參數(shù)資料
型號： ISL6565ACBZ
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 Current Sensing for VR10.X Application
中文描述： SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO28
封裝： ROHS COMPLIANT, PLASTIC, MS-013-AE, SOIC-28
文件頁數(shù)： 12/28頁
文件大?。?/td> 722K
代理商： ISL6565ACBZ
12
INDUCTOR DCR SENSING (ISL6565B ONLY)
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 5. The channel current
I
L
, flowing through the inductor, passes through the DCR.
Equation 5 shows the s-domain equivalent voltage, V
L
,
across the inductor.
A simple R-C network across the inductor (R
1
and C)
extracts the DCR voltage, as shown in Figure 5. The voltage
across the sense capacitor, V
C
, can be shown to be
proportional to the channel current I
L
, shown in Equation 6.
In some cases it may be necessary to use a resistor divider
R-C network to sense the current through the inductor. This
can be accomplished by placing a second resistor, R
2
,
across the sense capacitor. In these cases the voltage
across the sense capacitor, V
C
, becomes proportional to the
channel current I
L
, and the resistor divider ratio, K.
If the R-C network components are selected such that the
RC time constant matches the inductor L/DCR time
constant, then V
C
is equal to the voltage drop across the
DCR multiplied by the ratio of the resistor divider, K.
If a
resistor divider is not being used, the value for K is 1
.
The capacitor voltage V
C
, is then replicated across the
sense resistor R
ISEN
.
The regulator should have only one
R
ISEN
resistor connected from the V
OUT
plane to the
ICOMMON pin
. The current through R
ISEN
is proportional to
the inductor current. Equation 9 shows that the proportion
between the channel current and the sensed current (I
SEN
)
is driven by the value of the sense resistor chosen, the
resistor divider ratio, and the DCR of the inductor.
Channel-Current Balance
The sampled currents, I
n
, from each active channel are
summed together and divided by the number of active
channels. The resulting cycle average current, I
AVG
,
provides a measure of the total load-current demand on the
converter during each switching cycle. Channel-current
balance is achieved by comparing the sampled current of
each channel to the cycle average current, and making the
proper adjustment to each channel pulse width based on the
error. Intersil’s patented current-balance method is illustrated
in Figure 6, with error correction for channel 1 represented.
In the figure, the cycle average current combines with the
channel 1 sample, I
1
, to create an error signal I
ER
.
FIGURE 4. ISL6565A INTERNAL AND EXTERNAL CURRENT-
SENSING CIRCUITRY
I
n
ISEN
IL
)
rRISEN
=
-
+
ISEN(n)
R
ISEN
SAMPLE
&
HOLD
ISL6565A INTERNAL CIRCUIT
EXTERNAL CIRCUIT
V
IN
CHANNEL N
UPPER MOSFET
CHANNEL N
LOWER MOSFET
-
+
ILrDS ON
)
I
L
V
L
s
( )
I
L
s L
DCR
+
(
)
=
(EQ. 5)
V
C
s
( )
1
-------------
1
+
)
--------------------------+
DCR I
L
=
(EQ. 6)
V
C
s
( )
1
-------------
1
+
s
R
2
---------+
C
(
)
R
2
1
+
-------------------------------------------------------
K DCR I
L
=
(EQ. 7)
K
R
2
R
1
---------+
=
(EQ. 8)
FIGURE 5. DCR SENSING CONFIGURATION
I
n
-
+
ISEN(n)
SAMPLE
&
HOLD
ISL6565B INTERNAL CIRCUIT
V
IN
ICOMMON
PWM(n)
ISL6605
R
ISEN
DCR
L
INDUCTOR
+V
L
(s)
R
1
V
OUT
C
OUT
-
+V
C
(s)
C
IL
-
I
SEN
R
2*
V
C
(s)
+
-
*R
2
is OPTIONAL
I
n
K I
L
R
ISEN
-----------------
=
(EQ. 9)
ISL6565A, ISL6565B
相關(guān)PDF資料
PDF描述
ISL6565ACRZ Multi-Phase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application
ISL6565ACV Multi-Phase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application
ISL6565ACVZ Multi-Phase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application
ISL6565B Multi-Phase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application
ISL6565BCB Multi-Phase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6565ACBZ-T 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR)
ISL6565ACR 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF)
ISL6565ACR-T 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF)
ISL6565ACRZ 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR)
ISL6565ACRZ-T 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR)
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