LX1664/64A, LX1665/65A

PRODUCT DA T ABOOK 1996/1997

Copyright © 1999

Rev. 1.2 11/99

4

ELECTRICAL CHARACTERISTICS

Time - 100µs/Div.

FIGURE 1 — Output Transient Response

(using 5m

Ω sense resistor and 5µH output inductor)

Note:

Adaptive Transient Voltage Output

In order to improve transient response a 40mV

offset is built into the Current Sense comparator.

At high currents, the peak output voltage will be

lower than the nominal set point, as shown in

Figure 1. The actual output voltage will be a

function of the sense resistor, the output current

and output ripple.

01111

1.34V

1.30V

01110

1.39V

1.35V

01101

1.44V

1.40V

01100

1.49V

1.45V

01011

1.54V

1.50V

01010

1.59V

1.55V

01001

1.64V

1.60V

01000

1.69V

1.65V

00111

1.74V

1.70V

00110

1.79V

1.75V

00101

1.84V

1.80V

00100

1.89V

1.85V

00011

1.94V

1.90V

00010

1.99V

1.95V

00001

2.04V

2.00V

00000

2.09V

2.05V

11111

2.04V

2.00V

11110

2.14V

2.10V

11101

2.24V

2.20V

11100

2.34V

2.30V

11011

2.44V

2.40V

11010

2.54V

2.50V

11001

2.64V

2.60V

11000

2.74V

2.70V

10111

2.84V

2.80V

10110

2.94V

2.90V

10101

3.04V

3.00V

10100

3.14V

3.10V

10011

3.24V

3.20V

10010

3.34V

3.30V

10001

3.44V

3.40V

10000

3.54V

3.50V

VID4

VID3

VID2

VID1

VID0

Processor Pins

Output Voltage (V

0 = Ground, 1 = Open (Floating)

0.0A

Nominal Output*

* Nominal = DAC setpoint voltage with no adaptive output voltage positioning.