LX1668 Ver la hoja de datos (PDF) - Microsemi Corporation
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LX1668 Datasheet PDF : 15 Pages
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PRODUCT DATABOOK 1996/1997
LX1668
P ROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
Table 1 - Adaptive Transient Voltage Output (Output Voltage Setpoint — Typical)
Processor Pins
0 = Low, 1 = High
Output Voltage (VSET)
VID4 VID3 VID2 VID1 VID0
0
1
1
1
1
0.0A
1.34V
Nominal Output* (VSET)
1.30V
0
1
1
1
0
1.39V
1.35V
0
1
1
0
1
1.44V
1.40V
0
1
1
0
0
1.49V
1.45V
0
1
0
1
1
1.54V
1.50V
0
1
0
1
0
1.59V
1.55V
0
1
0
0
1
1.64V
1.60V
0
1
0
0
0
1.69V
1.65V
0
0
1
1
1
1.74V
1.70V
0
0
1
1
0
1.79V
1.75V
0
0
1
0
1
1.84V
1.80V
0
0
1
0
0
1.89V
1.85V
0
0
0
1
1
1.94V
1.90V
0
0
0
1
0
1.99V
1.95V
0
0
0
0
1
2.04V
2.00V
0
0
0
0
0
2.09V
2.05V
1
1
1
1
1
2.04V
2.00V
1
1
1
1
0
2.14V
2.10V
1
1
1
0
1
2.24V
2.20V
1
1
1
0
0
2.34V
2.30V
1
1
0
1
1
2.44V
2.40V
1
1
0
1
0
2.54V
2.50V
1
1
0
0
1
2.64V
2.60V
1
1
0
0
0
2.74V
2.70V
1
0
1
1
1
2.84V
2.80V
1
0
1
1
0
2.94V
2.90V
1
0
1
0
1
3.04V
3.00V
1
0
1
0
0
3.14V
3.10V
1
0
0
1
1
3.24V
3.20V
1
0
0
1
0
3.34V
3.30V
1
0
0
0
1
3.44V
3.40V
1
0
0
0
0
3.54V
3.50V
* Nominal = DAC setpoint voltage with no adaptive output voltage positioning.
Note:
Adaptive Transient Voltage Output
In order to improve transient response a 40mV offset is built into the voltage comparator. At high currents, the
peak output voltage will be lower than the nominal set point , as shown in Figure 4. The actual output voltage
will be a function of the sense resistor, output current and output ripple.
4
Copyright © 1999
Rev. 1.0 4/99
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