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參數(shù)資料
| 型號(hào)： | SP6128ACY |
| 英文描述： | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| 中文描述： | 低電壓，為第2A同步降壓PWM控制器的理想下至10A，占地面積小，DC - DC電源轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大?。?/td> | 135K |
| 代理商： | SP6128ACY |
4
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller Copyright 2005 Sipex Corporation
General Overview
The SP6128A is a constant frequency, voltage
mode, synchronous PWM controller designed
for low voltage, DC/DC step down converters.
It is intended to provide complete control for a
high power, high efficiency, precisely regulated
output voltage from a highly integrated 14-pin
solution.
The internal free-running oscillator accurately
sets the PWM frequency at 300kHz without
requiring any external elements and allows the
use of physically small, low value external com-
ponents without compromising performance. A
transconductance amplifier is used for the error
amplifier, which compares an attenuated sample
of the output voltage with a precision, 0.8V
reference voltage. The output of the error ampli-
fier (COMP), is compared to a 0.75V peak-to-
peak ramp waveform to provide PWM control.
The COMP pin provides access to the output of
the error amplifier and allows the use of external
components to stabilize the voltage loop.
High efficiency is obtained through the use of
synchronous rectification. Synchronous regula-
tors replace the catch diode in the standard buck
converter with a low R
DS(ON)
N-channel
MOSFET switch allowing for significant ef-
ficiency improvements. The SP6128A in-
cludes two fast MOSFET drivers with inter-
nal non-overlap circuitry and drives a pair of
N-channel power transistors. The SP6128A
includes an internal 0.27V/ms soft-start cir-
cuit that provides controlled ramp up of the
output voltage, preventing overshoot and in-
rush current at power up.
Current limiting is implemented by monitoring
the voltage drop across the R
DS(ON)
of the high
side N-channel MOSFET while it is conducting,
thereby eliminating the need for an external
sense resistor. The overcurrent threshold can be
programmed by a single resistor.
FUNCTIONAL DIAGRAM
+
-
-
+
-
+
Synchronous
Driver
PWM
Logic
S
Q
R
Reset
Dominant
R
Q
S
V
CC
SWN
Reference
6
10
0.8V
UVLO
FAULT
SWN
12
1 GL
13
DRIVER ENABLE
RESET
Dominant
PWM COMP
FAULT
GH
GH
5
μ
A
350mV
SHUTDOWN
ERGM
AMP
Over Current
2.8V ON
2.7V OFF
COMP
SHUTDOWN
F = 300kHz
750mV RAMP
0.27V/ms
SOFTSTART
V
FB
COMP
3
-
+
-
+
1V
+
-
GND
5
14 BST
I
SET
15
μ
A
2 PV
CC
11
PGND
4
OPERATION
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PDF描述 |
|---|---|
| SP6128AHY | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
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| SP6132EU-L | Wide Input, 300KHz Synchronous PWM Controller |
| SP6132HEU-L | High Voltage Synchronous Buck Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6128ACY/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128ACY-L | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage Synchronous Step Dwn RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6128ACY-L/TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage Synchronous Step Dwn RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6128AEY | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128AEY/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
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