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參數資料
| 型號： | ISL6224CA |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Single Output Mobile-Friendly PWM Controller |
| 中文描述： | SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SSOP-16 |
| 文件頁數： | 10/13頁 |
| 文件大?。?/td> | 378K |
| 代理商： | ISL6224CA |
10
FN9042.7
December 28, 2004
Layout Considerations
MOSFETs switch very fast and efficiently. The speed with
which the current transitions from one device to another
causes voltage spikes across the interconnecting impedances
and parasitic circuit elements. The voltage spikes can
degrade efficiency, radiate noise into the circuit, and lead to
device overvoltage stress. Careful component layout and
printed circuit design minimizes the voltage spikes in the
converter. Consider, as an example, the turn-off transition of
one of the upper PWM MOSFETs. Prior to turn-off, the upper
MOSFET is carrying the full load current. During the turn-off,
current stops flowing in the upper MOSFET and is picked up
by the lower MOSFET. Any inductance in the switched
current path generates a voltage spike during the switching
interval. Careful component selection, tight layout of the
critical components, and short, wide circuit traces minimize
the magnitude of voltage spikes. See the Application Note
AN9983 for the evaluation board component placement and
the printed circuit board layout details.
There are two sets of critical components in a DC/DC
converter using an ISL6224 controller. The switching power
components are the most critical because they switch large
amounts of energy, and as such, they tend to generate
equally large amounts of noise. The critical small signal
components are those connected to sensitive nodes or
those supplying critical bias currents.
Power Components Layout Considerations
The power components and the controller IC should be
placed first. Locate the input capacitors, especially the high-
frequency ceramic decoupling capacitors, close to the power
MOSFETs. Locate the output inductor and output capacitors
between the MOSFETs and the load. Locate the PWM
controller close to the MOSFETs.
Insure the current paths from the input capacitors to the
MOSFETs, to the output inductors and output capacitors are
as short as possible with maximum allowable trace widths.
A multi-layer printed circuit board is recommended. Dedicate
one solid layer for a ground plane and make all critical
component ground connections with vias to this layer.
Dedicate another solid layer as a power plane and break this
plane into smaller islands of common voltage levels. The
power plane should support the input power and output
power nodes. Use copper filled polygons on the top and
bottom circuit layers for the phase nodes, but do not
unnecessarily oversize these particular islands. Since the
phase nodes are subjected to very high dV/dt voltages, the
stray capacitor formed between these islands and the
surrounding circuitry will tend to couple switching noise. Use
the remaining printed circuit layers for small signal wiring.
The wiring traces from the control IC to the MOSFET gate
and source should be sized to carry 2A peak currents.
Small Components Signal Layout Considerations
The Vin pin 1 input should be bypassed with a 1.0μF
capacitor. The bypass capacitors for Vin and the soft-start
capacitor, should be located close to their connecting pins on
the control IC.
Refer to the Application Note AN9983 for a recommended
component placement and interconnections.
Figures 5, 6 and 7 show application circuits for the three modes
of operation. Mode 1 is operating from battery voltage and
operating at 300kHz switching frequency. Mode 2 is operating
off of 5V and operating at 300kHz switching frequency. Mode 3
is operating off of 5V and operating at 600kHz switching
frequency.
ISL6224
相關PDF資料 |
PDF描述 |
|---|---|
| ISL6224CAZA | Single Output Mobile-Friendly PWM Controller |
| ISL6225CAZ | Dual Mobile-Friendly PWM Controller with DDR Memory Option |
| ISL6225CAZA-T | Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:22; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:22-34 RoHS Compliant: No |
| ISL6225CAZ-T | KJ SERIES II |
| ISL6225 | Dual Mobile-Friendly PWM Controller with DDR Memory Option(帶DDR存儲器選項的雙移動型PWM控制器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ISL6224CA-T | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數: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) |
| ISL6224CAZ | 功能描述:電流型 PWM 控制器 MOBILE PWM CNTRLR 16-PIN SSOP RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6224CAZA | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224CAZA-T | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224CAZ-T | 功能描述:電流型 PWM 控制器 MOBILE PWM CNTRLR 16-PIN SSOP RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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