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| 型號： | SP7655 |
| 英文描述： | Wide Input Voltage Range 8A, 300kHz, Buck Regulator |
| 中文描述： | 寬輸入電壓范圍8A條，300kHz的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 121K |
| 代理商： | SP7655 |
4
Date: 08/17/04
SP7655 Wide Input Voltage Range 8A, 300kHz, Buck Regulator Copyright 2004 Sipex Corporation
General Overview
The SP7655 is a fixed frequency, voltage mode,
synchronous PWM regulator optimized for high
efficiency. The part has been designed to be
especially attractive for high voltage applica-
tions utilizing 5V to power the controller and
2.5V to 28V for step down conversion.
The heart of the SP7655 is a wide bandwidth
transconductance amplifier designed to accom-
modate Type II and Type III compensation
schemes. A precision 0.8V reference, present on
the positive terminal of the error amplifier per-
mits the programming of the output voltage
down to 0.8V via the V
FB
pin. The output of the
error amplifier, COMP, compared to a 1.1V
peak-to-peak ramp is responsible for trailing
edge PWM control. This voltage ramp, and
PWM control logic are governed by the internal
oscillator that accurately sets the PWM fre-
quency to 300kHz.
THEORY OF OPERATION
The SP7655 contains two unique control fea-
tures that are very powerful in distributed appli-
cations. First, asynchronous driver control is
enabled during start up, to prohibit the low side
switch from pulling down the output until the
high side switch has attempted to turn on. Sec-
ond, a 100% duty cycle timeout ensures that the
low side switch is periodically enhanced during
extended periods at 100% duty cycle. This guar-
antees the synchronized refreshing of the BST
capacitor during very large duty ratios.
The SP7655 also contains a number of valuable
protection features. Programmable V
IN
UVLO
allows the user to set the exact value at which the
conversion voltage can safely begin down con-
version, and an internal V
CC
UVLO which en-
sures that the controller itself has enough volt-
age to properly operate. Other protection fea-
PIN DESCRIPTION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP7655_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7655_07 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Wide Input Voltage Range, 8Amp 300kHz, Buck Regulator |
| SP7655EB | 功能描述:電源管理IC開發(fā)工具 Eval Board for SP7655 Series RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| SP7655ER | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7655ER/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Wide Input Voltage Range, 8Amp 300kHz, Buck Regulator |
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