參數(shù)資料
型號： L6717
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48
文件頁數(shù)： 36/56頁
文件大?。?/td> 1081K
代理商： L6717
L6717
Output voltage monitoring and protections
Doc ID 17326 Rev 1
41/56
8
Output voltage monitoring and protections
L6717 monitors the regulated voltage of both sections through pin VSEN and NB_VSEN in
order to manage OV, UV and PWRGOOD. The device shows different thresholds when in
different operative conditions but the behavior in response to a protection event is still the
same as described below.
Protections are active also during soft-start (See Section 7.8) while they are masked during
OTF-VID transitions with an additional delay to avoid false triggering.
Table 20.
L6717 protection at a glance
8.1
Programmable overvoltage (I2DIS = 3.3 V)
When power manager I2C is disabled, L6717 provides the possibility to adjust OV threshold
(common for both sections) through the SDA/OVP pin. Connecting the pin to the center tap
of a voltage divider from 3.3 V to SGND, the OVP threshold becomes the voltage present at
the pin.
The OVP threshold results:
L6717
Section
CORE
North bridge
Overvoltage
(OV)
SVI / PVI: +250mV above reference, programmable by power manager
I2C bus.
I2CDIS = 3.3V: Programmable through SDA/OVP pin.
V_FIX: Fixed to 1.8V.
Action: IC Latch; LS=ON & PWMx = 0 (if applicable);
Other section (SVI only): HiZ; FLT driven high.
Undervoltage
(UV)
VSEN, NB_VSEN = VID -400mV. Active after Ref > 500mV
Action: IC latch; both sections HiZ; FLT driven high.
PWRGOOD
PWRGOOD is the logic AND between internal CORE and NB PGOOD in SVI
mode while is the CORE section PGOOD in PVI mode.
Each PGOOD is set to zero when the related voltage falls below the
programmed reference -250mV.
Action: Section(s) continue switching, PWRGOOD driven low.
VSEN, NB_VSEN
disconnection
Set when VSEN > CS1N +600mV.
Action: UV-Like
Set when VSEN > NB_CSN +600mV.
Action: UV-Like (SVI only)
FBG, NB_FBG
disconnection
Internal comparator across the opamp to recover from GND losses.
Action: UV-Like
Over Current
(OC)
Current monitor across inductor DCR.
Dual protection, per-phase and
average.
Action: UV-Like
Current monitor across inductor DCR.
Constant current.
Action: UV-Like
On-the-fly VID
Protections masked with the exception of OC with additional 16 clock delay to
prevent from false triggering (both SVI and PVI).
OVP
TH
3.3
R
OVPL
R
OVPH
R
+
OVPL
-------------------------------------------
=
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相關代理商/技術參數(shù)
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L6720 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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