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| 型号： | L6714TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封装： | 10 X 10 MM, LEAD FREE, TQFP-64 |
| 文件页数： | 42/70页 |
| 文件大小： | 694K |
| 代理商： | L6714TR |
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L6714
Output voltage monitor and protections
47/70
16
Output voltage monitor and protections
L6714 monitors through pin VSEN the regulated voltage in order to manage the OVP, UVP
and PGOOD (when applicable) conditions. The device shows different thresholds when
programming different operation mode (Intel or AMD, See Table 10) but the behavior in
response to a protection event is still the same as described below.
Protections are active also during soft-start (See “Soft start” Section) while are masked
during D-VID transitions with an additional 32 clock cycle delay after the transition has
finished to avoid false triggering.
16.1
Under voltage
If the output voltage monitored by VSEN drops more than -750mV below the programmed
reference for more than one clock period, L6714 turns off all MOSFET and latches the
condition: to recover it is required to cycle Vcc or the OUTEN pin. This is independent of the
selected operative mode.
16.2
Preliminary over voltage
To provide a protection while VCC is below the UVLOVCC threshold is fundamental to avoid
damage to the CPU in case of failed HS MOSFET. In fact, since the device is supplied from
the 12V bus, it is basically “blind” for any voltage below the turn-on threshold (UVLOVCC). In
order to give full protection to the load, a preliminary-OVP protection is provided while VCC
is within UVLOVCC and UVLOOVP.
This protection turns-on the low side MOSFET as long as the FBR pin voltage is greater
a gate-to-source voltage depending on the voltage applied to VCCDRx and independently
by the turn-ON threshold across these pins (UVLOVCCDR). This protection depends also on
the OUTEN pin status as detailed in Figure 18.
A simple way to provide protection to the output in all conditions when the device is OFF
(then avoiding the unprotected red region in Figure 18-Left) consists in supplying the
+12V and, in case of HS short, the LS MOSFET is driven with 5V assuring a reliable
protection of the load. Preliminary OVP is always active before UVLOVCC for both Intel and
AMD Modes.
Figure 18. Output voltage protections and typical principle connections
VCC
VCCDR1
VCCDR2
VCCDR3
+12V
+5V
SB
Vcc
UVLO
OVP
UVLO
VCC
Preliminary OVP Enabled
FBR Monitored
No Protection
Provided
(OUTEN = 1)
Programmable OVP
VSEN Monitored
(OUTEN = 0)
Preliminary OVP
FBR Monitored
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| L6714 | SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6716 | 制造商:STMicroelectronics 功能描述:DC DC Cntrlr Quad-OUT Sync Step Down 48-Pin VFQFPN EP Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:2/3/4 Phase Controlr Embedded Driver |
| L6716TR | 功能描述:开关变换器、稳压器与控制器 2/3/4 phase CNTRL Embedded Drivers 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 |
| 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 |
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