參數(shù)資料
型號： ISL6561
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Multi-Phase PWM Controller with Precision rDS(ON) or DCR Differential Current Sensing for VR10.X Application(帶有精密rDS(ON)或DCR差分電流感應(yīng)的VR10.X專用多相PWM控制器)
中文描述： SWITCHING CONTROLLER, PQCC40
封裝： PLASTIC, MO-220VJJD2, MLFP, QFN-40
文件頁數(shù)： 18/26頁
文件大?。?/td> 782K
代理商： ISL6561
18
FN9098.5
May 12, 2005
For example, a regulator with 250kHz switching frequency
having VID set to 1.35V has t
SS
equal to 6.912ms.
A 100mV offset exists on the remote-sense amplifier at the
beginning of soft start and ramps to zero during the first 640
cycles of soft start (704 cycles following enable). This
prevents the large inrush current that would otherwise occur
should the output voltage start out with a slight negative
bias.
During the first 640 cycles of soft start (704 cycles following
enable) the DAC voltage increments the reference in 25mV
steps. The remainder of soft start sees the DAC ramping
with 12.5mV steps.
Fault Monitoring and Protection
The ISL6561 actively monitors output voltage and current to
detect fault conditions. Fault monitors trigger protective
measures to prevent damage to a microprocessor load. One
common power good indicator is provided for linking to
external system monitors. The schematic in Figure 11
outlines the interaction between the fault monitors and the
power good signal.
Power Good Signal
The power good pin (PGOOD) is an open-drain logic output
that transitions high when the converter is operating after
soft start. PGOOD pulls low during shutdown and releases
high after a successful soft start. PGOOD only transitions
low when an under-voltage condition is detected or the
controller is disabled by a reset from EN, ENLL, POR, or one
of the no-CPU VID codes. After an under voltage event,
PGOOD will return high unless the controller has been
disabled. PGOOD does not automatically transition low upon
detection of an overvoltage condition.
Under-Voltage Detection
The under-voltage threshold is set at 75% of the VID code.
When the output voltage at VSEN is below the under-voltage
threshold, PGOOD gets pulled low.
Overvoltage Protection
When VCC is above 1.4V, but otherwise not valid as defined
under
Power on Reset
in
Electrical Specifications
, the
overvoltage trip circuit is active using auxiliary circuitry. In
this state, an overvoltage trip occurs if the voltage at VSEN
exceeds 1.8V.
With valid VCC, the overvoltage circuit is sensitive to the
voltage at VDIFF. In this state, the trip level is 1.7V prior to
valid enable conditions being met as described in
Enable
and Disable
. The only exception to this is when the IC has
been disabled by an overvoltage trip. In that case the
overvoltage trip point is VID plus 200mV. During soft start,
the overvoltage trip level is the higher of 1.7V or VID plus
200mV. Upon successful soft start, the overvoltage trip level
is 200mV above VID. Two actions are taken by the ISL6561
to protect the microprocessor load when an overvoltage
condition occurs.
At the inception of an overvoltage event, all PWM outputs
are commanded low until the voltage at VSEN falls below
0.6V with valid VCC or 1.5V otherwise. This causes the
Intersil drivers to turn on the lower MOSFETs and pull the
output voltage below a level that might cause damage to the
load. The PWM outputs remain low until VDIFF falls to the
programmed DAC level when they enter a high-impedance
state. The Intersil drivers respond to the high-impedance
input by turning off both upper and lower MOSFETs. If the
overvoltage condition reoccurs, the ISL6561 will again
FIGURE 10. SOFT-START WAVEFORMS WITH AN UN-BIASED
OUTPUT. FSW = 500kHz
VOUT, 500mV/DIV
EN, 5V/DIV
500
μ
s/DIV
FIGURE 11. POWER GOOD AND PROTECTION CIRCUITRY
OVP
-
+
VID + 0.2V
VDIFF
-
+
100
μ
A
I
AVG
-
+
DAC
REFERENCE
OV
OC
UV
PGOOD
75%
SOFT START, FAULT
AND CONTROL LOGIC
-
+
OC
I
1
REPEAT FOR
EACH CHANNEL
100
μ
A
ISL6561
相關(guān)PDF資料
PDF描述
ISL6561CRZ-T Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application
ISL6561CRZA Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application
ISL6561IR Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application
ISL6561IRZ Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application
ISL6561IR-T Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6561CR 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
ISL6561CR-T 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
ISL6561CRZ 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
ISL6561CRZ 制造商:Intersil Corporation 功能描述:Pulse Width Modulation (PWM) Controller
ISL6561CRZA 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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