data brief for further information contact your local stmicroelectronics sales office. february 2010 doc id 17166 rev 1 1/5 5 STEVAL-ISQ009V1 load share controller demonstr ation board based on the l6615 features three paralleled dc-dc c onverter modules (in synchronous buck topology, managed by st?s l6910) output currents shared through st current sharing controller l6615 innovative use of a mosfet as both the or- ing element (replacing or-ing diode) and sensing element (r ds(on) ) rohs compliant description the STEVAL-ISQ009V1 demonstration board is composed of three identical sections (daughterboards) and a motherboard. each daughterboard is capable of performing dc- dc conversion starting from +5 vdc and is designed to deliver 3.3 v / 5 a to the load. the input terminals of the motherboard are connected to a +5 vdc external source and the output terminals to the load. the board can accommodate up to three dc-dc converters. the motherboard contains the circuitry necessary to perform current shar ing (utilizin g the l6615) and to isolate a failed section from the load. it is designed to be adaptable to all power supplies (compatible with the l6615 absolute maximum ratings) having remote sense pins. by changing just a few components, it can be modified for new specifications. it is possible to build a system to supply a 10 a load at +3.3 v in a 2+1 redundant configuration. that is, whenever three sections are running, each of them supplies 3.33 a, a value lower than its nominal capability. if one of them is switched off, the system is able to supply the load, and each section carries 5 a. dc-dc conversion management is performed by the l6910. it is possible to verify that disabling one section (through the relevant switch on the motherboard) does not cause overvoltage on the output or overcurrent in other sect ions. in the same way, enabling one section (with the other two already running) does not cause negative output voltage drop or a short to ground, and current sharing is established. STEVAL-ISQ009V1 www.st.com
schematic diagrams STEVAL-ISQ009V1 2/5 doc id 17166 rev 1 1 schematic diagrams figure 1. single daughterboard circuit schematic isq009v1_schematic_1 , 2 # n # # # 1 $ 5 , 6 # # / 5 4 6 # # ' . $ 6 2 % & 3 3 / # 3 % 4 5 ' ! 4 % 0 ( ! 3 % , ' ! 4 % 0 ' . $ 0 ' / / $ 6 & " # / - 0 # # # $ 0 ' . $ # # 2 # 2 2 % ! 2 % & " / / 4 3 3 3 ' . $ 3 / 5 4 2 2 # 2 2 2 2 # # $ $ 0 5 - 0 2 ! - v
STEVAL-ISQ009V1 schematic diagrams doc id 17166 rev 1 3/5 figure 2. motherboard circuit schematic
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revision history STEVAL-ISQ009V1 4/5 doc id 17166 rev 1 2 revision history table 1. document revision history date revision changes 22-feb-2010 1 initial release.
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