PRODUCT DATABOOK 1996/1997
LX1662/62A, LX1663/63A
S
INGLE
-C
HIP
P
ROGRAMMABLE
PWM C
ONTROLLERS WITH
5-B
IT
DAC
P
R O D U C T I O N
D
A T A
S
H E E T
CHARACTERISTICS CURVES
95
100
90
95
EFFICIENCY (%)
_
_
90
85
EFFICIENCY (%)
_
_
Output Set Point
85
80
80
Output Set Point
75
EFFICIENCY AT 3.1V
EFFICIENCY AT 2.8V
EFFICIENCY AT 1.8V
75
EFFICIENCY AT 3.1V
EFFICIENCY AT 2.8V
EFFICIENCY AT 1.8V
70
1
2
3
4
5
6
7
8
9
10
11
12
13
14
70
1
2
3
4
5
6
7
8
9
10
11
12
13
14
I
OUT
(A)
I
OUT
(A)
FIGURE 2
— Efficiency Test Results:
Non-Synchronous Operation, V
IN
= 5V
FIGURE 3
— Efficiency Test Results:
Synchronous Operation, V
IN
= 5V
90
85
80
75
70
Output Set Point
1.8V EFFICIENCY
65
2.8V EFFICIENCY
3.3V EFFICIENCY
60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
I
OUT
(A)
FIGURE 4
— Efficiency Test Results: Synchronous Operation, V
IN
= 12V.
Note: Non-synchronous operation not recommended for 12V operation, due to power loss in Schottky diode.
Copyright © 1999
Rev. 1.1 11/99
5
MICROSEMI [ MICROSEMI CORPORATION ]
