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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 |
| 文件頁數(shù)： | 8/26頁 |
| 文件大小： | 559K |
| 代理商： | NCP1381 |
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NCP1381
http://onsemi.com
8
Figure 5. A Typical Startup Sequence Followed by a Faulty Condition
Startup Resistor Calculation
For the sake of the example, we will go through the
calculation of the startup element. Suppose that we have the
following information:
VCC
ON
= 15 V.
VCC
OFF
= 10 V.
I
CC2
= 4 mA, given by the selected MOSFET Q
g
.
Startup duration below 2 s at minimum input voltage.
Input voltage from 85 VAC to 265 VAC.
Standby power below 500 mW.
1. From a startup V of 15 10 = 5 V and a 4 mA
total consumption, we can obtain the necessary
V
CC
capacitor to keep enough voltage, assuming
the feedback loop is closed within 10ms: CV
CC
=
4 m x 10 m / 5 = 8 F or 22 F for the normalized
value if we account for the natural dispersion.
2. If we want a startup below 2 s, then the charging
current flowing inside the V
CC
capacitor must be
above: I
charge
> 15 x 22 u / 2 > 165 A. If we add
the 15 A of I
CC1
, the total startup current shall be
above 180 A.
3. The minimum input voltage is 85 x 1.414 = 120 V.
Then, R
startup
should be below (120 15) / 180
< 580 k .
4. From this value, we can calculate the dissipated
power at high line: P
startup
= (265 x 1.414)
2
/ 580 k
= 242 mW.
In latched mode, an internal zener diode is activated and
clamps V
CC
to around 6 V. When V
CC
goes below 4 V, this
zener is relaxed and the circuit can startup again.
Please note that in fault mode the V
CC
comparator has the
priority and stops the pulses anytime V
CC
falls below its
minimum operating level VCC
OFF
.
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