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LT3752 Datasheet(PDF) 12 Page - Linear Technology

Part # LT3752
Description  Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters
PDF  48 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3752 Datasheet(HTML) 12 Page - Linear Technology

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LT8311
12
8311f
For more information www.linear.com/LT8311
BLOCK DIAGRAM
MOSFET to perform VDS current sensing. Alternatively, if
a more precise current sensing mechanism is desired, the
pins may be connected across a sense resistor at the catch
MOSFET’s source. The current comparator trips at 62mV
typical. The CSP pin sources 38µA current, allowing trip
voltages less than 62mV to be set by placing a resistor in
series with the CSP pin. It is recommended to place an
identical resistor in series with the CSN pin to match any
voltage offsets created by the input bias current (100nA)
of the current comparator. In preactive mode, the CSP and
CSN pins must be configured to trip at zero or positive
values of source to drain current in the catch MOSFET
(current in catch MOSFET cannot be allowed to flow from
drain to source in preactive mode).
GND (Exposed Pad Pin 21): Ground. Exposed pad must
be soldered directly to local ground plane.
PIN FUNCTIONS
8311 BD
INTVCC
INTVCC
VIN
VIN UVLO
CRST
COMP
1.227V
VIN
1V
10µA
1.2V
OPTO
1.227V
RCSW
SSDOWNAMP
SYNCHRONOUS
CONTROLLER
0.9V
•
•
RE
NS
NP
TO PRIMARY-
SIDE CIRCUITS
MFG
VIN(SYS)
PRIMARY
SIDE
SECONDARY
SIDE
PRIMARY
IC
MCG
–
+
1.2V
1.2V
1.31V
1.14V
+
–
+
–
+
–
–
+
+
+
–
+
–
+
–
+
–
+
–
SWITCHING TIMEOUT
OSCILLATOR
UVLO + 1.227
REFERENCE
UVLO/
OVLO
+
–
+
–
10
SS
14
CSS
140k
RD
2k
100mV
62mV
38µA
300k
RCSN
RCSP
RFSW
M1
9
PMODE
8
CSN
18
CG
16
CSP
20
FG
5
FSW
3
CSW
1
20k
6
INTVCC
CINTVCC
7
VIN
12
TIMER
15
SYNC
7V
11
FB
13
PGOOD
21
GND
RTIMER
RPGOOD
RFB1
CVIN
COUT
VOUT
CPL
VIN
5.7V
5.7V
RFB2
CC
RC
CF
20k
LOUT
A2
S1
A1
SYNCHRONOUS
MODE SELECT
600mV
+
–
+–



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