參數(shù)資料
型號: TPS54260DGQR
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: GREEN, PLASTIC, MSOP-10
文件頁數(shù): 31/49頁
文件大小: 1808K
代理商: TPS54260DGQR
2
DS(on)
Vout
Pcon = Io
R
Vin
2
9
Psw = Vin
sw
lo
0.25
10-
9
Pgd = Vin
3
10
sw
-
6
Pq = 116
10
Vin
-
Ptot = Pcon + Psw + Pgd + Pq
TJ = TA + Rth
Ptot
TAmax = TJmax
Rth
Ptot
-
www.ti.com
SLVSA86A – MARCH 2010 – REVISED 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 (Pq).
(49)
(50)
(51)
(52)
Where:
IOUT is the output current (A).
RDS(on) is the on-resistance of the high-side MOSFET ().
VOUT is the output voltage (V).
VIN is the input voltage (V).
fsw is the switching frequency (Hz).
So
(53)
For given TA,
(54)
For given TJMAX = 150°C
(55)
Where:
Ptot is the total device power dissipation (W).
TA is the ambient temperature (°C).
TJ is the junction temperature (°C).
Rth is the thermal resistance of the package (°C/W).
TJMAX is maximum junction temperature (°C).
TAMAX is maximum ambient temperature (°C).
There will be additional power losses in the regulator circuit due to the inductor ac and dc losses, the catch diode
and trace resistance that will impact the overall efficiency of the regulator.
Copyright 2010, Texas Instruments Incorporated
37
Product Folder Link(s): TPS54260
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