Overview
The UCC29002DR/1, produced by Texas Instruments, is an advanced, high-performance load-share controller designed to parallel multiple independent power supplies or DC-to-DC modules. This device is part of the UCC29002 family, which includes the UCC29002 and UCC29002-1 variants. It is based on the automatic leader/follower architecture, similar to its predecessor UC3902 and UC3907 load-share controllers. The UCC29002DR/1 is suitable for high-reliability applications in servers, workstations, telecom, and other distributed power systems, particularly in N+1 redundant systems or high-current applications where off-the-shelf power supplies need to be paralleled.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Current (Idle State) | LS = floating (open pin), VADJ = 5V | 2.5 | 3.5 | mA | |
| VDD Clamp Voltage | IVDD = 6mA | 13.5 | 14.25 | 15 | V |
| Start-up Voltage Threshold (VDD rising) | 4.175 | 4.375 | 4.575 | V | |
| Hysteresis to UVLO (VDD falling) | 0.2 | 0.375 | 0.55 | V | |
| Input Offset Voltage (Current-Sense Amplifier) | TA = 25 °C, VIC = 0.5V or 11.5V, VCSO = 5 V | -100 | 100 | µV | |
| Operating Temperature Range | -40 | 105 | °C | ||
| Package Type | SOIC (8), VSSOP (8), PDIP (8) |
Key Features
- High accuracy: Capable of less than 1% current-share error at full load.
- High-side or low-side (GND-referenced) current-sense capability.
- Ultra-low offset current-sense amplifier.
- Single-wire load-share bus.
- Full scale adjustability.
- Intel® SSI load-share specification compliant.
- Disconnect from load-share bus at stand-by.
- Load-share bus protection against shorts to GND or to the supply rail.
- Compact 8-pin VSSOP package minimizes space.
- Lead-free assembly.
Applications
- Modules with remote-sense capability.
- In conjunction with the internal feedback E/A of OEM power supply units.
- High-reliability applications in servers, workstations, telecom, and other distributed power systems.
- N+1 redundant systems or high-current applications where off-the-shelf power supplies must be paralleled.
Q & A
- What is the primary function of the UCC29002DR/1?
The UCC29002DR/1 is designed to parallel multiple independent power supplies or DC-to-DC modules, ensuring balanced current distribution among them.
- What is the accuracy of the current-share error at full load?
The device is capable of less than 1% current-share error at full load.
- Can the current-sense resistor be placed in either the GND return path or the positive output rail?
- What is the operating temperature range for the UCC29002DR/1?
The operating temperature range is -40 °C to 105 °C.
- What types of packages are available for the UCC29002DR/1?
The device is available in SOIC (8), VSSOP (8), and PDIP (8) packages.
- Is the UCC29002DR/1 compliant with Intel® SSI load-share specifications?
- How does the load-share bus protection work?
The device features load-share bus protection against shorts to GND or to the supply rail.
- What is the purpose of the start-up and adjust logic in the UCC29002DR/1?
The start-up and adjust logic imposes certain operating modes during start-up, fault, and disable conditions to ensure correct output voltage adjustment.
- Can the UCC29002DR/1 be used in high-voltage applications?
- What is the role of the bias input and bias_OK circuit in the UCC29002DR/1?
The bias input and bias_OK circuit ensure the device operates within the recommended voltage range and provides necessary bias voltage through a current-limiting resistor if needed.
