参数资料
| 型号： | ISL6558IR-T |
| 厂商： | Intersil |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 75% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-VQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6558
+5V IN
+12V
USE INDIVIDUAL METAL RUNS
FOR EACH CHANNEL TO HELP
ISOLATE OUTPUT STAGES
C BP
VCC PVCC
BOOT
C BOOT
C IN
C BP
VCC
PWM
PWM
L O1
V OUT
PHASE
C C
COMP
FS/EN
C OUT
R C
R OS
FB
ISL6558
R T
HIP6601B
R ISEN
R FB
VSEN
ISEN
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT PLANE LAYER
VIA CONNECTION TO GROUND PLANE
FIGURE 9. PRINTED CIRCUIT BOARD POWER PLANES AND ISLANDS
Component Selection Guidelines
OUTPUT CAPACITOR SELECTION
Output capacitors are required to filter the output inductor
current ripple and supply the load transient current. The
filtering requirements are a function of the channel switching
frequency and the output ripple current. The load transient
requirements are a function of the slew rate (di/dt) and the
magnitude of the transient load current. These requirements
are generally met with a mix of capacitors and careful layout.
Some modern microprocessors can produce transient load
rates above 200A/ μ s. High frequency capacitors are used to
supply the initial transient current and slow the rate-of-change
seen by the bulk capacitors. Bulk filter capacitor values are
generally determined by the ESR and voltage rating
requirements rather than actual capacitance requirements.
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
device for any specific decoupling requirements.
Specialized low-ESR capacitors intended for switching
regulator applications are recommended for the bulk
capacitors. The bulk capacitor’s ESR determines the output
ripple voltage and the initial voltage drop following a high
slew-rate transient edge. Aluminum electrolytic capacitor ESR
values are related to case size with lower ESR available in
ESL is not a specified parameter. Work with your capacitor
supplier and measure the capacitor’s impedance with
frequency to select a suitable component. In most cases,
multiple electrolytic capacitors of small case size perform
better than a single large case capacitor.
OUTPUT INDUCTOR SELECTION
The output inductor is selected to meet the voltage ripple
requirements and minimize the converter response time to a
load transient. In a multi-phase converter topology, the ripple
current of one active channel partially cancels with the other
active channels to reduce the overall ripple current. The
reduction in total output ripple current results in a lower
overall output voltage ripple.
The inductor selected for the power channels determines the
channel ripple current. Increasing the value of inductance
reduces the total output ripple current and total output
voltage ripple. However, increasing the inductance value will
slow the converter response time to a load transient.
One of the parameters limiting the converter’s response time
to a load transient is the time required to slew the inductor
current from its initial current level to the transient current
level. During this interval, the difference between the two
levels must be supplied by the output capacitance.
Minimizing the response time can minimize the output
capacitance required.
The channel ripple current is approximated by the following
equation:
F SW xL
V IN
larger case sizes. However, the ESL of these capacitors
increases with case size and can reduce the usefulness of the
capacitor to high slew-rate transient loading. Unfortunately,
13
V IN – V OUT V OUT
D I CH = ---------------------------------- x -----------------
(EQ. 10)
FN9027.12
June 21, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6558IRZ | 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6558IRZA | 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6558IRZA-T | 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6558IRZA-TK | 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6558IRZR5240 | 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
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