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參數(shù)資料
| 型號： | NCP5331 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Two-Phase PWM Controller with Integrated Gate Drivers |
| 中文描述： | 兩相PWM控制器，帶有集成門極驅(qū)動器 |
| 文件頁數(shù)： | 19/38頁 |
| 文件大?。?/td> | 424K |
| 代理商： | NCP5331 |
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NCP5331
http://onsemi.com
19
Figure 22. NCP5331 Prevents Overvoltage at 0 A
NOTE:
The NCP5331 maintains V
CORE
< 2.2 V when an
upper MOSFET shorts during no-load operation.
Figure 23. NCP5331 Prevents Overvoltage at 45 A
NOTE:
The NCP5331 maintains V
CORE
< 2.2 V when an
upper MOSFET shorts with 45 A loading.
If the voltage feedback signal (COREFB+) is accidentally
grounded (but V
CORE
is not), the error amplifier will respond
by increasing the duty cycle. Of course, this will cause V
CORE
to rise. When V
CORE
reaches 2.0 V, the internal crowbar
circuit will be activated and the overcurrent/overvoltage latch
will be set. This latch will discharge COMP, turn OFF the
upper MOSFETs, and turn ON the lower MOSFETs. The
overcurrent/overvoltage latch will hold the controller in this
state until the input power is cycled.
Transient Response and Adaptive Positioning
For applications with fast transient currents the output
filter is frequently sized larger than ripple currents require in
order to reduce voltage excursions during load transients.
Adaptive voltage positioning can reduce peak-to-peak
output voltage deviations during load transients and allow
for a smaller output filter. The output voltage can be set
higher than nominal at light loads to reduce output voltage
sag when the load current is applied. Similarly, the output
voltage can be set lower than nominal during heavy loads to
reduce overshoot when the load current is removed. For low
current applications a droop resistor can provide fast
accurate adaptive positioning. However, at high currents the
loss in a droop resistor becomes excessive. For example; in
a 50 A converter a 1 m
resistor to provide a 50 mV change
in output voltage between no load and full load would
dissipate 2.5 W.
Lossless adaptive positioning is an alternative to using a
droop resistor, but must respond to changes in load current.
Figure 25 shows how adaptive positioning works. The
waveform labeled “Normal” shows a converter without
adaptive positioning. On the left, the output voltage sags
when the output current is stepped up and later overshoots
when current is stepped back down. With fast (ideal)
adaptive positioning the peak to peak excursions are cut in
half. In the slow adaptive positioning waveform the output
voltage is not repositioned quickly enough after current is
stepped up and the upper limit is exceeded.
Figure 24. NCP5331 Prevents Overvoltage at Startup
NOTE:
The NCP5331 maintains V
CORE
< 2.2 V when an
upper MOSFET is shorted and ATX power is applied.
Adaptive Positioning
Limits
Adaptive Positioning
Normal
Fast
Slow
Figure 25. Adaptive Positioning
The controller can be configured to adjust the output
voltage based on the output current of the converter. (Refer
to the application schematic in Figure 1). To set the no-load
positioning, a resistor is placed between the output voltage
and V
FB
pin. The V
FB
bias current will develop a voltage
across the resistor to adjust the no-load output voltage. The
V
FB
bias current is dependent on the value of R
OSC
as shown
in the data sheets.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 開關控制器 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 |
| NCP5331FTR2G | 功能描述:DC/DC 開關控制器 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 |
| NCP5332A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase Buck Controller with Integrated Gate Drivers and 5-Bit DAC |
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