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LTC3706_15 Datasheet, PDF (8/22 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability | |||
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LTC3706
BLOCK DIAGRAM
2Ã
IS+
16
+
32Ã
ISâ
â
15
2V
+
C
â
ITH
7
0.60V
FB
6
SLP
14
FS/SYNC
13
PHASE
5
MODE
4
+
C
â
+
EA
â
gm = 2.8mS
RUN/SS
DRIVE/DMAX
CONTROL
0.25V
+
C
â
2.5V
SLOPE
COMP 1
BLANK
OSC
AND DMAX
PLL
RUN/SS
8
FB
VCCUV
4VSB
SOFT-
START
SHDN
SSLOW
WAIT
UVLO
VSOUT
9
VS+
40k
10
VSâ
40k
11
4VSB OC
RESTRT1
OT
40k
+
VSENSE
AMP
â
40k
VCC
SHDN
UVLO
(4.25/4.5)
ITRP
WAIT
OVP
SKIP
BLANK
RESET
DOMINANT
R
Q
S
DMAX
PWM
+
OC
C
3.2V â
OVERCURRENT
VCC
VCC
WAIT
OVP
ZERO
CROSSING
DETECT VCC
DRIVER
ENCODING
AND
VCC
LOGIC
DRIVE
TYPE
FG
2
PGND
23
SG
1
0.2V
SW
20
PT+
22
PGND
PTâ
21
VINUV
REG
4VSB
4VSB
RQ
S
OT LATCH
4VSB
VCCUV
VREF
1.24V
60k
+
A
â
VIN
4V VCC
VIN
+
A
â
5VDC TO
30VDC
VIN
19
NDRV
18
SHDN
275k
gm = 5µS
VCC
24
5VDC TO
10VDC
REGSD
17
FB
OVP
PGOOD/OVP
0.6V
PGOOD
3
GND
12
3706 BD
â¢â¢
PULSE
XFMR
3706fd
8
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