lx1668 Microsemi Corporation, lx1668 Datasheet - Page 4

• Manufacturer Part Number: lx1668
• Description: Programmable Multiple Output Dc Dc Controller
• Manufacturer: Microsemi Corporation

LX1668
4
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.
* Nominal = DAC setpoint voltage with no adaptive output voltage positioning.
Table 1 - Adaptive Transient Voltage Output
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
P
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
ROGRAMMABLE
VID3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
P
Processor Pins
0 = Low, 1 = High
E L E C T R I C A L C H A R A C T E R I S T I C S
R O D U C T I O N
VID2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
M
U LTIPLE
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
O
VID0
UTPUT
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
D
A T A
DC:DC C
0.0A
1.34V
1.39V
1.44V
1.49V
1.54V
1.59V
1.64V
1.69V
1.74V
1.79V
1.84V
1.89V
1.94V
1.99V
2.04V
2.09V
2.04V
2.14V
2.24V
2.34V
2.44V
2.54V
2.64V
2.74V
2.84V
2.94V
3.04V
3.14V
3.24V
3.34V
3.44V
3.54V
(Output Voltage Setpoint — Typical)
Output Voltage (V
S
H E E T
Nominal Output* (V
ONTROLLER
1.30V
1.35V
1.40V
1.45V
1.50V
1.55V
1.60V
1.65V
1.70V
1.75V
1.80V
1.85V
1.90V
1.95V
2.00V
2.05V
2.00V
2.10V
2.20V
2.30V
2.40V
2.50V
2.60V
2.70V
2.80V
2.90V
3.00V
3.10V
3.20V
3.30V
3.40V
3.50V
SET
)
SET
)
Copyright © 1999
Rev. 1.0
4/99