1. A* candidate for the power supply Wiener MPOD-LV crate w/ remote control only (except for local on/off switch) Type “EC LV” Front or rear connections (reverse rack mount) With filter tray, front to rear airflow, stackable in rack, 9U high Control via 1-slot controller module (included), ethernet, USB, or canbus interface For test setup, simple Windows- USB software exists ethernet control via snmp protocol, command line tools exist for linux EPICS – snmp support exists (we use this at STAR) Crate power supply module (rear) (400VDC) is removeable. Would buy 1-2 spares. No spare crate needed. Also 1-2 spare controllers. Wiener MPOD-LV module 1 module needed per boardstack (see details next slide) 10 modules per crate 7 crates needed Total 63U rack space Total ~200k$ * I think this is a good solution (modulo evaluation test). But there may be other solutions we need to consider still.

2. Would use a variant of the standard MPV8016 module 8 channels, 15V at 5A New product (of which we would be the first real customer) allows paralleling channels for more current, internally in the module Each channel is a current-mode controlled switching converter, the parallelizable module allows a “master” channel error amp to drive slave channel current control This works for any load 0 – 100% and requires no balancing resistors (unlike some other paralleling schemes) We would use 3, 3, and 2 channels to get 15V at 15A, 15A, and 10A For a cable scheme (detailed at http://npvm.ceem.indiana.edu/~gvisser/BelleII/iTOP/cable_estimates.xlsx ) we would need http://npvm.ceem.indiana.edu/~gvisser/BelleII/iTOP/cable_estimates.xlsx Regulation VPS terminal voltageCurrent 2.3935.85514.5 3.6086.64112.7 4.8447.9435.6 That has plenty of margin with the module’s range. (Possible to consider 8V 10A module, but this would be very tight on voltage, may be trouble.) With one module per boardstack, we can terminate cable direct to the module, no patchpanel needed. Wiener is willing to change the connector for our purpose (it is wired to the board so change is relatively simple).

3. From table on previous slide, PS output power per boardstack is 213.7W Assume efficiency 70% (I think I measured it once on STAR SSD MPOD supplies; datasheet doesn’t say, we could inquire of course, but this is roughly about right figure) PS input AC power per boardstack is 305.3W PS input AC power per crate 3.05kW For 200VAC line voltage, input current 15.25A Within limits of normal PS box / cord (16A) Special option 32A input is available, but probably has to be hardwired? Higher input voltage is always desired, to reduce current in PFC switch device, lower temperature, improve reliability That statement is confirmed also from Wiener, and in STAR we have most power supplies taking more than 2kW input running from 208V