参数资料
型号: LTC3722IGN-2#PBF
厂商: Linear Technology
文件页数: 10/28页
文件大小: 0K
描述: IC REG CTRLR DIV ISO PWM 24SSOP
标准包装: 55
PWM 型: 电压模式,全桥
输出数: 1
频率 - 最大: 1MHz
占空比: 98.5%
电源电压: 3.8 V ~ 10.3 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
包装: 管件
LTC3722-1/LTC3722-2
TIMING DIAGRAM
PASSIVE LEG
DELAY
ACTIVE LEG
DELAY
OUTA
OUTB
OUTC
OUTD
COMP
RAMP
COMP
COMP
OUTE
OUTF
NOTE: SHADED AREAS CORRESPOND TO POWER DELIVERY PULSES.
OPERATION
SYNC TURN OFF
DELAY (PROGRAMMABLE)
SYNC TURN OFF
DELAY (PROGRAMMABLE)
372212 TD01
Phase-Shift Full Bridge PWM
Conventional full bridge switching power supply topologies
are often employed for high power, isolated DC/DC and
off-line converters. Although they require two additional
switching elements, substantially greater power and higher
efficiency can be attained for a given transformer size
compared to the more common single-ended forward and
flyback converters. These improvements are realized since
the full bridge converter delivers power during both parts
of the switching cycle, reducing transformer core loss
and lowering voltage and current stresses. The full bridge
converter also provides inherent automatic transformer
flux reset and balancing due to its bidirectional drive
configuration. As a result, the maximum duty cycle range
is extended, further improving efficiency. Soft-switching
variations on the full bridge topology have been proposed
to improve and extend its performance and application.
These zero voltage switching (ZVS) techniques exploit the
generally undesirable parasitic elements present within the
power stage. The parasitic elements are utilized to drive
near lossless switching transitions for all of the external
power MOSFETs.
LTC3722-1/LTC3722-2 phase-shift PWM controllers pro-
vide enhanced performance and simplify the design task
required for a ZVS phase-shifted full bridge converter.
The primary attributes of the LTC3722-1/LTC3722-2 as
compared to currently available solutions include:
1. Truly adaptive and accurate (DirectSense TM technology)
ZVS with programmable timeout.
Benefit: higher efficiency, higher duty cycle capability,
eliminates external trim.
2. Fixed ZVS capability.
Benefit: enables secondary-side control and simplifies
external circuit.
372212fb
10
For more information www.linear.com/LTC3722
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