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| 型号： | L6728D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, DFN-10 |
| 文件页数： | 2/33页 |
| 文件大小： | 1215K |
| 代理商： | L6728D |
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Driver section
L6728D
10/33
Doc ID 16498 Rev 1
6
Driver section
The integrated high-current drivers permit the use of different types of power MOSFETs
(also multiple MOSFETs to reduce the equivalent RDS(on)), maintaining fast switching
transition.
The driver for the high-side MOSFET uses the BOOT pin for supply and the PHASE pin for
return. The driver for low-side MOSFET uses the VCC pin for supply and the GND pin for
return.
The controller embodies an anti-shoot-through and adaptive dead-time control to minimize
low side body diode conduction time, maintaining good efficiency while eliminating the need
for a Schottky diode:
●
to check the high-side MOSFET turn-off, the PHASE pin is sensed. When the voltage
at the PHASE pin drops, the low-side MOSFET gate drive is suddenly applied
●
to check the low-side MOSFET turn-off, the LGATE pin is sensed. When the voltage at
LGATE has fallen, the high-side MOSFET gate drive is suddenly applied
If the current flowing in the inductor is negative, voltage on the PHASE pin will never drop.
To allow the low-side MOSFET to turn on even in this case, a watchdog controller is
enabled. If the source of the high-side MOSFET does not drop, the low side MOSFET is
switched on, thereby allowing the negative current of the inductor to recirculate. This
mechanism allows the system to regulate even if the current is negative.
Power conversion input is flexible: 5 V, 12 V bus or any bus that allows the conversion (see
maximum duty cycle limitations) to be chosen freely.
6.1
Power dissipation
The L6728D embeds high current MOSFET drivers for both high side and low side
MOSFETs. It is therefore important to consider the power that the device is going to
dissipate in driving them, in order to avoid overcoming the maximum junction operating
temperature.
Two main factors contribute to device power dissipation: bias power and driver power.
●
Device bias power (PDC) depends on the static consumption of the device through the
supply pins, and is quantifiable as follows (assuming HS and LS drivers with the same
VCC of the device):
●
Driver 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 (easily calculable) is dissipated by three main
factors: external gate resistance (when present), intrinsic MOSFET resistance and
intrinsic driver resistance. This last factor is the most important one to be determined to
calculate the device power dissipation. The total power dissipated to switch the
MOSFETs is:
P
DC
V
CC
I
CC
I
BOOT
+
()
=
P
SW
F
SW
Q
gHS
V
BOOT
Q
gLS
V
CC
+
()
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6728DTR | 功能描述:电流型 PWM 控制器 Single-Phase PWM 5V to 12V Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6728H | 功能描述:电压模式 PWM 控制器 Sgl Output 300 KHz DFN-10 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6728HTR | 功能描述:电流型 PWM 控制器 SINGLE PHASE PWM CNTRL PWR GOOD RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6728TR | 功能描述:DC/DC 开关控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6730 | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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