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參數(shù)資料
| 型號： | TPS40055QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大小： | 571K |
| 代理商： | TPS40055QPWPRQ1 |
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UDG02139
I
ANTICROSS
CONDUCTION
SYNCHRONOUS
RECTIFIER ON
BODY DIODE
CONDUCTION
BODY DIODE
CONDUCTION
HIGH SIDE ON
ID1
ID2
IO
SW
0
}
d
1d
P
T +
T
J * TA
q
JA
(Watts)
(34)
P
T + PCOND ) PSW(fsw)
(Watts)
(35)
SYNCHRONOUS RECTIFIER MOSFET POWER DISSIPATION
I
RMS + IO
1 * d
Amperes
RMS
(36)
P
DC + 2
I
O
V
F
t
DELAY
f
SW
(Watts)
(37)
P
RR + 0.5
Q
RR
V
IN
f
SW
(Watts)
(38)
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
APPLICATION INFORMATION (continued)
Figure 15. Inductor Current and SW Node Waveforms
The maximum allowable power dissipation in the MOSFET is determined by Equation 34.
where:
and
θJA is the package thermal impedance.
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 31 and the RMS current through the synchronous rectifier MOSFET is described in Equation 36.
The body-diode conduction losses are due to forward conduction of the body diode during the anti-cross
conduction delay time. The body diode conduction losses are described by Equation 37.
where:
VF is the body diode forward voltage
tDELAY is the delay time just before the SW node rises
The 2-multiplier is used because the body diode conducts twice during each cycle (once on the rising edge and
once on the falling edge). The reverse recovery losses are due to the time it takes for the body diode to recovery
from a forward bias to a reverse blocking state. The reverse recovery losses are described in Equation 38.
where:
QRR is the reverse recovery charge of the body diode
The QRR is not always described in a MOSFET's data sheet, but may be obtained from the MOSFET vendor.
The total synchronous rectifier MOSFET power dissipation is described in Equation 39.
20
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