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參數(shù)資料
| 型號： | ISL6553CB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PWM Controller with Wide Input Range 8-PDIP -25 to 85 |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, MS-012-AC, SOIC-16 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 182K |
| 代理商： | ISL6553CB |
11
With a high dv/dt load transient, typical of high performance
microprocessors, the largest deviations in output voltage
occur at the leading and trailing edges of the load transient. In
order to fully utilize the output-voltage tolerance range, the
output voltage is positioned in the upper half of the range
when the output is unloaded and in the lower half of the range
when the controller is under full load. This droop
compensation allows larger transient voltage deviations and
thus reduces the size and cost of the output filter components.
R
IN
should be selected to give the desired “droop” voltage at
the normal full load current 50
μ
A applied through the R
ISEN
resistor (or at a different full load current if adjusted as under
“Over-current, Selecting R
ISEN
” above).
R
IN
= V
DROOP
/ 50
μ
A
For a V
DROOP
of 80mV, R
IN
= 1.6k
The AC feedback components, R
FB
and Cc, are scaled in
relation to R
IN
.
Current Balancing
The detected currents are also used to balance the phase
currents.
Each phase’s current is compared to the average of the two
phase currents, and the difference is used to create an offset
in that phase’s PWM comparator. The offset is in a direction
to reduce the imbalance.
The balancing circuit can not make up for a difference in
r
DS(ON)
between synchronous rectifiers. If a FET has a
higher r
DS(ON)
, the current through that phase will be
reduced.
Figures 8 and 9 show the inductor current of a two phase
system without and with current balancing.
Inductor Current
The inductor current in each phase of a multi-phase Buck
converter has two components. There is a current equal to
the load current divided by the number of phases (I
LT
/ n),
and a sawtooth current, (i
PK-PK
) resulting from switching.
The sawtooth component is dependent on the size of the
inductors, the switching frequency of each phase, and the
values of the input and output voltage. Ignoring secondary
effects, such as series resistance, the peak to peak value of
the sawtooth current can be described by:
i
PK-PK
= (V
IN
x V
CORE
- V
CORE2
) / (L x F
SW
x V
IN
)
Where: V
CORE
= DC value of the output or V
ID
voltage
V
IN
= DC value of the input or supply voltage
L = value of the inductor
F
SW
= switching frequency
Example: For V
CORE
=1.6V,
V
IN
=12V,
L = 1.3
μ
H,
F
SW
= 250kHz,
Then i
PK-PK
= 4.3A
The inductor, or load current, flows alternately from V
IN
through Q1 and from ground through Q2. The ISL6553
samples the on-state voltage drop across each Q2 transistor
to indicate the inductor current in that phase. The voltage
drop is sampled 1/3 of a switching period, 1/F
SW
, after Q1 is
turned OFF and Q2 is turned on. Because of the sawtooth
current component, the sampled current is different from the
average current per phase. Neglecting secondary effects,
the sampled current (I
SAMPLE
) can be related to the load
current (I
LT
) by:
I
SAMPLE
=
I
LT
/ n +
(V
IN
V
CORE
- 3V
CORE2
) / (6L x F
SW
x V
IN
)
Where: I
LT
= total load current
n = the number of channels
Example: Using the previously given conditions, and
For I
LT
= 50A,
n = 2
Then I
SAMPLE
= 25.49A
0
5
10
15
20
25
A
FIGURE 8. TWO CHANNEL multi-phase SYSTEM WITH
CURRENT BALANCING DISABLED
0
5
10
15
20
25
A
FIGURE 9. TWO CHANNEL multi-phase SYSTEM WITH
CURRENT BALANCING ENABLED
ISL6553
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| ISL6553CB-T | 功能描述:IC REG CTRLR BUCK PWM 16-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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6553CBZ | 功能描述:IC REG CTRLR BUCK PWM 16-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) |
| ISL6553CBZA | 功能描述:IC REG CTRLR BUCK PWM 16-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) |
| ISL6553CBZA-T | 功能描述:IC REG CTRLR BUCK PWM 16-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) |
| ISL6553CBZ-T | 功能描述:IC REG CTRLR BUCK PWM 16-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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