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参数资料
| 型号： | NCP1652L48VGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 22/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 100W 48V NCP1652 PFC |
| 产品变化通告： | 1Q2012 Discontinuation 30/Mar/2012 |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | NCP1652L48VGEVB-ND NCP1652L48VGEVBOS |
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NCP1652, NCP1652A
V CC
V CC(on)
V CC(off)
t
OUTA
t
Fault Timer
(internal)
Overload
applied
t
t OVLD
Figure 58. V CC Double Hiccup Operation with a Fault Occurring while the Startup Circuit is Disabled
An internal supervisory circuit monitors the V CC voltage
to prevent the controller from dissipating excessive power
if the V CC pin is accidentally grounded. A lower level
current source (I inhibit ) charges C CC from 0 V to V inhibit ,
typically 0.85 V. Once V CC exceeds V inhibit , the startup
current source is enabled. This behavior is illustrated in
Figure 59. This slightly increases the total time to charge
V CC , but it is generally not noticeable.
Figure 59. Startup Current at Various V CC Levels
The rectified ac line voltage is provided to the power stage
to achieve accurate PFC. Filtering the rectified ac line
voltage with a large bulk capacitor distorts the PFC in a
single stage PFC converter. A peak charger is needed to bias
the HV pin as shown in Figure 60. Otherwise, the HV pin
follows the ac line and the startup circuit is disabled every
time the ac line voltage approaches 0 V. The V CC capacitor
is sized to bias the controller during power up.
http://onsemi.com
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