參數(shù)資料
型號(hào)： L6701TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36
封裝： LEAD FREE, SSO-36
文件頁(yè)數(shù)： 25/44頁(yè)
文件大小： 627K
代理商： L6701TR
Obsolete
Product(s)
- Obsolete
Product(s)
L6701
13 Output voltage Monitor and Protections
31/44
Figure 14. Feedback Disconnection
13.5
PGOOD (Only for VR9 and K8 Modes)
It is an open-drain signal set free after the soft-start sequence has finished. It is pulled low
when the output voltage drops below -230mV of the programmed voltage.
13.6
Over Current Protection
Output current in each phase is monitored by L6701 through RISEN and so, programming the
value of these resistors, it is possible to set the OCP to the desired value. The Over Current
threshold has to be programmed to a safe value, in order to be sure that the device doesn't
enter OCP during normal operation of the device. This value must take into consideration also
the extra current needed during the Dynamic VID Transition ID-VID and, since the device reads
across MOSFETs RDS(on), the process spread and temperature variations of these sensing
elements. Moreover, since also the internal threshold spreads, the Rg design has to consider
the minimum value IOCTH(min) of the threshold as follow:
where IOCPx is the current measured by the current reading circuitry when the device enters
Quasi-Constant-Current.
Since the device reads the current across Low Side MOSFETs, it limits the bottom of the
inductor current entering in constant current until setting UVP as below explained. IOCPx must
be calculated starting from the corresponding output current value IOUT(OCP) as follow (ID-VID
must also be considered when D-VID are supported) since the device holds the valley current
information:
where IOUT(OCP) is still the output current value at which the device enters Quasi-Constant-
Current, IPP is the inductor current ripple in each phase and ID-VID is the additional current
required by D-VID (when applicable). In particular, since the device limits the valley of the
L2
L1
L3
DCR1
DCR2
DCR3
CD
RD
RD RD
RG
PHASE3
PHASE2
PHASE1
VOUT
IINFO
CS_DROOP+
CS_DROOP-
FB
IDROOP
x 3
RF
CF
RFB
COMP
VSEN
FBR
FBG
VID
FB_DISCONNECTED
1V
Rg
I
OC Px m ax
() RdsON max
()
I
OCTH m in
()
------------------------------------------------------------------
=
I
OCPx
I
OU T O CP
()
3
----------------------------
I
PP
2
------------
I
DVID
–
3
------------------
+
–
=
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L6709TR 功能描述:功率驅(qū)動(dòng)器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
L6710 功能描述:功率驅(qū)動(dòng)器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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