參數(shù)資料
型號(hào): LTC1922-1
廠商: Linear Technology Corporation
英文描述: Synchronous Dual Mode Phase Modulated Full Bridge Controllers
中文描述: 同步相位調(diào)制的雙模式全橋控制器
文件頁(yè)數(shù): 25/28頁(yè)
文件大?。?/td> 319K
代理商: LTC1922-1
LTC3722-1/LTC3722-2
25
372212i
Current Doubler
The current doubler secondary employs two output induc-
tors that equally share the output load current. The trans-
former secondary is not center-tapped. This configuration
provides 2x higher output current capability compared to
similarly sized single output inductor modules, hence the
name. Each output inductor is twice the inductance value
as the equivalent single inductor configuration and the
transformer turns ratio is 1/2 that of a single inductor
secondary. The drive to the inductors is 180 degrees out
of phase which provides partial ripple current cancellation
in the output capacitor(s). Reduced capacitor ripple cur-
rent lowers output voltage ripple and enhances the
1
0
0
0.25
DUTY CYCLE
0.5
NORMALIZED
OUTPUT RIPPLE
CURRENT
ATTENUATION
1922 F13
NOTE:
INDUCTOR(S) DUTY CYCLE
IS LIMITED TO 50% WITH CURRENT
DOUBLER PHASE SHIFT CONTROL.
Figure 15. Ripple Current Cancellation vs Duty Cycle
OPERATIOU
capacitors’s reliability. The amount of ripple cancellation
is related to duty cycle (see Figure 15). Although the
current doubler requires an additional inductor, the induc-
tor core volume is proportional to LI
2
, thus the size penalty
is small. The transformer construction is simplified with-
out a center-tap winding and the turns ratio is reduced by
1/2 compared to a conventional full wave rectifier configu-
ration.
Synchronous rectification of the current doubler second-
ary requires two ground referenced N-channel MOSFETs.
The timing of the LTC3722-1/LTC3722-2 drive signals is
shown in the Timing Diagram.
相關(guān)PDF資料
PDF描述
LTC1696 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
LTC3722-2 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
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