參數(shù)資料
型號(hào)： ZXRD1050PQ16TA
英文描述： IC-SM-DC/DC CONTROLLER
中文描述： IC-SM-DC/DC控制器
文件頁(yè)數(shù)： 5/28頁(yè)
文件大?。?/td> 639K
代理商： ZXRD1050PQ16TA
DETAILED DESCRIPTION
The ZXRD1000 series can be configured to use either
N or P channel MOSFETs to suit most applications.
The most popular format, an all N channel
synchronous solution gives the optimum efficiency. A
feature of the ZXRD1000 series solution is the unique
method of generating the synchronous drive, called
SimpleSync
. Most solutions use an additional
output from the controller, inverted and delayed from
the main switch drive. The ZXRD1000 series solution
uses a simple overwinding on the main choke (wound
on the same core at no real cost penalty) plus a small
ferrite bead . This means that the synchronous FET is
only enhanced when the main FET is turned off. This
reduces the
‘
blanking period
’
required for shoot-
through protection, increasing efficiency and allowing
smaller catch diodes to be used, making the controller
simpler and less costly by avoiding complex timing
circuitry. Included on chip are numerous functions that
allow flexibility to suit most applications. The nominal
switching frequency (200kHz) can be adjusted by a
simple timing capacitor, C3. A low battery detect circuit
is also provided. Off the shelf components are available
from major manufacturers such as Sumida to provide
either a single winding inductor for non-synchronous
applications or a coil with an over-winding for
synchronous applications. The combination of these
switching characteristics, innovative circuit design and
excellent user flexibility, make the ZXRD1000 series
DC-DC solutions some of the smallest and most cost
effective and electrically efficient currently available.
Using Zetex
’
s HDMOS low R
DS(on)
devices, ZXM64N02X
for the main and synchronous switch, efficiency can
peak at upto 95% and remains high over a wide range
of operating currents. Programmable soft start can also be
adjusted via the capacitor, C7, in the compensation loop.
What is SimpleSync
TM
Conventional Methods
In the conventional approach to the synchronous
DC-DC solution, much care has to be taken with the
timing constraints between the main and synchronous
switching devices. Not only is this dependent upon
individual MOSFET gate thresholds (which vary from
device to device within data sheet limits and over
temperature), but it is also somewhat dependent upon
magnetics, layout and other parasitics. This normally
means that significant
‘
dead time
’
has to be factored
in to the design between the main and synchronous
devices being turned off and on respectively.
Incorrect application of dead time constraints can
potentially lead to catastrophic short circuit conditions
between V
IN
and G
ND
. For some battery operated
systems this can not only damage MOSFETs, but also
the battery itself. To realise correct
‘
dead time
’
implementation takes complex circuitry and hence
implies additional cost.
The ZETEX Method
Zetex has taken a different approach to solving these
problems. By looking at the basic architecture of a
synchronous converter, a novel approach using the
main circuit inductor was developed. By taking the
inverse waveform found at the input to the main
inductor of a non-synchronous solution, a
synchronous drive waveform can be generated that is
always relative to the main drive waveform and
inverted with a small delay. This waveform can be
used to drive the synchronous switch which means no
complex circuitry in the IC need be used to allow for
shoot-through protection.
Implementation
Implementation was very easy and low cost. It simply
meant peeling off a strand of the main inductor
winding and isolating it to form a coupled secondary
winding. These are available as standard items
referred to in the applications circuits parts list.The use
of a small, surface mount, inexpensive
’
square loop
’
ferrite bead provides an excellent method of
eliminating shoot-through due to variation in gate
thresholds. The bead essentially acts as a high
impedance for the few nano seconds that
shoot-through would normally occur. It saturates very
quickly as the MOSFETs attain steady state operation,
reducing the bead impedance to virtually zero.
Benefits
The net result is an innovative solution that gives
additional benefits whilst lowering overall
implementation costs. It is also a technique that can
be simply omitted to make a non-synchronous
controller, saving further cost, at the expense of a few
efficiency points.
5
ZXRD1000 SERIES
ISSUE 3 - MAY 2000
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZXRD1050PQ16TC 功能描述:DC/DC 開(kāi)關(guān)控制器 - RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
ZXRE060 制造商:DIODES 制造商全稱:Diodes Incorporated 功能描述:0.6V ADJUSTABLE PRECISION SHUNT REGULATOR
ZXRE060AET5TA 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 0.6V 0.2-18V 5-TERM ADJUSTABLE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel
ZXRE060AET5TA-CUT TAPE 制造商:DIODES 功能描述:ZXRE060A Series 0.2 - 18 V Adjustable ?.5 % Precision Shunt Regulator-TSOT-23-5
ZXRE060AFT4-7 功能描述:MOSFET Shunt Reference X2-D X2-DFN2015-6 T&R 3K RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:Max247 封裝:Tube
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