LTC3723-1/LTC3723-2
Synchronous Push-Pull
PWM Controllers
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DESCRIPTIO
FEATURES
TheLTC®3723-1/LTC3723-2synchronouspush-pullPWM
controllers provide all of the control and protection func-
tions necessary for compact and highly efficient, isolated
power converters. High integration minimizes external
component count, while preserving design flexibility.
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High Efficiency Synchronous Push-Pull PWM
■
1.5A Sink, 1A Source Output Drivers
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Supports Push-Pull, Full-Bridge, Half-Bridge, and
Forward Topologies
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Adjustable Push-Pull Dead-Time and Synchronous
Timing
The robust push-pull output stages switch at half the
oscillator frequency. Dead-time is independently pro-
grammed with an external resistor. Synchronous rectifier
timing is adjustable to optimize efficiency. A UVLO pro-
gram input provides precise system turn-on and turn off
voltages. The LTC3723-1 features peak current mode
controlwithprogrammableslopecompensationandlead-
ing edge blanking, while the LTC3723-2 employs voltage
mode control with voltage feedforward capability.
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Adjustable System Undervoltage Lockout and
Hysteresis
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Adjustable Leading Edge Blanking
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Low Start-Up and Quiescent Currents
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Current Mode (LTC3723-1) or Voltage Mode
(LTC3723-2) Operation
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Single Resistor Slope Compensation
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VCC UVLO and 25mA Shunt Regulator
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Programmable Fixed Frequency Operation to 1MHz
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50mA Synchronous Output Drivers
The LTC3723-1/LTC3723-2 feature extremely low operat-
ing and start-up currents. Both devices provide reliable
short-circuit and overtemperature protection. The
LTC3723-1/LTC3723-2 are offered in a 16-pin SSOP
package.
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Soft-Start, Cycle-by-Cycle Current Limiting and
Hiccup Mode Short-Circuit Protection
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5V, 15mA Low Dropout Regulator
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Available in 16-Pin SSOP Package
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, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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Telecommunications, Infrastructure Power Systems
Distributed Power Architectures
■
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TYPICAL APPLICATIO
Isolated Push-Pull Converter
V
OUT
V
IN
ME
UVLO
SPRG
DRVA
SYNC
FROM
AUXILIARY
WINDING
•
•
LTC3901
DRVB
CS
V
CC
MF
V
REF
DPRG
C
SDRA
SDRB
T
V
V
REF
OUT
R
LEB
V
REF
+
V
LTC3723-1
COMP
FB GND
COLL
R
REF
V
OUT
LT1431
SS
GND-F GND-S
372312 TA01
372312f
1