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參數(shù)資料

型號：	HIP6018BCBZ-T
廠商：	Intersil
文件頁數(shù)：	12/15頁
文件大小：	384K
描述：	IC REG TRPL BCK/LINEAR 24-SOIC
標準包裝：	1,000
拓撲：	降壓（降壓）同步（1），線性（LDO）（2）
功能：	任何功能
輸出數(shù)：	3
頻率 - 開關(guān)：	215kHz
電壓/電流 - 輸出 1：	控制器
電壓/電流 - 輸出 2：	2.5V，-
電壓/電流 - 輸出 3：	控制器
帶 LED 驅(qū)動器：	無
帶監(jiān)控器：	無
帶序列發(fā)生器：	無
電源電壓：	3.3 V ~ 12 V
工作溫度：	0°C ~ 70°C
安裝類型：	*
封裝/外殼：	24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝：	*
包裝：	帶卷 (TR)

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PWM Output Capacitors

Modern microprocessors produce transient load rates above

10A/ns. High frequency capacitors initially supply the transient

and slow the current load rate seen by the bulk capacitors.

The bulk filter capacitor values are generally determined by

the ESR (effective series resistance) and ESL (effective

series inductance) parameters rather than actual capacitance.

High frequency decoupling capacitors should be placed as

close to the power pins of the load as physically possible. Be

careful not to add inductance in the circuit board wiring that

could cancel the usefulness of these low inductance

components. Consult with the manufacturer of the load on

specific decoupling requirements.

Use only specialized low-ESR capacitors intended for switching

regulator applications for the bulk capacitors. The bulk

capacitors ESR determines the output ripple voltage and the

initial voltage drop after a high slew-rate transient. An aluminum

electrolytic capacitors ESR value is related to the case size

with lower ESR available in larger case sizes. However, the

equivalent series inductance of these capacitors increases with

case size and can reduce the usefulness of the capacitor to

high slew-rate transient loading. Unfortunately, ESL is not a

specified parameter. Work with your capacitor supplier and

measure the capacitors impedance with frequency to select

suitable components. In most cases, multiple electrolytic

capacitors of small case size perform better than a single large

case capacitor. For a given transient load magnitude, the

output voltage transient response due to the output capacitor

characteristics can be approximated by the following equation:

Linear Output Capacitors

The output capacitors for the linear regulator and the linear

controller provide dynamic load current. The linear controller

uses dominant pole compensation integrated in the error

amplifier and is insensitive to output capacitor selection.

Capacitor, C

OUT3

should be selected for transient load

regulation.

The output capacitor for the linear regulator provides loop

stability. The linear regulator (OUT2) requires an output

capacitor characteristic shown in Figure 13. The upper line

plots the 45 phase margin with 150mA load and the lower

line is the 45 phase margin limit with a 10mA load. Select a

OUT2

capacitor with characteristic between the two limits.

Output Inductor Selection

The PWM converter requires an output inductor. The output

inductor is selected to meet the output voltage ripple

requirements and sets the converters response time to a

load transient. The inductor value determines the converters

ripple current and the ripple voltage is a function of the ripple

current. The ripple voltage and current are approximated by

the following equations:

Increasing the value of inductance reduces the ripple current

and voltage. However, the large inductance values reduce

the converters response time to a load transient.

One of the parameters limiting the converters response to a

load transient is the time required to change the inductor

current. Given a sufficiently fast control loop design, the

HIP6018B will provide either 0% or 100% duty cycle in

response to a load transient. The response time is the time

interval required to slew the inductor current from an initial

current value to the post-transient current level. During this

interval the difference between the inductor current and the

transient current level must be supplied by the output

capacitors. Minimizing the response time can minimize the

output capacitance required.

The response time to a transient is different for the

application of load and the removal of load. The following

equations give the approximate response time interval for

application and removal of a transient load:

where: I

TRAN

is the transient load current step, t

RISE

is the

response time to the application of load, and t

FALL

is the

response time to the removal of load. With a +5V input

source, the worst case response time can be either at the

application or removal of load, and dependent upon the

output voltage setting. Be sure to check both of these

equations at the minimum and maximum output levels for

the worst case response time.

Input Capacitor Selection

The important parameters for the bulk input capacitor are the

voltage rating and the RMS current rating. For reliable

operation, select the bulk capacitor with voltage and current

ratings above the maximum input voltage and largest RMS

current required by the circuit. The capacitor voltage rating

should be at least 1.25 times greater than the maximum

input voltage and a voltage rating of 1.5 times is a

conservative guideline.

TRAN

ESL

TRAN

---------------------

?/DIV>

ESR I

TRAN

?/DIV>

1000

100

0.1

0.2

0.3

0.4

0.5

0.6

0.7

CAPACITANCE (?/SPAN>F)

ESR (?/SPAN>)

FIGURE 13. C

OUT2

OUTPUT CAPACITOR

擨

OUT

?/DIV>

--------------------------------

OUT

----------------

?/DIV>

擵

OUT

擨 ESR

?/DIV>

RISE

TRAN

?/DIV>

OUT

--------------------------------

FALL

TRAN

?/DIV>

OUT

-------------------------------

HIP6018B

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HIP6018CB	制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述:
HIP6018CB-T	制造商:Rochester Electronics LLC 功能描述:- Tape and Reel
HIP6018EVAL1	制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Advanced PWM and Dual Linear Power Control
HIP6019	制造商:IRF 制造商全稱:International Rectifier 功能描述:5-BIT PROGRAMMABLE SYNCHRONOUS BUCK, NON-SYNCHRONOUS,ADJUSTABLE LDO AND 200mA ON-BOARD LDO
HIP6019B	制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Control

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