lt1725cs-trpbf Linear Technology Corporation, lt1725cs-trpbf Datasheet - Page 7

• Manufacturer Part Number: lt1725cs-trpbf
• Description: General Purpose Isolated Flyback Controller
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
ENDLY (Pin 13): Pin for external programming resistor to
set enable delay time. See Applications Information for
details.
t
switch minimum on time. See Applications Information
for details.
BLOCK DIAGRA
ON
U
(Pin 14): Pin for external programming resistor to set
U
OSCAP
UVLO
FB
U
W
BIAS
FDBK
OSC
V
CC
3V
3V REG
(INTERNAL)
OUT
t
ON
V
C
MINENAB
LOGIC
SOFT-START
ENDLY
SFST
V
pin to ground with 1µF or more.
GATE (Pin 16): This is the gate drive to the external power
MOSFET switch and has large dynamic currents flowing
through it. Keep the trace to the MOSFET as short as
possible to minimize electromagnetic radiation and volt-
age spikes. A series resistance of 5Ω or more may help to
dampen ringing in less than ideal layouts.
CC
(Pin 15): Supply voltage for the LT1725. Bypass this
COMP
MOSFET
DRIVER
COMPENSATION
R
PGND
OCMP
LOAD
R
I
AMP
CMPC
1725 BD
I
SGND
GATE
SENSE
LT1725
1725fa
7