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High Current Power Supply (HCDPS) 6 Device PowerSupply

System Reference, January 2001

173

e. Over-current Protection

There are two modes to be considered here:

I) Constant current mode: When the current limit is

reached, the HCDPS operates as a constant current

source. Note: Constant current mode is not possible

in ganged mode.

II) Clamp mode: When the current limit is reached,

the DPS switches to tristate.

For these modes, three different delay times (2ms,

6ms, and 8ms) can be programmed using the firm-

ware command HSCM (for details of this command

see the section, “Firmware Commands for the

HCDPS” on page 178 or the Command Reference

manual).

Note: When the DPS switches to tristate because of

having reached current limit, it does not pull down

the safety line

4. Balancing Circuits.

The 12 phase stepdown converter is organized in 6

pairs, phase-shifted by 180° to each other. Each pair

has its own shunt resistor to measure its output

current. All 6 current measurements are summed up

to a mean value. Regulators compare the mean value

with each of the 6 single currents and balance them to

be equal. If the current of one stage rises so much that

the balancing is never possible, a failure signal is

generated which:

a. Switches the HCDPS to tristate.

b. Creates a flag to be read by the software.

c. Switches also all HCPS to tristate which are

connected to the same safety_line.

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AWG G3 PAD FOR PS3 Spezifikationen Seite 173