參數(shù)資料
型號(hào)： L6716
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48
文件頁(yè)數(shù)： 15/57頁(yè)
文件大?。?/td> 829K
代理商： L6716
Power dissipation
L6716
22/57
Doc ID 14521 Rev 3
8
Power dissipation
L6716 embeds three high current MOSFET drivers for both high side and low side
MOSFETs: it is then important to consider the power the device is going to dissipate in
driving them in order to avoid overcoming the maximum junction operative temperature.
Exposed pad (PGND pin) needs to be soldered to the PCB power ground plane through
several VIAs in order to facilitate the heat dissipation.
Two main terms contribute in the device power dissipation: bias power and drivers' power.
The first one (PDC) depends on the static consumption of the device through the supply pins
and it is simply quantifiable as follow (assuming to supply HS and LS drivers with the same
VCC of the device):
where ND is the number of internal drivers used.
Drivers' power is the power needed by the driver to continuously switch on and off the
external MOSFETs; it is a function of the switching frequency and total gate charge of the
selected MOSFETs. It can be quantified considering that the total power PSW dissipated to
switch the MOSFETs (easy calculable) is dissipated by three main factors: external gate
resistance (when present), intrinsic MOSFET resistance and intrinsic driver resistance. This
last term is the important one to be determined to calculate the device power dissipation.
The total power dissipated to switch the MOSFETs results:
External gate resistors helps the device to dissipate the switching power since the same
power PSW will be shared between the internal driver impedance and the external resistor
resulting in a general cooling of the device. When driving multiple MOSFETs in parallel, it is
suggested to use one gate resistor for each MOSFET.
Figure 6.
L6716 dissipated power (quiescent + switching)
P
DC
V
CC
I
CC
I
CCDR
N
+
D
I
BOOTx
+
()
=
P
SW
N
D
F
SW
Q
GHS
V
BOOT
Q
GLS
V
CCDR
+
()
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6716TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2/3/4 phase CNTRL Embedded Drivers RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6717 制造商:STMicroelectronics 功能描述:High-Efficiency Hybrid AM2r2 Controller 48-Pin VFQFPN Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717A 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717ATR 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller T/R 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Tape and Reel 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 High-Efficienc AM2r2 Hybrid Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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