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| 型号： | TPS40052PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 10/33页 |
| 文件大小： | 753K |
| 代理商： | TPS40052PWP |
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TPS40052
SLUS563C AUGUST 2003 REVISED FEBRUARY 2005
18
www.ti.com
APPLICATION INFORMATION
UDG02139
I
ANTICROSS
CONDUCTION
SYNCHRONOUS
RECTIFIER ON
BODY DIODE
CONDUCTION
BODY DIODE
CONDUCTION
HIGH SIDE ON
ID1
ID2
IO
SW
0
}
d
1d
Figure 8. Inductor Current and SW Node Waveforms
The maximum allowable power dissipation in the MOSFET is determined by equation (30).
P
T +
T
J * TA
q
JA
(Watts)
where:
P
T + PCOND ) PSW(fsw)
(Watts)
and
θJA is the package thermal impedance.
Synchronous Rectifier MOSFET Power Dissipation
The power dissipated in the synchronous rectifier MOSFET is comprised of three components: RDS(on)
conduction losses, body diode conduction losses, and reverse recovery losses. RDS(on) conduction losses can
be found using equation (27) and the RMS current through the synchronous rectifier MOSFET is described in
equation (32).
I
RMS + IO
1
* d
Amperes
RMS
The body-diode conduction losses are due to forward conduction of the body diode during the anticross
conduction delay time. The body diode conduction losses are described by equation (33).
P
DC + 2
I
O
V
F
t
DELAY
f
SW
(Watts)
where:
D VF is the body diode forward voltage
D tDELAY is the total delay time just before the SW node rises.
(30)
(31)
(32)
(33)
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