參數(shù)資料
型號: TPS28225DT
廠商: Texas Instruments, Inc.
英文描述: High-Frequency 4-A Sink Synchronous MOSFET Driver
中文描述: 高頻率的4 - A水槽同步MOSFET驅(qū)動器
文件頁數(shù): 24/30頁
文件大?。?/td> 951K
代理商: TPS28225DT
www.ti.com
TI: 700kHz
Ind: 700kHz
5
10
15
25
35
75
90
20
30
80
85
E
C
L
Load Currnt A
TI: 800kHz
Ind: 800kHz
5
10
15
25
35
75
90
20
30
80
85
E
C
L
Load Currnt A
400
500
700
800
0.0
1.5
2.0
600
0.5
1.0
DRIVE LOSS
vs
SWITCHING FREQUENCY
F
SW
Switching Frequency
kHz
12V
Estimation
SOIC8
Package
Limit at 45
°
C
8V
TPS28225
5V
Ind. Std.
D
L
TPS28225
SLUS710–MAY 2006
EFFICIENCY
vs
LOAD CURRENT
EFFICIENCY
vs
LOAD CURRENT
Figure 34.
Figure 35.
When using the same power stage, the driver with the optimal drive voltage and optimal dead time can boost
efficiency up to 5%. The optimal 8-V drive voltage versus 5-V drive contributes 2% to 3% efficiency increase and
the remaining 1% to 2% can be attributed to the reduced dead time. The 7-V to 8-V drive voltage is optimal for
operation at switching frequency range above 400kHz and can be illustrated by observing typical R
DS(on)
curves
of modern FETs as a function of their gate drive voltage. This is shown in
Figure 36
.
Figure 36. R
DS(on)
of MOSFET as Function of V
GS
Figure 37. Drive Power as Function of V
GS
and F
SW
24
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