参数资料
| 型号： | NCP5331FTR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/36页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM 2PH W/DRVRS 32-LQFP |
| 产品变化通告： | Product Obsolescence 05/Oct/2010 |
| 标准包装： | 1 |
| 应用： | 控制器，AMD Athlon? |
| 输入电压： | 9 V ~ 14 V |
| 输出数： | 2 |
| 输出电压： | 5V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP5331FTR2GOSCT |
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NCP5331
NOTE:
The NCP5331 maintains V CORE < 2.2 V when an
NOTE:
The NCP5331 maintains V CORE < 2.2 V when an
upper MOSFET shorts during no?load operation.
Figure 22. NCP5331 Prevents Overvoltage at 0 A
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
upper MOSFET shorts with 45 A loading.
Figure 23. NCP5331 Prevents Overvoltage at 45 A
output voltage deviations during load transients and allow
NOTE:
The NCP5331 maintains V CORE < 2.2 V when an
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 W 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.
upper MOSFET is shorted and ATX power is applied.
Figure 24. NCP5331 Prevents Overvoltage at Startup
Normal
Fast Adaptive Positioning
Slow Adaptive Positioning
Limits
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.
http://onsemi.com
19
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