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| 型号： | ISL8540IVEZ |
| 厂商： | Intersil |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 20HTSSOP |
| 标准包装： | 74 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.21 V ~ 35 V |
| 输入电压： | 9 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 100kHz ~ 600kHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-TSSOP-EP |
| 产品目录页面： | 1248 (CN2011-ZH PDF) |
ISL8540
A more detailed explanation of voltage mode control of a
buck regulator can be found in Tech Brief TB417, titled
“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
A multi-layer printed circuit board is recommended.
Figure 30 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 LX 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 LX nodes. Use the remaining printed
circuit layers for small signal wiring.
design minimizes these voltage spikes.
In order to dissipate heat generated by the internal LDO and
As an example, consider the turn-off transition of the control
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 freewheeling 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.
other power components, the ground pad at the bottom of
the device should be connected to the ground plane through
at least nine 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
ISL8540 first. Minimize the length of the connections
between the input capacitors, C IN . Make the PGND and the
output capacitors as short as possible.
There are two sets of critical components in the ISL8540
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.
V IN
VIN
C IN
ISL8540
NOTE: It is recommended that any applications with input
voltage greater than 30VDC should be polymer coated to
meet Intersil’s IPC-2221 creepage and clearance
specification.
L
V OUT1
C BP2
VCC5
LX
D
C OUT1
COMP
C 6
PGND
FB
R 4
C 10
R 2
R 3
C 7
R 6
GND PAD
KEY
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT AND/OR POWER PLANE LAYER
VIA CONNECTION TO GROUND PLANE
FIGURE 30. PRINTED CIRCUIT BOARD POWER PLANES AND
ISLANDS
15
FN6495.5
September 9, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8540IVEZ-T | 功能描述:IC REG BUCK SYNC ADJ 2A 20HTSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
| ISL85410FRZ | 制造商:Intersil Corporation 功能描述:36VIN 1A SYNCHRONOUS SWITCHING REGULATOR- 4X3 12LD DFN PB-FR - Rail/Tube 制造商:Intersil Corporation 功能描述:IC REG BUCK SYNC ADJ 1A 12DFN |
| ISL85410FRZ-T | 制造商:Intersil Corporation 功能描述:36VIN 1A SYNCHRONOUS SWITCHING REGULATOR 4X3 12LD DFN T&R - Tape and Reel 制造商:Intersil Corporation 功能描述:IC REG BUCK SYNC ADJ 1A 12DFN |
| ISL85410FRZ-T7A | 制造商:Intersil Corporation 功能描述:IC REG BUCK SYNC ADJ 1A 12DFN |
| ISL85412FRTZ | 制造商:Intersil Corporation 功能描述:36VIN 150MA SYNCHRONOUS SWITCHING REGULATOR- 3X3 8LD TDFN PB - Tape and Reel |
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