DC1123 QUICK START GUIDE 2
output voltages adjusted through I
2
C control from
600mv to 3.775V in 25mv increments.
Using short tw isted pair leads for any power connec-
tions and w ith all loads and power supplies off, refer
to Figure 1 for the proper measurement and equip-
ment setup.
NOTE.
W hen measuring the input or output voltage ripple, care must be
taken to avoid a long ground lead on the oscilloscope probe. Measure the
input or output voltage ripple by touching the probe tip directly across the
VCC or VOU T and GND terminals. See Figure 2 for proper scope probe
technique.
1.
Place jumpers and load settings in the following posi-
tions:
JP1 (RUN600A)
= ON
JP2 (RUN400A)
= ON
Load 1
= Consant Current 50mA
Load 2
= Constant Current 50mA
Load 3
= Constant Current 50mA
Load 4
= Constant Current 50mA
2.
Connect Pow er S upply PS1 to VIN terminals and ad-
just to 4.5 Volts to the demo board, as shown in Fig-
ure 1.
3.
Verify that OUT600A (1.8V) and OUT400A (1.5V) are
operational with proper output voltages.
4.
Once the proper output voltages are established, ad-
just the loads w ithin the operating range and observe
the output voltage regulation, ripple voltage, and effi-
ciency.
5.
Open the Quickstart S oftware as discribed in the
DC590 Quick Start Guide
6.
Set Jumpers JP1 (RU N400A) and JP2 (RU N600A) to
Off Position. Connect Ribbon cable from DC590 demo
circuit to J2. The LTC 3562 demonstation software
should pop-up automatically w hen the cable is in-
stalled.
7.
Using the LTC3562 software GU I. See Figure 3. Set all
modes to Burst mode, V OU T 600A to 1.82V, VOU T
600B to 3.3V, VO UT 400A to 1.51V and V OUT 400B to
1.2V. Set all loads to 50mA. Check Auto U pdate but-
tons. Click on Enable All button.
8.
Once the proper output voltages are established, ad-
just the loads w ithin the operating range and observe
the output voltage regulation, ripple voltage, and effi-
ciency.
9.
Using the LTC3562 software GU I. Set all modes to
Pulse Skip mode, VOU T 600A to 1.82V, VO UT 600B to
3.3V, VO UT 400A to 1.51V and VO UT 400B to 1.2V.
Set all loads to 50mA.
10.
Once the proper output voltages are established, ad-
just the loads w ithin the operating range and observe
the output voltage regulation, ripple voltage, and effi-
ciency.
11.
Using the LTC3562 software GU I. Set all modes to
Forced Burst mode, VOU T 600A to 1.82V, VO UT 600B
to 3.3V, VOU T 400A to 1.51V and VO UT 400B to 1.2V .
Set all loads to 50mA.
12.
Once the proper output voltages are established, ad-
just the loads w ithin the operating range and observe
the output voltage regulation, ripple voltage, and effi-
ciency
13.
Using the LTC3562 software GU I. Set all modes to
LDO mode, VO UT 600A to 1.82V , VOU T 600B to 3.3V,
VOU T 400A to 1.51V and V OUT 400B to 1.2V . Set all
loads to 50mA.
14.
Once the proper output voltages are established, ad-
just the loads w ithin the operating range and observe
the output voltage regulation, ripple voltage, and effi-
ciency
15.
Using the LTC3562 software GU I. Set all modes to
Burst mode, VOU T 600A to 1.82V, VO UT 600B to
3.3V, VO UT 400A to 1.51V and VO UT 400B to 1.2V.
Set all loads to 50mA.
16.
M onitor P OR600A pin while increasing Load1 until
the signal on POR 600A goes low . The voltage on
P600A w ill be less than 92% of voltage setting.