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參數(shù)資料
| 型號(hào)： | NCP1381 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low−Standby High Performance PWM Controller |
| 文件頁(yè)數(shù)： | 20/26頁(yè) |
| 文件大小： | 559K |
| 代理商： | NCP1381 |
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NCP1381
http://onsemi.com
20
+
IN
Current
V(CMP)
P
Spice
:
EB
load
Value
Figure 30. A Simple Simulation Configuration Helps to Tailor the Right Value for C
fil
+B1
Voltage
2
3
V
(line)
V
(timing)
B
load
3
35
V(bulk)
: 0
IF (V(CMP)
3,
V(35
+
+
+
+
C
fil
220 n
R
upper
R
lower
Bulk
Line
Timing
V2
V1
C
bulk
47 F
I
C
= 40
TiCMP
P
Spice
:
EB
brown
Value
{IF (V(CMP)
3, 250 m, 0)}
V
(CMP)
3 250 m : 500 m
B
brown
Voltage
5
Brown Out
Bulk
V
load
V1 Timing 0 PWL 0 0.2 3s 1 7s 1 10s 0.2
V2 Line 0 SIN 150 50
Figure 31. Typical Signals Obtained from the Simulator
0
4
8
12
16
200
100
0
100
200
8.156
8.175
8.195
8.215
8.235
Turnoff Voltage Occurs at:
V
inRMS
= 72.3 V
V
brownout
Brownout internal circuit
Given the low startup current and the weak overall consumption of the controller, a circuit needs to be found in order to create
a hiccup mode when there is not enough mains detected on Pin 2. Figure 32 portrays the solution based on a 1mA current
source, solely activated when the V
CC
is going low and the BOK has not authorized the controller to pulse. This 1 mA actually
discharges the V
CC
capacitor to make V
CC
reach 10 V. At this point, the source goes to zero and the startup resistor replenishes
the V
CC
capacitor. When we reach 15 V, the logic checks whether the BOK gives the green light. If not, V
CC
goes low via the
1 mA. The logic arrangement is made in such a way that if the mains comes back asynchronously to V
CC
(e.g. in the downslope
or in the upslope), we always restart at V
CC
= 15 V. Figure 33 shows a simulated behavior with a mains going up and down.
Figure 34 and 35 confirm the good restart synchronization with the 15 V level.
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