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Power Supply Operation
TM-XDOP-01XN 3–49
Slew Rate
The slew rate is calculated as a function of change in the output voltage and a
given time interval. The maximum slew rate is 1% rated voltage/150us. The slew
rate is saved upon power off and restored at power on. Output ON/OFF and
shutdown are not affected by the programmable slew rate. These functions have a
slew rate of 1%/20ms.
The range of output voltage is 5% - 0.1% of rated voltage.
The range of time interval is 1.5 s - 150 us.
The negative slew rate is limited by the discharge rate of the output capacitors.
During current share, slaves operate with their default slew rate. The master
operates at its programmed slew rate. Hence a programmable slew rate for the
system is achieved. However, this slew rate is limited by the speed of the control
loop. The slaves will return to their programmed slew rate when they exit current
share slave operation.
The slew rate error increases as the slew rate increases.
Selecting SLEW RATE from the main menu will give you two choices:
Voltage slew - adjust the voltage slew rate
Voltage default - restore the default voltage slew rate
Selecting VOLTAGE DEFAULT will return the slew rate to the default value of
1% rated voltage per 150us.
To set the slew rate:
Step # Do This You Will See
1ERROR MSGS
2 Use the scroll keys to get the SLEW RATE menu. SLEW RATE
3
Voltage slew
4 dV: 0.100 V
5 Enter the desired voltage step. Allowable range is
0.1% to 5% rated voltage.
dV: 1.000 V
6 dt: 150 us
7 Enter the time interval. The range is 150 us to 1.5 s. dt: 1000 us
8
MENU
ENTER
ENTER
ENTER
ENTER
TM-XDOP-01XN.book Page 49 Monday, July 17, 2006 11:19 AM