音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

TPS40055 Datasheet

  • TPS40055

  • 寬輸入 (8V-40V) 最高頻率 1MHz 的同步降壓控制器，具有輸出驅(qū)動...

  • 34頁

  • TI

掃碼查看芯片數(shù)據(jù)手冊

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

SLUS593B 鈭?DECEMBER 2003 鈭?REVISED APRIL 2004
TPS40054
TPS40055
TPS40057
DESIGN EXAMPLE
4. Calculate the power losses
Power losses in the high-side MOSFET (Si7860DP) at 24-V
IN
where switching losses dominate can be
calculated from equation (51).
I
RMS
+
I
O
d
+
8
0.135
+
2.93 A
(51)
substituting (34) into (33) yields
P
COND
+
2.93
2
0.008
(1
)
0.007
(150
*
25))
+
0.129 W
(52)
and from equation (33), the switching losses can be determined.
P
SW(fsw)
+
V
IN
I
O
t
SW
f
SW
+
24 V
8A
20 ns
300 kHz
+
1.152 W
(53)
The MOSFET junction temperature can be found by substituting equation (35) into equation (34)
T
J
+
P
COND
)
P
SW
q
JA
)
T
A
+
(0.129
)
1.152)
40
)
85
+
136 C
O
(54)
5. Calculate synchronous rectifier losses
The synchronous rectifier MOSFET has two (2) loss components, conduction, and diode reverse recovery
losses. The conduction losses are due to I
RMS
losses as well as body diode conduction losses during the dead
time associated with the anti-cross conduction delay.
The I
RMS
current through the synchronous rectifier from (38)
I
RMS
+
I
O
1
*
d
+
8
1
*
0.135
+
7.44 A
RMS
(55)
The synchronous MOSFET conduction loss from (33) is:
P
COND
+
I
RMS
2
R
DS(on)
+
7.44
2
0.008
(1
)
0.007(150
*
25))
+
0.83 W
(56)
The body diode conduction loss from (39) is:
P
DC
+
2
I
O
V
FD
t
DELAY
f
SW
+
2
8.0 A
0.8 V
100 ns
300 kHz
+
0.384 W
(57)
The body diode reverse recovery loss from (40) is:
P
RR
+
0.5
Q
RR
V
IN
f
SW
+
0.5
30 nC
24 V
300 kHz
+
0.108 W
(58)
The total power dissipated in the synchronous rectifier MOSFET from (41) is:
P
SR
+
P
RR
)
P
COND
)
P
DC
+
0.108
)
0.83
)
0.384
+
1.322 W
The junction temperature of the synchronous rectifier at 85擄C is:
T
J
+
P
SR
q
JA
)
T
A
+
(1.322)
40
)
85
+
139
o
C
(60)
(59)
In typical applications, paralleling the synchronous rectifier MOSFET with a Schottky rectifier increases the
overall converter efficiency by approximately 2% due to the lower power dissipation during the body diode
conduction and reverse recovery periods.
www.ti.com
27

TPS40055相關(guān)型號PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號推薦

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時間周一至周五
9:00-17:30

關(guān)注官方微信號，
第一時間獲取資訊。

建議反饋
返回頂部

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動力！意見一經(jīng)采納，將有感恩紅包奉上哦！