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L6615：High/low side load share controller

This controller IC is specifically designed to achieve load sharing of paralleled and independent power supply modules in distributed power systems, by adding only few external components. Current sharing is achieved through a single wire connection (share bus) common to the paralleled modules. Load sharing is a technique used in all systems in which the load requires low voltage, high-current and/or redundancy: for this reason a modular power system with two or more power supplies or DC-DC converters in parallel is required. The device performs both high-side and low-side current sensing, in this manner the sense current resistor can be placed either in series to the power supply output or on the ground return. The L6615 drives the share bus to a voltage proportional to the output current of the master, which is the highest among the output currents delivered by the paralleled power supplies. The share bus dynamics is independent from the power supply output voltage and is clamped by the device supply voltage (V_CC) only. The output voltage of the other paralleled power supplies (slaves) is trimmed by the ADJ pin so that they can support their amount of load current. The slave power supplies work as current-controlled sources. Thanks to the sharing of the output currents, the thermal stress of the different modules can be equalized and provides more reliability. Moreover, the paralleled supply architecture allows redundancy to be achieved. The failure of one of the modules can be tolerated until the capability of the remaining power supplies is enough to provide the required load current.

Key Features

• Compliant with SSI specifications
• High/low-side current sensing
• Fully compatible with remote output voltage sensing
• Full differential low offset current sense
• 2.7 V to 22 V VCC operating range
• 32 kΩ share sense amplifier input impedance
• Hysteretic UVLO

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应用手册

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质量和可靠性