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参数资料
| 型号： | ISL6223CAZA-T |
| 厂商： | Intersil |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 305kHz |
| 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： | 0°C ~ 70°C |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
+5V IN
+12V
USE INDIVIDUAL METAL RUNS
FOR EACH CHANNEL TO HELP
ISOLATE OUTPUT STAGES
C BP
LOCATE NEXT TO IC PIN(S)
VCC PVCC
C BOOT
C IN
LOCATE NEAR TRANSISTOR
C BP
V CC
PWM
HIP6601
L O1
V CORE
C T
R FB
COMP FS/DIS
ISL6223
R T
PHASE
C OUT
LOCATE NEXT
TO FB PIN
R IN
FB
LOCATE NEXT TO IC PIN
R SEN
VSEN
ISEN
KEY
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT PLANE LAYER
VIA CONNECTION TO GROUND PLANE
FIGURE 12. PRINTED CIRCUIT BOARD POWER PLANES AND ISLANDS
Component Selection Guidelines
Output Capacitor Selection
The output capacitor is selected to meet both the dynamic
load requirements and the voltage ripple requirements. The
load transient for the microprocessor CORE is characterized
by high slew rate (di/dt) current demands. In general,
multiple high quality capacitors of different size and dielectric
are paralleled to meet the design constraints.
Modern microprocessors produce severe transient load rates.
High frequency capacitors supply the initially transient current
and slow the load rate-of-change seen by the bulk capacitors.
The bulk filter capacitor values are generally determined by
the ESR (effective series resistance) and voltage rating
requirements rather than actual capacitance requirements.
ESL is not a specified parameter. Consult the capacitor
manufacturer and measure the capacitor’s impedance with
frequency to select a suitable component. For surface mount
designs, solid tantalum capacitors or Panasonic Speciality
Polymer (SP) capacitors can be used.
Output Inductor Selection
One of the parameters limiting the converter ’s response to a
load transient is the time required to change the inductor
current. Small inductors in a multi-phase converter reduces
the response time without significant increases in total ripple
current.
The output inductor of each power channel controls the
ripple current. The control IC is stable for channel ripple
current (peak-to-peak) up to twice the average current. A
V IN – V OUT V OUT
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
single channel’s ripple current is approximately:
Δ I = -------------------------------- × ----------------
F SW xL V IN
1.0
(EQ. 7)
specific decoupling requirements.
Use only specialized low-ESR capacitors intended for
switching-regulator applications 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’s edge. In most cases, multiple capacitors of small
case size perform better than a single large case capacitor.
0.8
0.6
0.4
3 CHANNEL
SINGLE
CHANNEL
2 CHANNEL
Bulk capacitor choices include aluminum electrolytic, OS-Con,
Tantalum and even ceramic dielectrics. An aluminum
0.2
4 CHANNEL
electrolytic capacitor’s ESR value is related to the case size
with lower ESR available in larger case sizes. However, the
equivalent series inductance (ESL) of these capacitors
0
0
0.1
0.2 0.3
DUTY CYCLE (V O /V IN )
0.4
0.5
increases with case size and can reduce the usefulness of the
capacitor to high slew-rate transient loading. Unfortunately,
13
FIGURE 13. RIPPLE CURRENT vs DUTY CYCLE
FN9013.3
July 9, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6223EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| ISL6223EVAL2 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| ISL6224 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224CA | 功能描述:电流型 PWM 控制器 Mobile-Friendly RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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