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| 型号： | SP7656EN2-L |
| 厂商： | Exar Corporation |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 8HNSOIC |
| 标准包装： | 98 |
| 系列： | Power Blox™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 28 V |
| 输入电压： | 4.5 V ~ 29 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 3A |
| 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： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-HSOICN |
| 其它名称： | 1016-1443 SP7656EN2-L-ND |
Inductor Selection
Layout Suggestions
L ? ? Vin ? Vout ? ?
? ?
? ?
? ?
? ?
? Vout ? ? 1 ? ? 1 ?
Select the Inductor for inductance L and
saturation current I SAT . Make sure to select an
inductor with I SAT higher than the programmed
overcurrent level.
The inductance can be calculated from:
?
? Vin ? ? f ? ? Irip ?
where:
V IN is converter input voltage
V OUT is converter output voltage
f is the switching frequency (300kHz)
I RIP is inductor peak-to-peak current ripple
(nominally set to 30% of I OUT )
Keep in mind that a higher inductor ripple
current results in a smaller inductance – and
smaller inductor. A smaller inductor has the
advantages of small size, low DC equivalent
resistance DCR, high saturation current and
allows the use of a lower output capacitance
to meet a given step load transient. A higher
inductor ripple current level also has
disadvantages. It increases the output voltage
ripple and increases the current at which
converter enters Discontinuous Conduction
Mode. The output current at which converter
enters DCM is ? of I RIP . Note that a negative
current step load that drives the converter into
DCM will result in a large output voltage
transient. Therefore the lowest current for a
step load should be larger than ? of I RIP .
Restriction on high duty cycle operation
i)
ii)
iii)
iv)
v)
Place the input capacitor(s) as close
as possible to the 7656 IC.
Create a pad under the IC that
connects the power pad (pin 9) to the
inductor. Duplicate this pad through
the pcb layers if present, and on the
bottom side of the PCB. Use multiple
vias to connect these layers to aid in
heat dissipation. Do not oversize this
pad - since the LX node is subjected
to very high dv/dt voltages, the stray
capacitance formed between these
islands and the surrounding circuitry
will tend to couple switching noise
Connect the Schottky diode cathode
as close as possible to the LX node
and inductor input side. Connect the
anode to a large diameter trace or a
copper area that connects the input
ground to the output ground.
The output capacitors should be
placed as close to the load as
possible. Use short wide copper
regions to connect output capacitors
to load to avoid inductance and
resistances.
Keep other sensitive circuits and
traces away from the LX node in
particular and away from the power
supply completely if possible.
The SP7656 is optimized to provide superior
performance for low duty cycle applications.
For applications with output voltages below
9V, the device will operate normally at the
expected 600kHz switching frequency for
conversions with less than 50% duty cycle.
For applications with output voltages below 9V
and greater than 50% duty cycle, the device
will enter into a pulse skipping mode. This is
due to the FB voltage to internal ramp voltage
ratio of the device, and is an intended
behavior from an architecture optimized for
superior performance in low duty cycle
conversion applications and results in a small
increase in output ripple voltage for any given
circuit. For output voltages above 9V, the
device will operate at a constant 600kHz
switching frequency across the specified duty
cycle range up to 100%.
11/07/08 SP7656 PowerBlox
7
Diode
Cin 7656 Cout
Lout
For more detail on the SP7656 layout see the
SP7656EVB (Evaluation Board) Manual
available on our web site. Each layer is shown
in detail as well as a complete bill of materials
and performance characterization.
? Copyright 2008 EXAR Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7656EN2-L/TR | 功能描述:开关变换器、稳压器与控制器 600KHZ HIGH INPUT NON-SYNC STEP DWN RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SP7661 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7661_07 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 3A, 600kHz, Buck Regulator |
| SP7661_1 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7661EB | 功能描述:电源管理IC开发工具 Eval Board for SP7661 Series RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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