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參數(shù)資料
| 型號： | ZXRD1050PQ16TA |
| 英文描述： | IC-SM-DC/DC CONTROLLER |
| 中文描述： | IC-SM-DC/DC控制器 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 639K |
| 代理商： | ZXRD1050PQ16TA |
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10
Optimising for Transient Response.
Transient response is important in applications where
the load current increases and decreases rapidly. To
optimise the system for good transient response
certain criteria have to be observed.
The optimum solution using the ZXRD series uses the
adjustable N phase controller in synchronous mode as
represented in the diagram opposite. The external
networks for this solution require the use of the
adjustable controller option.
By using standard
’
bulk
’
capacitors in parallel with a
single OS-CON capacitor significant performance
versus cost advantage can be given in this application.
The low ESR of the OS-CON capacitor provides
competitive output voltage ripple at low capacitance
values. The
’
bulk
’
capacitors aid transient response.
However, the low ESR of the OS-CON capacitor can
cause instability within the system. To maintain
stability an RC network (R
X
, C
x
1) has to be
implemented. Furthermore, a capacitor in parallel with
R6 (C
x
2) is required to optimise transient response. To
do this the appropriate adjustable ZXRD must be used
because the input to the internal error amplifier (pin
16) has to be accessed. The adjustable device differs
from fixed controller versions in this respect. This
combined with a frequency compensation adjustment
gives an optimised solution for excellent transient
response.
Layout Issues
Layout is critical for the circuit to function in the most
efficient manner in terms of electrical efficiency,
thermal considerations and noise. The following
guidelines should be observed:
A 2.2 F (C8) decoupling capacitor should be as close
as possible to the drive MOSFETs and D1 anode. This
capacitor is effectively connected across V
IN
and G
ND
but should be as close as possible to the appropriate
components in either N or P, synchronous or
non-synchronous configurations. Furthermore the
G
ND
connection of the synchronous MOSFET/D1 and
output capacitors should be close together and use
either a ground plane or at the very least a low
inductance PCB track.
For the standard application circuits, a Gerber file can
be made available for the layout which uses the
materials as listed in the bill of materials table for the
reference designs.
Reference Designs.
In the following section reference circuits are shown for
the ZXRD series in both synchronous and
non-synchronous modes. These are shown for each of
the N and P phase controllers. In each case efficiency
graphs are shown for the appropriate configuration
using 3.3V and 5V ZXRD devices. The BOM is then
shown for the design. Additional and alternative
components are shown with a
’
*
’
. These refer to
modifications to the design to optimise for transient
response. Optimisation is reached using the adjustable
version of either N or P phase controller device.
ISSUE 3 - MAY 2000
ZXRD1000 SERIES
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ZXRD1050PQ16TC | 功能描述:DC/DC 開關控制器 - RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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:基準電壓& 基準電流 0.6V 0.2-18V 5-TERM ADJUSTABLE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度: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（導通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
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