参数资料
型号: TPS54140DGQR
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封装: GREEN, PLASTIC, MSOP-10
文件页数: 32/46页
文件大小: 1778K
代理商: TPS54140DGQR
Power Dissipation Estimate
2
Vo
Pcon = Io
Rdson
Vin
(54)
2
9
Psw = Vin
sw
lo
0.25
10-
(55)
9
Pgd = Vin
3
10
sw
-
(56)
6
Pq = 116
10
Vin
-
(57)
Ptot = Pcon + Psw + Pgd + Pq
(58)
TJ = TA + Rth
Ptot
(59)
TAmax = TJmax
Rth
Ptot
-
(60)
SLVS889 – OCTOBER 2008 .............................................................................................................................................................................................. www.ti.com
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).
Where:
IOUT is the output current (A).
Rdson 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
For given TA,
For given TJMAX = 150°C
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.
38
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS54140
相关PDF资料
PDF描述
TPS54140DGQ SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
TPS54162QPWPRQ1 3 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20
TPS5420DR 5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
TPS5420D 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
TPS54226PWP DUAL SWITCHING CONTROLLER, PDSO20
相关代理商/技术参数
参数描述
TPS54140EVM-429 功能描述:电源管理IC开发工具 1.5A,25-42V In SWIFT Cnvrtr Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
TPS54140-Q1 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A 42-V STEP-DOWN SWIFTa?¢ DC/DC CONVERTER WITH Eco-modea?¢ CONTROL
TPS54140QDGQRQ1 功能描述:直流/直流开关调节器 AC 3.5-42V Inp,1.5A RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
TPS54140QDRCRQ1 功能描述:直流/直流开关调节器 AC 3.5-42V Inp,1.5A RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
TPS54160 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A, 60-V, STEP-DOWN SWIFT DC/DC CONVERTER WITH ECO-MODE