參數(shù)資料
型號(hào)： SP6121
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)： 4/16頁(yè)
文件大小： 358K
代理商： SP6121
Date: 5/25/04
SP6121 Low Voltage, Synchronous Step Down PWM Controller Copyright 2004 Sipex Corporation
4
FUNCTIONAL DIAGRAM
+
-
-
+
-
+
Synchronous
Driver
PWM
Logic
S
Q
R
DReset
S
Q
R
ISET
V
CC
ISENSE
Reference
5
4
3
6
1.25V
UVLO
FAULT
GND
2
7
NDRV
8
DRIVER ENABLE
RESET
PWM COMP
FAULT
+
-
X 3.3
PDRV
PDRV
V
CC
5
μ
A
300mV
SHUTDOWN
ERAMP
Over Current
2.79V ON
2.69V OFF
30
μ
A
(3300 ppm/
°
C)
COMP
SHUTDOWN
F = 500kHz
750mV RAMP
S0.4V/ms
V
FB
COMP
1
-
+
-
+
1V
(33530mV
°
C)
+
-
General Overview
The SP6121 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 8-pin
solution.
The internal free-running oscillator accurately
sets the PWM frequency at 500kHz 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 reference
voltage. The output of the error amplifier
(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 effi-
ciency improvements. The SP6121 includes two
fast MOSFET drivers with internal non-overlap
circuitry and drives a complementary pair of
power transistors, P-channel on the high side,
and N-channel on the low side. The use of a P-
channel high side device minimizes complexity
and external component count by eliminating
the need for a charge pump that would otherwise
be required to fully enhance an N-channel de-
vice. It also allows inherent 100% duty cycle for
low dropout operation in the event of a low input
supply voltage condition.
The SP6121 includes an internal 0.4V/ms soft-
start circuit that provides controlled ramp up of
the output voltage, preventing overshoot and
inrush current at power up.
Current limiting is implemented by monitoring
the voltage drop across the R
DS(ON)
of the high
side P-channel MOSFET while it is conducting,
thereby eliminating the need for an external
sense resistor. The over-current comparator has
a built-in threshold of 160mV that can be pro-
grammed to higher values using a single exter-
nal resistor, connected to the I
SET
pin, whose
THEORY OF OPERATION
相關(guān)PDF資料
PDF描述
SP6121CN Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
SP6121EB Demo Board Manual
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SP6134 Dual Supply Synchronous Buck Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP612-10 制造商:Delphi Corporation 功能描述:TORSION SPRING
SP6121CN 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage, 8 Pin Synchronous, Cntrllr 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
SP6121CN/TR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage, 8 Pin Synchronous, Cntrllr 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
SP6121CN-L 功能描述:電壓模式 PWM 控制器 Low Voltage, 8 Pin Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
SP6121CN-L/TR 功能描述:電壓模式 PWM 控制器 Low Voltage, 8 Pin Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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