lx1669 Microsemi Corporation, lx1669 Datasheet - Page 5

• Manufacturer Part Number: lx1669
• Description: Programmable Controller
• Manufacturer: Microsemi Corporation

Copyright © 1999
Rev. 1.0
VID[0:4]
PWRGD
OVP
4/99
100
95
90
85
80
75
70
10
4
5
6
7
8
9
1
V
2
REF
Power Good
Non-Synchronous Operation, V
& OVP
FIGURE 1 — Efficiency Test Results:
3
DAC
EFFICIENCY AT 3.1V
EFFICIENCY AT 2.8V
EFFICIENCY AT 1.8V
4
SS/ENABLE
5
V
SET
6
13
11
R
20k
SS
C
I
V
7
OUT
SS
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
CORE
60mV
P
(A)
40mV
8
R O G R A M M A B L E
12
Error Comp
CS Comp
9
V
FB
P
Hiccup
10
R O D U C T I O N
C H A R A C T E R I S T I C S C U R V E S
IN
= 5V
11
I
RESET
V
12
RESET
FIGURE 3 — Block Diagram
B L O C K D I A G R A M
Hiccup
13
Set
14
R
S
PWM
D C : D C C
Q
Q
Off-Time
Control
D
A T A
100
95
90
85
80
75
70
1
2
O N T R O L L E R
S
UVLO
H E E T
3
FIGURE 2 — Efficiency Test Results:
Synchronous Operation, V
EFFICIE NCY A T 3.1V
EFFICIE NCY A T 2.8V
EFFICIE NCY A T 1.8V
4
UVLO
5
6
I
7
OUT
(A)
8
15
16
14
2
1
3
V
TDRV
BDRV
PGND
AGND
V
+12V
+5V
CC12
CC5
9
IN
10
V
IN
= 5V
(5V)
11
L
LX1669
C
12
IN
R
13
C
SENSE
ESR
OUT
14
V
CORE
5