10.
Measure V
CORE
= 1.115 ~1.155V
11.
Open Jumper DPSLP#, measure V
CORE
= 1.064 ~ 1.104V
12.
Short Jumper DPRSLPVR, set VID jumpers for
deeper sleep mode operation
:
VID4 VID3 VID2 VID1 VID0
Open
Short
Open Short
Open
13.
Measure V
CORE
= 0.82~0.88V
14.
Short Jumper GMUXSEL, measure V
CORE
= 0.82~ 0.88V
Dynamic Load Transient Tests
1.
After the output voltage reaches the preset values, apply the load current equal to the
minimum load current of the load step test.
2.
Apply ±12V supplies to +12V, PGND and –12V pins. Then remove jumper JP11.
3.
Use the oscilloscope to test the output step currents from BNC connector “IO”.
Adjust potentiometers R44, R45 and R49 to vary the slew down slope, slew up slope
and step amplitudes (respectively) of the load current change.
4.
Measure the output voltage directly across Cap C15.
While doing the load transient tests, one should make sure that the input bench supply
should have sufficient decoupling capacitance. The following waveform is taken in
the performance mode: V
IN
= 21V, VID = 1.4V, GMUSEL = DPSLP# = 1,
DPRSLPVR = 0. The minimum load current is 8A, and the maximum load current is
23A. The minimum output voltage is 1.30V and the maximum output voltage is
1.39V.
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