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參數(shù)資料
| 型號： | ISL6565BCRZ |
| 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, PQCC28 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, MO-220VHHD, QFN-28 |
| 文件頁數(shù)： | 22/28頁 |
| 文件大?。?/td> | 722K |
| 代理商： | ISL6565BCRZ |
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22
important to note that when using Equations 33 and 34 the
resistor divider ratio of the corresponding phase RC network
is being changed. In the phase being adjusted, this new ratio,
K
new
(described in Equation 32), can not exceed 1.0.
T
1
T
2
If this occurs, the current in the hot phase cannot be reduced
any more. Instead of decreasing the current in the hot phase,
the current must be increased in the colder phases. To
accomplish this, use Equations 33 and 34 to get the desired
temperature rise in the cold phases.
While a single adjustment, according to Equations 33 and 34,
is usually sufficient, it may occasionally be necessary to adjust
R
1
and R
2
in the corresponding channels two or more times
to achieve optimal thermal balance between all phases.
Load-Line Regulation Resistor
The load-line regulation resistor is labeled R
FB
in Figure 7.
Its value depends on the desired full-load droop voltage
(V
DROOP
in Figure 7). Once the ISEN resistor has been
chosen, the load-line regulation resistor can be calculated
using Equation 36.
If one or more of the ISEN resistors is adjusted for thermal
balance, as in Equation 26, the load-line regulation resistor
should be selected according to Equation 37 where I
FL
is the
full-load operating current and R
ISEN(n)
is the ISEN resistor
connected to the n
th
ISEN pin.
Temperature Compensation Resistor
By combining Equations 17 and 18 found in the
Temperature
Compensation
section, the value of the TCOMP resistor can
be determined using Equation 38.
T
K
TC
In Equation 38, K
T
is the temperature coupling coefficient
between the ISL6565A and the closest lower MOSFET, or
the ISL6565B and the output inductor. It represents how
closely the controller temperature tracks the lower MOSFET
or inductor temperature. The value of K
T
is typically between
75% and 100%. K
TC
is the temperature dependant
transconductance of the internal compensation circuit. Its
value is designed as 2
μ
A/V/°C. The temperature coefficient
of MOSFET r
DS(ON)
or inductor DCR is given by
α
. This is
the ratio of the change in resistance to the change in
temperature. Resistance is normalized to the value at 25°C
and the value of is typically between 0.35%/°C and
0.50%/°C.
According to Equation 38, a voltage regulator with 80%
thermal coupling coefficient between the controller and lower
MOSFET and 0.4%/°C temperature coefficient of MOSFET
r
DS(ON)
requires a 2.5k
TCOMP resistor.
If the exact value for K
T
and
α
are not known, Equation 38
can give an incorrect value for R
TCOMP
. If this is the case,
follow the steps below to obtain an accurate value for
R
TCOMP
. This procedure works by making two output
voltage measurements. The first is made by using too much
temperature compensation, and the second with too little.
Each of the measurements produces an error and a linear
interpolation is used to find a TCOMP resistor value to
produce zero error. Make all measurements using a digital
multimeter accurate to 100
μ
V or better.
1. Install a 5k
resistor (R
1
) for R
TCOMP
.
2. Start the regulator at room temperature and apply full
load current. Record the output voltage, V
1
, immediately
after loading the regulator.
3. Allow the board to heat until the output voltage stabilizes
(usually several minutes). Record the output voltage, V
2
.
4. Install a 1k
resistor (R
2
) for R
TCOMP
.
5. Start the regulator at room temperature and apply full
load current. Record the output voltage, V
3
, immediately
after loading the regulator.
6. Allow the board to heat until the output voltage stabilizes
(usually several minutes). Record the output voltage, V
4
.
7. Calculate the correct value for R
TCOMP
using
Equation 39.
Compensation
The two opposing goals of compensating the voltage
regulator are stability and speed.
The load-line regulated converter behaves in a similar
manner to a peak-current mode controller because the two
poles at the output-filter L-C resonant frequency split with
the introduction of current information into the control loop.
The final location of these poles is determined by the system
function, the gain of the current signal, and the value of the
compensation components, R
C
and C
C
.
K
new
K
----------
=
(EQ. 35)
R
FB
V
------------------------
70 10
6
–
=
(EQ. 36)
R
FB
V
I
FL
r
DS ON
)
--------------------------------
R
ISEN n
( )
n
∑
=
(EQ. 37)
(EQ. 38)
R
TCOMP
K
=
α
(EQ. 39)
R
TCOMP
R
1
R
1
R
2
–
(
)
V
1
V
3
–
(
)
2
)
V
4
–
(
)
----------–
–
=
ISL6565A, ISL6565B
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| ISL6565BCRZ-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(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) |
| ISL6565BCV | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP 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) |
| ISL6565BCV-T | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP 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) |
| ISL6565BCVZ | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP 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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