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參數(shù)資料
| 型號： | TPS40050PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大?。?/td> | 648K |
| 代理商： | TPS40050PWPRG4 |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
21
APPLICATION INFORMATION
TPS4005X POWER DISSIPATION
The power dissipation in the TPS4005x is largely dependent on the MOSFET driver currents and the input
voltage. The driver current is proportional to the total gate charge, Qg, of the external MOSFETs. Driver power
(neglecting external gate resistance, refer to [2] can be calculated from equation (40).
P
D + Qg
V
DR
f
SW
(Watts driver)
And the total power dissipation in the TPS4005x, assuming the same MOSFET is selected for both the high-side
and synchronous rectifier is described in equation (41).
P
T +
2
P
D
V
DR
) I
Q
V
IN
(Watts)
or
P
T + 2
Qg
f
SW ) IQ
V
IN
(Watts)
where:
D IQ is the quiescent operating current (neglecting drivers)
The maximum power capability of the device’s PowerPad package is dependent on the layout as well as air
flow. The thermal impedance from junction to air, assuming 2 oz. copper trace and thermal pad with solder and
no air flow.
q
JA + 36.515
O
C W
The maximum allowable package power dissipation is related to ambient temperature by equation (44).
P
T +
T
J * TA
q
JA
(Watts)
Substituting equation (37) into equation (35) and solving for fSW yields the maximum operating frequency for
the TPS4005x. The result is described in equation (45).
f
SW +
T
J*TA
q
JA
V
DD
* I
Q
2
Qg
(Hz)
(40)
(41)
(42)
(43)
(44)
(45)
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