Overview
The UC2902DTR, produced by Texas Instruments, is an 8-pin load share controller designed to balance the current drawn from independent, paralleled power supplies. This device ensures that each power supply contributes its share of the load current proportionally, making it ideal for distributed power systems. The UC2902DTR operates within a voltage range of 2.7-V to 20-V and is compatible with existing power supply designs that incorporate remote output voltage sensing.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Input Voltage Range | -0.3 | 20 | V | |
| SENSE Input Voltage Range | -5 | 5 | V | |
| SHARE+ and SHARE- Voltage Range | -0.3 | 10 | V | |
| Operating Free-Air Temperature Range | -40 | 100 | °C | |
| Junction Temperature Range | -55 | 105 | °C | |
| Supply Current (ICC) | 4 | 6 | 10 | mA |
| Undervoltage Lockout (VCC Startup Voltage) | 2.3 | 2.5 | 2.7 | V |
| Current Sense Amplifier Gain | -41 | -40 | -39 | |
| SHARE+ High-Level Output Voltage | 9.6 | 10.0 | 10.4 | V |
| SHARE+ Low-Level Output Voltage | 20 | 50 | mV |
Key Features
- Operates within a voltage range of 2.7-V to 20-V
- 8-pin package with minimal external component requirements
- Compatible with existing power supply designs incorporating remote output voltage sensing
- Differential share bus for enhanced noise immunity
- Precision current sense amplifier with a gain of 40
- Undervoltage lockout (UVLO) circuitry
- User-programmable share loop compensation
Applications
The UC2902DTR is primarily used in paralleled power supplies to ensure balanced current distribution. It is suitable for distributed power systems where multiple power supplies need to share the load current proportionally. This device is particularly useful in applications where high reliability and precision current sharing are critical, such as in data centers, telecommunications equipment, and other high-power systems.
Q & A
- What is the primary function of the UC2902DTR?
The UC2902DTR is a load share controller that balances the current drawn from independent, paralleled power supplies. - What is the operating voltage range of the UC2902DTR?
The UC2902DTR operates within a voltage range of 2.7-V to 20-V. - What type of package does the UC2902DTR come in?
The UC2902DTR is available in 8-pin SOIC (D) and Plastic DIP (N) packages. - How does the UC2902DTR ensure noise immunity?
The UC2902DTR uses a differential share bus to maximize noise immunity. - What is the gain of the current sense amplifier in the UC2902DTR?
The current sense amplifier has a gain of 40. - Does the UC2902DTR have undervoltage lockout (UVLO) circuitry?
Yes, the UC2902DTR includes UVLO circuitry. - Can the share loop compensation in the UC2902DTR be user-programmed?
Yes, the share loop compensation in the UC2902DTR is user-programmable. - What are the typical applications of the UC2902DTR?
The UC2902DTR is used in paralleled power supplies, particularly in distributed power systems such as data centers and telecommunications equipment. - How does the UC2902DTR handle different output current capabilities among paralleled supplies?
The UC2902DTR allows supplies with different output current capabilities to be paralleled by appropriately scaling the current sense resistor. - What precautions should be taken to prevent electrostatic damage to the UC2902DTR?
The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
