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参数资料
| 型号： | TPS40077PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 14/43页 |
| 文件大小： | 847K |
| 代理商： | TPS40077PWPRG4 |
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INTERNAL REGULATORS
TPS40077 POWER DISSIPATION
P
T +
2
P
D
V
DR
) IQ
V
IN
(Watts)
(14)
P
T + 2
Qg
f
SW ) IQ
V
IN
(Watts)
(15)
P
T +
T
J * TA
qJA
(Watts)
(16)
www.ti.com ..................................................................................................................................................... SLUS714D – JANUARY 2007 – REVISED APRIL 2009
The internal regulators are linear regulators that provide controlled voltages from which the drivers and the
internal circuitry operate. The DBP pin is connected to a nominal 8-V regulator that provides power for the driver
circuits. This regulator has two modes of operation. At VDD voltages below 8.5 V, the regulator is in a low-dropout
mode of operation and tries to provide as little impedance as possible from VDD to DBP. Above 10 V at VDD, the
regulator regulates DBP to 8 V. Between these two voltages, the regulator remains in the state it was in when
VDD entered this region (see Figure 20). Small amounts of current can be drawn from this pin for other circuit
functions, as long as power dissipation in the controller device remains at acceptable levels and junction
temperature does not exceed 125°C.
The LVBP pin is connected to another internal regulator that provides 4.2 V (nom) for the operation of
low-voltage circuitry in the controller. This pin can be used for other circuit purposes, but extreme care must be
taken to ensure that no extra noise is coupled onto this pin; otherwise, controller performance suffers. Current
draw is not to exceed 1 mA. See Figure 21 for typical output voltage at this pin.
The power dissipation in the TPS40077 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) can be calculated from:
PD = Qg × VDR × fSW
(Watts/driver)
where VDR is the driver output voltage
The total power dissipation in the TPS40077, assuming the same MOSFET is selected for both the high-side and
synchronous rectifier, is described in Equation 14 or Equation 15.
or
where IQ is the quiescent operating current (neglecting drivers)
The maximum power capability of the TPS40077 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, is 37°C/W. See the application report titled PowerPAD Thermally Enhanced Package (SLMA002) for
detailed information on PowerPAD package mounting and usage.
The maximum allowable package power dissipation is related to ambient temperature by Equation 16. For
θ
JA,
see the Package Dissipation Ratings table.
Substituting Equation 16 into Equation 15 and solving for fSW yields the maximum operating frequency for the
TPS40077. The result is described in Equation 17.
Copyright 2007–2009, Texas Instruments Incorporated
21
Product Folder Link(s) :TPS40077
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| TPS40090 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH FREQUENCY MULTIPHASE CONTROLLER |
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