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LTC3725EMSE Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3725EMSE
Description  Single-Switch Forward Controller and Gate Driver
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3725EMSE Datasheet(HTML) 6 Page - Linear Technology

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LTC3725
6
3725f
PI FU CTIO S
UVLO (Pin 1): Undervoltage Lockout. Connect to a resis-
tive voltage divider to monitor input voltage VIN. Enables
converter operation for VUVLO > 1.242V. Hysteresis is a
fixed 16mV hysteresis voltage with a 4.9
µA hysteresis
current that combines with the Thevenin resistance of the
divider to set the total UVLO hysteresis voltage. This input
also senses VIN for voltage feedforward. Finally, this pin
can be used for external run/stop control.
SSFLT (Pin 2): Combination Soft-Start and Fault Indica-
tor. A capacitor to GND sets the duty cycle ramp-up rate
during start-up. To indicate a fault, the SSFLT pin is
momentarily pulled up to within 1.3V of VCC.
NDRV (Pin 3): Drive for the External NMOS Linear Regu-
lator. Connect to the gate of the NMOS and connect a pull
up resistor to the input voltage (VIN). Optionally, to create
a trickle charger omit the NMOS device and connect NDRV
to VCC.
FB/IN+ (Pin 4): This pin has several functions. One wind-
ing of a pulse transformer is connected to the FB/IN+ and
FS/INpins. The other pulse transformer winding is con-
nected to the LTC3706. The LTC3725 automatically de-
tects when the LTC3706 applies a pulse-encoded signal to
the FB/IN+ and FS/INpins and decodes duty cycle infor-
mation for control of the primary-side gate drive (see
Operation below). In secondary-side control, primary-
side gate drive bias power is also extracted from the FB/IN+
and FS/INpins using an on-chip full-wave rectifier.
For primary-side control connect this pin to an optoisolator
for feedback control of converter output voltage using an
internal optoisolator biasing network.
FS/IN(Pin 5): This pin has several functions. Place a
resistor from this pin to GND to set the oscillator fre-
quency. For secondary-side control with the LTC3706,
connect one winding of the pulse transformer for opera-
tion as described for the FB/IN+ pin above.
PGND (Pin 6): Supply Return for the Bottom Gate Driver
and the On-Chip Bridge Rectifier.
GATE (Pin 7): Gate Drive. Connect to the gate of the
external MOSFET.
VCC (Pin 8): Main VCC Power for All Driver and Control
Circuitry.
VSLMT (Pin 9): Volt-Second Limit. Form an R-C integrator
by connecting a resistor from VIN to VSLMT and a capacitor
from VSLMT to ground. The gate drive is turned off when
the voltage on the VSLMT pin exceeds 1.26V.
IS (Pin 10): Input to the Overcurrent Comparator. Connect
to the positive terminal of a current-sense resistor in
series with the source of the ground-referenced bottom
MOSFET.
GND (Pin 11): Signal Ground.


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