Overview
The UCC2808AQDR-1Q1 is a low-power, current-mode push-pull PWM controller from Texas Instruments. This BiCMOS device is designed for high-speed, off-line or DC-to-DC fixed frequency switching power supplies with a minimal external parts count. It features dual output drive stages in a push-pull configuration, making it suitable for a variety of power supply applications. The controller includes an internal soft start, on-chip error amplifier, and on-chip VDD clamping, enhancing its performance and reliability.
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 | 48 | 49 | 50 | % |
| Minimum Duty Cycle | 0 | - | - | % |
| Startup Current | 130 | 260 | - | µA |
| Operating Supply Current | 1 | 2 | - | mA |
| Output High Level | 0.5 | 1 | - | V |
| Output Low Level | 0.5 | 1.1 | - | V |
| Undervoltage Lockout Start Threshold | 11.5 | 12.5 | 13.5 | V |
| Minimum Operating Voltage After Start | 7.6 | 8.3 | 9 | V |
| Package Type | - | - | SOIC (D) | - |
| Operating Temperature Range | -40 | - | 125 | °C |
Key Features
- Qualified for automotive applications
- ESD protection exceeds 1500 V per MIL-STD-883, Method 3015; exceeds 200 V using Machine Model (C = 200 pF, R = 0)
- Dual output drive stages in push-pull configuration
- Current sense discharge transistor to improve dynamic response
- Internal soft start and on-chip error amplifier with 2-MHz gain bandwidth product
- On-chip VDD clamping
- Output drive stages capable of 500-mA peak-source current, 1-A peak-sink current
- Operation up to 1 MHz
- Internal discharge transistor from the CS pin to ground to minimize filter capacitor values and current sense delay
Applications
- Off-line or DC-to-DC fixed frequency switching power supplies
- Automotive power systems
- Battery-powered systems
- High-frequency power converters requiring minimal external components
- Power supplies in industrial and consumer electronics
Q & A
- What is the typical oscillator frequency of the UCC2808AQDR-1Q1?
The typical oscillator frequency is around 194 kHz.
- What is the maximum duty cycle of the UCC2808AQDR-1Q1?
The maximum duty cycle is 50%.
- What is the startup current of the UCC2808AQDR-1Q1?
The startup current is typically 260 µA.
- What is the operating supply current of the UCC2808AQDR-1Q1?
The operating supply current is typically 2 mA.
- What is the undervoltage lockout start threshold for the UCC2808AQDR-1Q1?
The undervoltage lockout start threshold is between 11.5 V and 13.5 V.
- What is the minimum operating voltage after start for the UCC2808AQDR-1Q1?
The minimum operating voltage after start is between 7.6 V and 9 V.
- What type of package does the UCC2808AQDR-1Q1 come in?
The UCC2808AQDR-1Q1 comes in an SOIC (D) package.
- What is the operating temperature range of the UCC2808AQDR-1Q1?
The operating temperature range is from -40°C to 125°C.
- Does the UCC2808AQDR-1Q1 have ESD protection?
Yes, it exceeds 1500 V per MIL-STD-883, Method 3015, and 200 V using Machine Model (C = 200 pF, R = 0).
- What is the purpose of the internal discharge transistor in the UCC2808AQDR-1Q1?
The internal discharge transistor discharges the current sense filter capacitor to improve dynamic performance of the power converter.
