Overview
The UCC28089DRG4 is a power management integrated circuit (IC) from Texas Instruments, designed as a primary-side companion controller for cascaded converters with secondary-side control. This device is particularly suited for use in dc-to-dc or off-line fixed-frequency switching power supplies. It features a dual alternating output stage in a push-pull configuration, making it ideal for applications such as cascaded buck converters, ac link inverter topologies, and modified square wave inverters.
Key Specifications
| Parameter | Symbol | Rating/Value | Units |
|---|---|---|---|
| Supply Voltage | VDD | 15 | V |
| Supply Current | IDD | 20 | mA |
| Output Sink Current (Peak) | IOUT(sink) | 1.0 | A |
| Output Source Current (Peak) | IOUT(source) | 0.5 | A |
| SYNC Sink Current (Peak) | 50 | mA | |
| SYNC Source Current (Peak) | 50 | mA | |
| Analog Inputs (DIS, CT, CS) | - | -0.3 to VDD + 0.3, not to exceed 5 V | V |
| Power Dissipation at TA = 25°C (D package) | - | 650 | mW |
| Timing Capacitor Range | CT | 100 - 100,000 | pF |
| Timing Charge Resistor Range | RA | 32 - 750 | kΩ |
| Discharge Resistor Range | RB | 0 - 250 | kΩ |
| Switching Frequency | fSW | Up to 1 MHz | - |
| Junction Temperature | TJ | -40 to 105 | °C |
Key Features
- Dual alternating output stages in a push-pull configuration, with each output capable of sinking 1 A and sourcing 0.5 A.
- Primary-side under-voltage protection (UVLO) with turn-on/off thresholds of 10.5 V/8.0 V.
- Over-current protection triggered when the voltage at the current sense pin (CS) rises above 0.75 V.
- Dead-time programming and synchronization output providing dead-time information.
- Soft-start and retry after fault durations that scale with oscillator frequency for high performance fault recovery.
- Oscillator timing capacitor and discharge pin for external dead-time programming.
- Capability to synchronize multiple UCC28089 controllers to an external signal.
Applications
- Cascaded buck converters for converting moderate bus voltages to sub 2-V output voltages.
- Ac link inverter topologies.
- Modified square wave inverters for remote or dc-only power systems.
- Isolated power systems where the majority of control functions are performed on the secondary side.
- DC link and off-line self-bias or auxiliary bias supplies.
Q & A
- What is the primary function of the UCC28089DRG4?
The UCC28089DRG4 is a primary-side companion controller for cascaded converters with secondary-side control, optimized for use in dc-to-dc or off-line fixed-frequency switching power supplies.
- What is the configuration of the output stages in the UCC28089DRG4?
The device features dual alternating output stages in a push-pull configuration.
- What are the current capabilities of the output drivers?
Each output driver is capable of sinking 1 A and sourcing 0.5 A.
- What protection features does the UCC28089DRG4 include?
The device includes primary-side under-voltage protection (UVLO) and over-current protection.
- How does the UCC28089DRG4 handle fault recovery?
The soft-start and retry after fault durations scale with oscillator frequency for high performance fault recovery.
- Can the UCC28089DRG4 be synchronized to an external signal?
Yes, multiple UCC28089 controllers can be synchronized to a common external clock signal.
- What is the recommended oscillator frequency range for the UCC28089DRG4?
The recommended oscillator frequency range is up to 1 MHz.
- What are the typical applications of the UCC28089DRG4?
Typical applications include cascaded buck converters, ac link inverter topologies, and modified square wave inverters.
- How does the UCC28089DRG4 manage dead-time?
The device allows for dead-time programming and provides synchronization output with dead-time information.
- What is the junction temperature range for the UCC28089DRG4?
The junction temperature range is -40°C to 105°C.
