- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383157 > ISL6560CBZ-T (INTERSIL CORP) Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller PDF資料下載
參數(shù)資料
| 型號(hào)： | ISL6560CBZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller |
| 中文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MS-012-AC, SOIC-16 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 396K |
| 代理商： | ISL6560CBZ-T |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)當(dāng)前第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)
10
FN9011.3
To calculate the dissipation in the 5m
resistor, we used
only half of the ripple current, 4A, to give a nominal
dissipation of:
Where I
P
is the peak current and D is the duty cycle. Two
10m
,
1W resistors in parallel were selected.
R
L
Selection
As discussed in the section under Droop Voltage and shown
in Figure 1, resistor R
L
establishes the gain of the
transconductance error amplifier. It is this resistor that sets
the droop voltage or regulation. Like any feedback system,
the higher the gain the better the regulation. The value of this
resistor may be determined from the following equation:
The ni term is the ratio of the V
COMP
to the current
comparator threshold voltage; see Figure 2. R
L
is made up
of two resistors that form a voltage divider from the internal
3V reference supply.
As described earlier in the
Circuit Description
section, the
output voltage of the gm amplifier establishes the threshold
voltage of the current comparator. At approximately 1V, the
current comparator threshold voltage is near zero. With no
current demands, the regulator output voltage would be the
same as the programmed DAC voltage. However, an 8A
ripple current was selected for this design. This results in the
output of the gm amplifier moving upwards to supply the
ripple current. The voltage at the COMP pin, V
SET
, will be:
The voltage divider establishes the reference voltage for
V
COMP
that was set to 1.2V for this design, so the error
amplifier must drive the COMP pin 50mV more positive to
bring it to 1.25V from the 1.2V originally set. This additional
50mV output will result in an input voltage to the error
amplifier of: 50mv / 19.1 = 2.62mV below the programmed
DAC voltage of 1.8V. Neglected, is a negative term
associated with the 60ns delay of the current comparator.
This delay will cause the current ramp to be slightly greater
than predicted by the equation. This means that the initial
setting should be slightly reduced to account for the increase
in current.
Once the value for R
L
is set, only the values of the resistors
that make up the voltage divider must be determined. Figure
8 shows the equations to determine the resistor network that
makes up R
L
.
C
C
and R
C
Selection
Optimum transient response depends upon the selection of
the compensation capacitor network placed across the
output of the transconductance error amplifier.
To a first order, the selection of the capacitor, C
C
, placed
across the error amplifier may be determined by making the
product of the regulator output resistance and output
capacitors equal to the product of the R
L
and C
C
. This yields
the equation for the compensation capacitor:
A 1nF capacitor was selected from transient testing. To
prevent excessive phase shift due to the compensation
capacitor, it is usually necessary to place a resistor inseries
with the capacitor to prevent excessive phase shift beyond
the frequency of interest. This is pole cancellation and the
resistor is approximately 0.5 x R
L
. Figure 9 shows this
network and the equivalent circuit is approximately 0.5 x R
L
.
Many variables have been used in the selection of the
various gain and filter networks to this point. A broad range
of component tolerances range from
±
1% to
±
20% have
been used in the design. Therefore, it is important to
evaluate the entire system with dynamic pulse load testing.
This will verify optimum transient response and also indicate
poor response in terms of excessive overshoot, ringing or
oscillation if the compensation network is not optimum.
I
RMS
Ip
2
×
Ip D
Ip
0.4
2
------------
=
=
Power
0.69W per channel or 1.38W for both channels
=
Power
D
R
SENSE
3
=
×
=
∴
0.15
·
5m
×
×
R
L
ni
R
OUT
×
2
×
----------------------------------------
2.2mS
gm
×
2
×
=
-------------------------------------------------------
8.7k
=
=
=
g gm Amplifier Gain =
∴
RL
8.7k
19.1
=
×
1V
---------------------------------------------
+
=
1V
250mV
+
1.25V
=
=
V
SET
1V
I
---------------------------------------------------------------
R
ni
×
×
+
=
R
U
R
B
V
REF = 3V
To COMP pin,
this voltage is V
SET
R
U
I
---------------------------------------------------------------
+
R
B
||
R
L
R
=
R
U
V
SET
20.9k
--------------
=
R
L
×
R
B
V
REF
V
SET
-----------------–
=
R
U
×
V
SET
1V
ni
×
×
=
R
U
1.25V
---------------
=
8.7k
×
=
R
B
1.25V
---------–
=
20.9k
×
14.9k
=
FIGURE 8. EQUATIONS TO DETERMINE R
L
DIVIDER
C
C
R
--------------------------------------
C
R
L
----------------------------------------
8.7k
1.68nF
=
=
=
RU
R
B
V
REF = 3V
C
C
R
C
R
C
= 0.5 x R
L
R
L
C
C
R
C
AC Equivalent
To COMP pin
FIGURE 9. COMPENSATION CIRCUIT
ISL6560
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6561IRZ-T | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
| ISL6561CR-T | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
| ISL6561CR | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
| ISL6561CRZ | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
| ISL6561 | 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) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6560EVAL1 | 功能描述:EVALUATION BOARD ISL6560 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。