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| 型号： | L6717 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48 |
| 文件页数： | 42/56页 |
| 文件大小： | 1081K |
| 代理商： | L6717 |
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L6717
High current embedded drivers
Doc ID 17326 Rev 1
47/56
10
High current embedded drivers
L6717 provides high-current driving control for CORE and NB sections. The driver for the
high-side MOSFET use BOOTx pin for supply and PHASEx pin for return. The driver for the
low-side MOSFET use the VCCDR pin for supply and GND pin for return.
The embedded driver embodies an anti-shoot-through and adaptive dead-time control to
minimize low-side body diode conduction time maintaining good efficiency saving the use of
Schottky diodes: when the high-side MOSFET turns off, the voltage on its source begins to
fall; when the voltage reaches about 2 V, the low-side MOSFET gate drive voltage is
suddenly applied. When the low-side MOSFET turns off, the voltage at LGATE pin is
sensed. When it drops below about 1 V, the high-side MOSFET gate drive voltage is
suddenly applied. If the current flowing in the inductor is negative, the source of high-side
MOSFET 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 doesn't drop, the
low-side MOSFET is switched on so allowing the negative current of the inductor to
recirculate. This mechanism allows the system to regulate even if the current is negative.
10.1
Boot capacitor design
Bootstrap capacitor needs to be designed in order to show a negligible discharge due to the
high-side MOSFET turn-on. In fact it must give a stable voltage supply to the high-side driver
during the MOSFET turn-on also minimizing the power dissipated by the embedded boot
diode. Figure 16 gives some guidelines on how to select the capacitance value for the
bootstrap according to the desired discharge and depending on the selected MOSFET.
To prevent bootstrap capacitor to extra-charge as a consequence of large negative spikes,
an external series resistance RBOOT (in the range of few ohms) may be required in series to
BOOT pin.
Figure 16.
Bootstrap capacitor design
0.0
0.5
1.0
1.5
2.0
2.5
0
10
203040
50
6070
8090
100
High-Side MOSFET Gate Charge [nC]
BOOT
C
ap
d
is
char
ge
[
V
]
Cboot = 47nF
Cboot = 100nF
Cboot = 220nF
Cboot = 330nF
Cboot = 470nF
0
500
1000
1500
2000
2500
0.0
0.2
0.4
0.6
0.8
1.0
Boot Cap Delta Voltage [V]
Boot
st
rap
C
ap
[
uF
]
Qg = 10nC
Qg = 25nC
Qg = 50nC
Qg = 100nC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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:开关变换器、稳压器与控制器 High-Efficienc AM2r2 Hybrid Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6718TR | 功能描述:其他电源管理 Multiphase Dual PWM VR12 25MHz LTB RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| L6720 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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