PRODUCT DATABOOK 1996/1997
LX1664/64A, LX1665/65A
D
UAL
O
UTPUT
PWM C
ONTROLLERS
P
R O D U C T I O N
WITH
5-B
IT
DAC
D
A T A
S
H E E T
BLOCK DIAGRAM
V
CC
SS
1
2V Out
UVLO
10.6/10.1
Trimmed
2V REF
Internal
V
CC
R DOM
V
REG
Break
Before
Make
Error Comp
0.7V
SYNC EN
Comp
PWM Latch
S
R
Q
18
V
C1
17
TDRV
Q
16
GND
40mV
15
BDRV
INV
2
Off-Time
Controller
14
V
CC
V
CC_CORE
3
100mV
**
CS Comp
OV Comp
C
T
13
UV Comp
12
OV*
10
PWRGD*
10k
DAC OUT
LX1665/1665A ONLY
1.5V
Linear Op Amp
11
L
DRV
9
L
FB
4
5
6
7
8
DAC
VID0
VID1
VID2
VID3
VID4
Note: Pin numbers are correct for LX1665/1665A, 18-pin package.
* Not connected on LX1664/1664A.
** 60mV in LX1664A/1665A.
FIGURE 5
— LX1664/1665 Block Diagram
6
Copyright © 1999
Rev. 1.2 11/99