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| 型号： | L6713ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封装： | 10 X 10 MM, TQFP-64 |
| 文件页数： | 42/64页 |
| 文件大小： | 801K |
| 代理商： | L6713ATR |
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L6713A
Output voltage monitor and protections
47/64
17
Output voltage monitor and protections
L6713A 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 12) but the behavior in
response to a protection event is still the same as described below.
When using OFFSET functionality the OVP, UVP and PGOOD thresholds change in
according to the OFFSET voltage:
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.
17.1
Under voltage
If the output voltage monitored by VSEN drops more than -750 mV below the programmed
reference for more than one clock period, L6713A turns OFF all MOSFETs and latches the
condition: to recover it is required to cycle Vcc or the OUTEN pin. This is independent of the
selected operative mode.
17.2
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 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 UVLOOVP.
This protection turns-ON the low side MOSFETs as long as the VSEN pin voltage is greater
with 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 22.
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 22-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. Preliminary OVP is always active before UVLOVCC for both Intel and
AMD modes.
V
SEN
V
OUT
R
OFFSET
() I
OFFSET
()
V
OUT TH
[]
–
V
SEN TH
[]
R
OFFSET
() I
OFFSET
+
==
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| 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 |
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