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| 型号： | L6716TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48 |
| 文件页数： | 33/57页 |
| 文件大小： | 829K |
| 代理商： | L6716TR |
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L6716
Output voltage monitor and protections
Doc ID 14521 Rev 3
39/57
18
Output voltage monitor and protections
L6716 monitors through pin VSEN the regulated voltage in order to manage the OVP and
UVP conditions. Protections are active also during soft-start (Section 17: Soft-start on
page 36) while they are masked during D-VID transitions with an additional 67 s delay after
the transition has finished to avoid false triggering.
18.1
Undervoltage
If the output voltage monitored by VSEN drops more than 600 mV (typ) below the
programmed reference for more than one clock period, the L6716:
●
Permanently turns OFF all the MOSFETs (PWM4 is forced in high impedance when
external driver is used)
●
Drives the OSC/ FAULT pin high (3.3 V typ).
●
Power supply or OUTEN pin cycling is required to restart operations.
18.2
Preliminary overvoltage
To provide a protection while VCC is below the UVLOVCC threshold is fundamental to avoid
damage to the CPU in case of failed HS MOSFETs. In fact, since the device is supplied from
the 12 V 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 UVLOPre-OVP.
This protection turns-on the low side MOSFETs as long as the VSEN pin voltage is greater
than 1.800 V with a 350 mV hysteresis. When set, the protection drives the LS MOSFET
with a gate-to-source voltage depending on the voltage applied to VCC. This protection
depends also on the OUTEN pin status as detailed in Figure 23.
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 23-Left) consists in supplying the
before +12 V and, in case of HS short, the LS MOSFET is driven with 5 V assuring a reliable
protection of the load.
Figure 23.
Output voltage protections and typical principle connections
Note:
The device turns ON only LS MOSFETs of Phase1-Phase3 if the Pre-OVP is detected
before that VCC is higher than UVLOVCC. (The device reads PWM4 information if the VCC is
higher than UVLOVCC).
Vcc
UVLO
OVP
UVLO
VCC
Preliminary OVP Enabled
VSEN Monitored
No Protection
Provided
(OUTEN = 1)
Programmable OVP
VSEN Monitored
(OUTEN = 0)
Preliminary OVP
VSEN Monitored
VCC
VCCDR
+12V
+5V
SB
10
Ω
2.2
Ω
BAT54C
1
μF
2x1
μF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: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 |
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