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參數(shù)資料
| 型號： | ISL8500 |
| 廠商： | Intersil Corporation |
| 英文描述： | Switching Regulator Control (Voltage Mode type AC/DC) ; Vin (V) max.: 10 to 35; Icc (mA) max.: 15; Fmax (kHz) max.: 500; Topr [Tjopr] (°C): -30 to +85; Remarks: Primary control MOSFET drive; Package: SOP; Pin count: 20 |
| 中文描述： | 甲標準降壓PWM穩(wěn)壓器 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 622K |
| 代理商： | ISL8500 |
14
FN6611.0
December 10, 2007
A more detailed explanation of voltage mode control of a
buck regulator can be found in TB417, entitled “Designing
Stable Compensation Networks for Single Phase Voltage
Mode Buck Regulators.”
Layout Considerations
Layout is very important in high frequency switching
converter design. With power devices switching efficiently
between 100kHz and 600kHz, the resulting current
transitions from one device to another cause voltage spikes
across the interconnecting impedances and parasitic circuit
elements. These voltage spikes can degrade efficiency,
radiate noise into the circuit, and lead to device overvoltage
stress. Careful component layout and printed circuit board
design minimizes these voltage spikes.
As an example, consider the turn-off transition of the upper
MOSFET. Prior to turn-off, the MOSFET is carrying the full load
current. During turn-off, current stops flowing in the MOSFET
and is picked up by the Schottky diode. Any parasitic
inductance in the switched current path generates a large
voltage spike during the switching interval. Careful component
selection, tight layout of the critical components, and short, wide
traces minimizes the magnitude of voltage spikes.
There are two sets of critical components in the ISL8500
switching converter. The switching components are the most
critical because they switch large amounts of energy, and
therefore tend to generate large amounts of noise. Next are
the small signal components, which connect to sensitive
nodes or supply critical bypass current and signal coupling.
A multi-layer printed circuit board is recommended. Figure 23
shows the connections of the critical components in the
converter. Note that capacitors C
IN
and C
OUT
could each
represent numerous physical capacitors. Dedicate one solid
layer, usually a middle layer of the PC board, 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. Keep the metal runs from the PHASE terminals
to the output inductor short. 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. Use the remaining printed circuit layers for small signal
wiring.
In order to dissipate heat generated by the internal LDO and
MOSFET, the ground pad, pin 13, should be connected to
the internal ground plane through at least four vias. This
allows the heat to move away from the IC and also ties the
pad to the ground plane through a low impedance path.
The switching components should be placed close to the
ISL8500 first. Minimize the length of the connections
between the input capacitors, C
IN
, and the power switches
by placing them nearby. Position both the ceramic and bulk
input capacitors as close to the upper MOSFET drain as
possible. Position the output inductor and output capacitors
between the upper and Schottky diode and the load.
The critical small signal components include any bypass
capacitors, feedback components, and compensation
components. Place the PWM converter compensation
components close to the FB and COMP pins. The feedback
resistors should be located as close as possible to the FB
pin with vias tied straight to the ground plane as required.
VIN
VDD
ISL8500
PHASE
GND
COMP
FB
GND PAD
R
4
R
3
C
3
R
1
C
1
C
2
R
2
C
OUT1
V
OUT1
C
IN
V
IN
L
C
BP1
5V
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT AND/OR POWER PLANE LAYER
VIA CONNECTION TO GROUND PLANE
KEY
L
D
FIGURE 23. PRINTED CIRCUIT BOARD POWER PLANES AND
ISLANDS
ISL8500
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL8500IRZ | Switching Regulator Control (Voltage Mode type AC/DC) ; Vin (V) max.: 10 to 35; Icc (mA) max.: 15; Fmax (kHz) max.: 500; Topr [Tjopr] (°C): -30 to +85; Remarks: Primary control MOSFET drive; Package: DIP; Pin count: 16 |
| ISL8502 | 2.5A Synchronous Buck Regulator with Integrated MOSFETs |
| ISL8502IRZ | 2.5A Synchronous Buck Regulator with Integrated MOSFETs |
| ISL8560MREP | DC/DC Power Switching Regulator |
| ISL8560 | DC/DC Power Switching Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL85001EVAL1Z | 功能描述:EVALUATION BOARD FOR ISL85001 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL85001IRZ | 功能描述:IC REG BUCK ADJ 1A 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:1 系列:EZBuck™ 類型:降壓（降壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:0.8 V ~ 22.1 V 輸入電壓:3 V ~ 26 V PWM 型:電流模式 頻率 - 開關(guān):1.5MHz 電流 - 輸出:1.8A 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:8-DFN（2x2） 其它名稱:785-1276-1 |
| ISL85001IRZ-T | 功能描述:IC REG BUCK ADJ 1A 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| ISL8500EVAL1Z | 功能描述:EVALUATION BOARD FOR ISL8500 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL8500EVAL2Z | 功能描述:EVAL BOARD 2 FOR ISL8500 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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