Datasheet LTC3722-1, LTC3722-2 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Synchronous Dual Mode Phase Modulated Full Bridge Controllers |
| Páginas / Página | 28 / 1 — FEATURES. DESCRIPTION. Adaptive or Manual Delay Control for Zero Voltage. … |
| Revisión | C |
| Formato / tamaño de archivo | PDF / 607 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Adaptive or Manual Delay Control for Zero Voltage. Switching Operation
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LTC3722-1/LTC3722-2 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
FEATURES DESCRIPTION
n
Adaptive or Manual Delay Control for Zero Voltage
The LTC®3722-1/LTC3722-2 phase-shift PWM controllers
Switching Operation
provide all of the control and protection functions neces- n
Adjustable Synchronous Rectification Timing for
sary to implement a high efficiency, zero voltage switched
Highest Efficiency
(ZVS), full bridge power converter. Adaptive ZVS circuitry n
Adjustable Maximum ZVS Delay
delays the turn-on signals for each MOSFET independent n
Adjustable System Undervoltage Lockout Hysteresis
of internal and external component tolerances. Manual n Programmable Leading Edge Blanking delay set mode enables secondary side control operation n Very Low Start-Up and Quiescent Currents or direct control of switch turn-on delays. n Current Mode (LTC3722-1) or Voltage Mode The LTC3722-1/LTC3722-2 feature adjustable synchron- (LTC3722-2) Operation ous rectifier timing for optimal efficiency. A UVLO program n Programmable Slope Compensation input provides accurate system turn-on and turn-off n VCC UVLO and 25mA Shunt Regulator voltages. The LTC3722-1 features peak current mode n 50mA Output Drivers control with programmable slope compensation and n Soft-Start, Cycle-by-Cycle Current Limiting and leading edge blanking, while the LTC3722-2 employs Hiccup Mode Short-Circuit Protection voltage mode control. n 5V, 15mA Low Dropout Regulator n 24-Pin Surface Mount GN Package The LTC3722-1/LTC3722-2 feature extremely low operating and start-up currents. Both devices include a full range of
APPLICATIONS
protection features and are available in the 24-pin surface mount GN package. n Telecommunications, Infrastructure Power Systems All registered trademarks and trademarks are the property of their respective owners. n Distributed Power Architectures n Server Power Supplies
TYPICAL APPLICATION
VIN 36V TO CIN R1 72V
12VOUT, 240W Converter Efficiency
U1 U2 MA MC 95 T1 36VIN L1 LTC3722 VOUT 90 12V L2 48VIN 72VIN MB MD COUT 85 EFFICIENCY (%) RCS ME 80 T2 C1 U3 75 MF 0 2 4 6 8 10 12 14 16 18 20 CURRENT (A) 372212 TA01b U1, U2: LTC4440 GATE DRIVER U3: LTC3901 GATE DRIVER 372212 TA01a Rev C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagram Operation Revision History Typical application Related Parts
FEATURES DESCRIPTION
n
Adaptive or Manual Delay Control for Zero Voltage
The LTC®3722-1/LTC3722-2 phase-shift PWM controllers
Switching Operation
provide all of the control and protection functions neces- n
Adjustable Synchronous Rectification Timing for
sary to implement a high efficiency, zero voltage switched
Highest Efficiency
(ZVS), full bridge power converter. Adaptive ZVS circuitry n
Adjustable Maximum ZVS Delay
delays the turn-on signals for each MOSFET independent n
Adjustable System Undervoltage Lockout Hysteresis
of internal and external component tolerances. Manual n Programmable Leading Edge Blanking delay set mode enables secondary side control operation n Very Low Start-Up and Quiescent Currents or direct control of switch turn-on delays. n Current Mode (LTC3722-1) or Voltage Mode The LTC3722-1/LTC3722-2 feature adjustable synchron- (LTC3722-2) Operation ous rectifier timing for optimal efficiency. A UVLO program n Programmable Slope Compensation input provides accurate system turn-on and turn-off n VCC UVLO and 25mA Shunt Regulator voltages. The LTC3722-1 features peak current mode n 50mA Output Drivers control with programmable slope compensation and n Soft-Start, Cycle-by-Cycle Current Limiting and leading edge blanking, while the LTC3722-2 employs Hiccup Mode Short-Circuit Protection voltage mode control. n 5V, 15mA Low Dropout Regulator n 24-Pin Surface Mount GN Package The LTC3722-1/LTC3722-2 feature extremely low operating and start-up currents. Both devices include a full range of
APPLICATIONS
protection features and are available in the 24-pin surface mount GN package. n Telecommunications, Infrastructure Power Systems All registered trademarks and trademarks are the property of their respective owners. n Distributed Power Architectures n Server Power Supplies
TYPICAL APPLICATION
VIN 36V TO CIN R1 72V
12VOUT, 240W Converter Efficiency
U1 U2 MA MC 95 T1 36VIN L1 LTC3722 VOUT 90 12V L2 48VIN 72VIN MB MD COUT 85 EFFICIENCY (%) RCS ME 80 T2 C1 U3 75 MF 0 2 4 6 8 10 12 14 16 18 20 CURRENT (A) 372212 TA01b U1, U2: LTC4440 GATE DRIVER U3: LTC3901 GATE DRIVER 372212 TA01a Rev C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagram Operation Revision History Typical application Related Parts