L6615D STMicroelectronics

L6615 High/low-side load share controller Datasheet - production data 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 SO8 output current of the master, which is the highest among the output currents delivered by the paralleled power supplies. The share bus Features dynamics is independent from the power supply Compliant with SSI specifications output voltage and is clamped by the device supply voltage (V ) only. The output voltage of High/low-side current sensing CC the other paralleled power supplies (slaves) is Fully compatible with remote output voltage trimmed by the ADJ pin so that they can support sensing their amount of load current. The slave power Full differential low offset current sense supplies work as current-controlled sources. 2.7 V to 22 V V operating range CC Thanks to the sharing of the output currents, the 32 k share sense amplifier input impedance thermal stress of the different modules can be equalized and provides more reliability. Moreover, Hysteretic UVLO the paralleled supply architecture allows redundancy to be achieved. The failure of one of Applications the modules can be tolerated until the capability Distributed power systems of the remaining power supplies is enough to High density DC-DC converters provide the required load current. (N+1) redundant systems, N up to 20 Table 1. Device summary SMPS for (web) servers Order code Package Packaging L6615D Tube Description SO8 L6615D013TR Tape and reel 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- August 2013 DocID8881 Rev 5 1/26 This is information on a product in full production. www.st.com 26Contents L6615 Contents 1 Typical application diagram . 3 2 Pin connection 4 3 Electrical data 5 3.1 Absolute maximum ratings . 5 3.2 Thermal data . 5 4 Electrical characteristics . 6 5 Application information . 10 5.1 Current sense section 11 5.2 Share drive amplifier (SDA), error amplifier and adjustable amplifier . 12 5.3 Designing with the L6615 . 13 5.4 Current sense methods 17 5.5 Application ideas . 18 5.6 Low voltage buses 19 5.7 Offset trimming . 20 6 Reference . 23 7 Package mechanical data 24 8 Revision history . 25 2/26 DocID8881 Rev 5