參數(shù)資料
型號(hào)： TPS5401DGQT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： PLASTIC, MSOP-10
文件頁數(shù)： 27/41頁
文件大?。?/td> 1149K
代理商： TPS5401DGQT
2
OUT
con
OUT
DS(on)
IN
V
P
= I
r
V
2
9
sw
IN
OUT
SW
P
= V
l
0.25
10
f
-
9
GD
IN
SW
P
= V
3
10
f
-
6
SUP
IN
P
= 116
10
V
-
TOT
CON
SW
GD
SUP
P
= P
+ P
J
A
JA
TOT
T
P
q
=
-
A(max)
J(max)
JA
TOT
T
P
q
=
-
www.ti.com
SLVSAB0 – DECEMBER 2010
Power Dissipation Estimate
The following formulas show how to estimate the IC power dissipation under continuous-conduction mode (CCM)
operation. These equations should not be used if the device is working in discontinuous-conduction mode
(DCM).
The power dissipation of the IC includes conduction loss (Pcon), switching loss (Psw), gate-drive loss (PGD), and
supply current (PSUP).
(36)
(37)
(38)
(39)
So total power dissipation is:
(40)
For a given ambient temperature TA, the junction temperature TJ can be estimated by Equation 41.
(41)
where:
qJA is the thermal resistance of the package (°C/W)
For given TJ(max) = 150°C, the maximum allowed ambient temperature can be estimated by Equation 42.
(42)
There are additional power losses in the regulator circuit due to the inductor ac and dc losses, the catch diode
and trace resistance that impact the overall efficiency of the regulator.
Copyright 2010, Texas Instruments Incorporated
33
Product Folder Link(s): TPS5401
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