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參數(shù)資料
| 型號： | ISL6565B |
| 廠商： | Intersil Corporation |
| 英文描述： | Multi-Phase PWM Controller with Precision rDS(ON) or DCR Current Sensing for VR10.X Application |
| 中文描述： | 多相PWM控制器，帶有精密的RDS（ON）或DCR電流傳感針對VR10.x應(yīng)用 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 722K |
| 代理商： | ISL6565B |
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21
The time constant of this R-C network must match the time
constant of the inductor L/DCR. Follow the steps below to
choose the component values for this R-C network.
1. Choose an arbitrary value for C. The recommended value
is 0.01
μ
F.
2. Plug the Inductor L and DCR component values, and the
values for C chosen in steps 1, into Equation 28 to
calculate your value for R
1
. Do not populate R
2
.
Due to errors in the inductance or DCR it may be necessary
to adjust the value of R
1
for each phase to match the time
constants correctly.
Once the R-C network components have been chosen, use
Equation 29 to calculate the value of R
ISEN
. In Equation 29,
DCR is the DCR of the output inductor at room temperature,
I
FL
is the full load operating current, and N is the number of
phases.
Adjusting Phase Currents (ISL6565B Only)
Layout issues in the core-power regulator may cause the
currents in each phase to be slightly unbalanced. This
problem can be resolved without any changes to the layout or
any significant cost increase. The solution requires populating
R
2
in certain phases (as shown in Figure 16) to create a
resistor divider ratio, K, for each phase. The time constant of
each new resistor divider R-C sense network must match the
time constant of the old sense network. Follow the steps
below to choose the component values for the resistor
divider R-C network for each phase.
1. Load the regulator to full load and allow the board to heat
until the output voltage stabilizes (usually several
minutes).
2. Measure the current flowing through each phase,
labeling the highest phase current, I
HIGH
, and the other,
lower phase currents I
LOW
(1) and I
LOW
(2).
3. Individually, plug the values for each low phase current,
I
LOW
(n), the highest phase current, I
HIGH
, the full load
current, I
LOAD
, and the number of phases, N, into
Equation 30 to calculate the resistor divider ratio, K
LOW
,
for each low phase. (NOTE: The phase with the highest
phase current is the reference phase and it will not use a
resistor divider network, keeping its resistor divider ratio
equal to 1.)
( )
I
–
LOAD
4. For each phase, calculate the values for the new R-C
network sense resistors, R
1,new
and R
2,new
, by plugging
in each phase’s new resistor divider ratio, K
LOW
, and
each phase’s present sense resistor R
1
, into Equations
31 and 32.
After calculating the new resistor divider sense resistors, the
phases will be balanced. It may be necessary to adjust the
R
ISEN
resistor slightly to correct for any changes in the
desired I
SEN
current that results from adding the resistor
dividers.
The phase currents might also have to be adjusted if the
components of one or more phases are inhibited from
effectively dissipating their heat so that the affected phases
run hotter than desired. In this case it may be necessary to
adjust the resistor divider ratio of one or more of the R-C
networks. Doing so adjusts the current through affected
phases and can balance the temperatures of each phase.
Choose R
1,new
and R
2,new
in relation to the desired change
in temperature, as described in Equations 33 and 34, in order
to cause less current to flow in the hotter phase.
In Equations 33 and 34,
T
2
is the desired temperature rise
above the ambient temperature, and
T
1
is the measured
temperature rise above the ambient temperature. It is
FIGURE 16. DCR SENSING CONFIGURATION
ISEN(n)
ISL6565B
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
R
1
----------------------
=
(EQ. 28)
R
ISEN
DCR I
---------------------------------
70
10
×
N
=
(EQ. 29)
K
LOW
n
( )
1
I
n
--------------------------------------------
+
=
(EQ. 30)
R
1 new
n
( )
R
n
LOW
n
( )
-------------------------
=
(EQ. 31)
R
2 new
n
( )
R
n
K
LOW
n
1
–
----------------------------------
=
(EQ. 32)
R
1 new
,
R
1
T
2
T
1
----------
=
(EQ. 33)
R
2 new
,
R
R
R
1
R
2
1
1
T
2
---------
–
+
--------------------------------------------------
=
(EQ. 34)
ISL6565A, ISL6565B
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參數(shù)描述 |
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| ISL6565BCB | 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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) |
| ISL6565BCB-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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) |
| ISL6565BCBZ | 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(biāo)準(zhǔn)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) |
| ISL6565BCBZ-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(biāo)準(zhǔn)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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