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参数资料
| 型号： | NCP1927DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/24页 |
| 文件大小： | 531K |
| 描述： | IC CTLR PFC/FLYBACK 16-SOIC |
| 标准包装： | 2,500 |
| 系列： | * |
NCP1927
http://onsemi.com
11
Figure 3. Operation with Dual V
CC
Capacitors
I
CC
R
start
D1
D2
C1
C2
V
in
Aux Winding
V
CC
NCP1927
+
+
Figure 4. Startup Sequence of the NCP1927
Time
PDRV
FDRV
Time
V
CC(on)
V
CC(off)
V
CC(reset)
0 V
Time
I
CC5
I
CC3
+
ICC(FDRV)
I
CC1
+I
CC(FDRV)
+I
CC(PDRV)
V
CC
DRV
I
CC
PDRV
FDRV
FAULT MANAGEMENT
When the NCP1927 detects a nonlatching fault
(Shutdown Mode, TSD, and Flyback Overload), the drivers
are disabled, and V
CC
falls towards V
CC(off)
due to the IC
internal current consumption. Once V
CC
falls below
V
CC(off)
, the fault is reset and the IC internal current
consumption is reduced to the startup current, I
CC5
. V
CC
begins to rise as if power was initially applied and the device
resumes normal operation once V
CC
reaches V
CC(on)
. This
cycle between V
CC(on)
and V
CC(off)
is commonly referred to
as a V
CC
hiccup and is shown in Figure 5.
Figure 5. V
CC
During a V
CC
Hiccup
time
V
CC
time
DRV
VCC
ON
VCC
OFF
Device
Restarts
Fault
Occurs
Fault is Reset
time
ICC
ICC
4
ICC
5
ICC2
SHUTDOWN PIN
The Shutdown pin allows for external disabling of the
NCP1927. When V
Shutdown
is pulled above the shutdown
threshold, V
SHDN
(typically 1.0 V), both the flyback and
PFC drive outputs are immediately turned off, and a V
CC
hiccup occurs (see Figure 5). When V
CC
reaches V
CC(on)
,
the cycle repeats unless the NCP1927 is taken out of
shutdown. This is achieved when V
Shutdown
becomes less
than V
SHDN
. The NCP1927 leaves shutdown mode and will
start when V
CC
reaches V
CC(on)
according to the initial
poweron sequence. The V
CC
behavior during shutdown
mode is shown in Figure 6.
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