參數(shù)資料
型號(hào)： NCP5322ADWR2G
廠商： ON SEMICONDUCTOR
元件分類： 穩(wěn)壓器
英文描述： Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC
中文描述： 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28
封裝： LEAD FREE, SOIC-28
文件頁(yè)數(shù)： 24/31頁(yè)
文件大?。?/td> 726K
代理商： NCP5322ADWR2G
NCP5322A
http://onsemi.com
24
Figure 22. V
DRP
Tuning Waveforms. The RC Time
Constant of the Current Sense Network Is Optimal:
V
DRP
and V
OUT
Respond to the Load Current Quickly
Without Overshooting.
For resistive current sensing, choose the current sense
network (R
CSn
, C
CSn
, n = 1 or 2) to satisfy
RCSn
CCSn
Lo (Rsense)
(33)
This will provide an adequate starting point for R
CSn
and
C
CSn
. After the converter is constructed, the value of R
CSn
(and/or C
CSn
) should be finetuned in the lab by observing
the V
DRP
signal during a step change in load current. The
R
CSn
C
CSn
network should be tuned to provide a
“squarewave” at the V
DRP
output pin with maximum rise
time and minimal overshoot as shown in Figure 22.
Equation 32 will be most accurate for better iron powder
core material (such as the 8 from Micrometals). This
material is very consistent with DC current and frequency.
Less expensive core materials (such as the 52 from
Micrometals) change their characteristics with DC current,
AC flux density, and frequency. This material will yield
acceptable converter performance if the current sense time
constant is set lower (longer) than anticipated. As a rule of
thumb, use approximately twice the resistance (R
CSn
) or
twice the capacitance (C
CSn
) when using the less expensive
core material.
8. Error Amplifier Tuning
After the steadystate (static) AVP has been set and the
current sense network has been optimized the Error
Amplifier must be tuned. Basically, the gain of the Error
Amplifier should be adjusted to provide an acceptable
transient response by increasing or decreasing the Error
Amplifier’s feedback capacitor (C
AMP
in the Applications
Diagram). The bandwidth of the control loop will vary
directly with the gain of the error amplifier.
Figure 23. The Value of C
AMP
Is Too High and the
Loop Gain/Bandwidth Too Low. COMP Slews Too
Slowly Which Results in Overshoot in V
OUT
.
If C
AMP
is too large the loop gain/bandwidth will be low,
the COMP pin will slew too slowly, and the output voltage
will overshoot as shown in Figure 23. On the other hand, if
C
AMP
is too small the loop gain/bandwidth will be high, the
COMP pin will slew very quickly and overshoot. Integrator
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NCP5331 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase PWM Controller with Integrated Gate Drivers
NCP5331/D 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two Phase PWM Controller with Integrated Gate Drivers
NCP5331_05 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase PWM Controller with Integrated Gate Drivers
NCP5331FTR2 功能描述:DC/DC 開(kāi)關(guān)控制器 2 Phase Buck w/Gate 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
NCP5331FTR2G 功能描述:DC/DC 開(kāi)關(guān)控制器 2 Phase Buck w/Gate Drivers for Athlon 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
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