - | A |
| Operating Temperature Range | 0 | - | 70 | °C |
| Output Stage Peak Source Current | - | 500 | - | mA |
| Output Stage Peak Sink Current | - | 1 | - | A |
| Package Type | - | SOIC (8) | - | - |
| Body Size (Nom) | - | 4.90 mm × 3.91 mm | - | - |
Key Features
- Low-power current-mode push-pull PWM controller.
- Internal discharge transistor to minimize filter capacitor values and current sense delay.
- Dual-output drive stages in a push-pull configuration, switching at half the oscillator frequency.
- High-current output drivers capable of 500-mA peak source current and 1-A peak sink current.
- Full cycle soft start implemented as a clamp on the maximum COMP voltage.
- Low impedance output stages to reduce the need for external Schottky clamp diodes.
- Compact SOIC (8) package with dimensions of 4.90 mm × 3.91 mm.
Applications
The UCC3808ADTR-1G4 is suitable for various power management applications, including:
- Offline power supplies.
- Battery-powered systems.
- DC-DC converters.
- Motor control systems.
- Other high-efficiency power conversion applications requiring robust and efficient PWM control.
Q & A
- What is the typical oscillator frequency of the UCC3808ADTR-1G4?
The typical oscillator frequency is 194 kHz. - What is the maximum duty cycle of the UCC3808ADTR-1G4?
The maximum duty cycle is 49%. - What is the peak source current of the output stages?
The peak source current is 500 mA. - What is the peak sink current of the output stages?
The peak sink current is 1 A. - What is the operating temperature range of the UCC3808ADTR-1G4?
The operating temperature range is from 0°C to 70°C. - Does the UCC3808ADTR-1G4 have built-in soft start capability?
Yes, it features built-in full cycle soft start. - What is the purpose of the internal discharge transistor?
The internal discharge transistor minimizes filter capacitor values and current sense delay. - What type of package does the UCC3808ADTR-1G4 come in?
The UCC3808ADTR-1G4 comes in an SOIC (8) package. - What are the dimensions of the SOIC package?
The dimensions are 4.90 mm × 3.91 mm. - Is the UCC3808ADTR-1G4 suitable for high-frequency operations?
Yes, it is designed for high-frequency operation and recommends a low-impedance printed-circuit board ground plane.
