Overview
The UCC28083DG4 is a current-mode push-pull PWM (Pulse Width Modulation) controller manufactured by Texas Instruments. This component is part of the UCC28083/4/5/6 family, designed for use in dc-to-dc or off-line fixed-frequency current-mode power supplies. It is built using BiCMOS technology, offering a robust and efficient solution for various power conversion applications.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage (VDD) | 7.6 | 8.3 | 15 | V |
| Start Threshold Voltage (UCC28083/5) | 11.5 | 12.5 | 13.5 | V |
| Start Threshold Voltage (UCC28084/6) | 4.1 | 4.3 | 4.5 | V |
| Minimum Operating Voltage after Start (UCC28083/5) | 7.6 | 8.3 | 9.0 | V |
| Minimum Operating Voltage after Start (UCC28084/6) | 3.9 | 4.1 | 4.3 | V |
| Oscillator Frequency | 180 | 200 | 220 | kHz |
| Output Current (OUTA/OUTB) | - | - | 1 A (sink), 0.5 A (source) | A |
| Operating Temperature | -40 | - | 85 | °C |
| Package Type | - | - | 8-SOIC | - |
Key Features
- Programmable Slope Compensation: Allows for adjustable slope compensation to improve stability in current-mode control.
- Internal Soft-Start: The UCC28083 and UCC28084 have a typical soft-start interval time of 3.5 ms, while the UCC28085 and UCC28086 have less than 100 µs.
- Cycle-by-Cycle Current Limiting: Provides protection against overcurrent conditions.
- Low Start-Up Current: Typical start-up current of 120 µA and run current of 1.5 mA.
- Single External Component Oscillator: Programmable from 50 kHz to 1 MHz.
- High-Current Totem-Pole Dual Output Stage: Drives push-pull configuration with 1-A sink and 0.5-A source capability.
- Current Sense Discharge Transistor: Improves dynamic response by discharging the current-sense filter capacitor at each clock cycle.
- Internally Trimmed Bandgap Reference: Ensures stable voltage reference.
- Undervoltage Lockout with Hysteresis: Prevents operation below minimum voltage thresholds.
Applications
- High-Efficiency Switch-Mode Power Supplies: Ideal for designing efficient power supplies.
- Telecom dc-to-dc Converters: Suitable for telecommunications equipment power conversion.
- Point-of-Load or Point-of-Use Power Modules: Used in modular power systems for localized power conversion.
Q & A
- What is the typical start-up current of the UCC28083DG4?
The typical start-up current is 120 µA.
- What is the range of the programmable oscillator frequency?
The oscillator frequency can be programmed from 50 kHz to 1 MHz.
- What is the output current capability of the UCC28083DG4?
The output stages can sink up to 1 A and source up to 0.5 A.
- 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 a smooth startup.
- What types of packages are available for the UCC28083DG4?
The component is available in 8-pin SOIC (D), 8-pin TSSOP (PW), and 8-pin PDIP (P) packages.
- What is the operating temperature range of the UCC28083DG4?
The operating temperature range is from -40°C to 85°C.
- What is the function of the current sense discharge transistor?
The current sense discharge transistor improves dynamic response by discharging the current-sense filter capacitor at each clock cycle.
- Does the UCC28083DG4 have undervoltage lockout protection?
Yes, it includes undervoltage lockout with hysteresis to prevent operation below minimum voltage thresholds.
- What are some common applications of the UCC28083DG4?
Common applications include high-efficiency switch-mode power supplies, telecom dc-to-dc converters, and point-of-load or point-of-use power modules.
- How does the programmable slope compensation feature benefit the UCC28083DG4?
The programmable slope compensation helps in improving stability in current-mode control by allowing adjustable slope compensation.
