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參數(shù)資料
| 型號： | NCP1014AP100 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | VARISTOR 150V RMS 7MM RADIAL |
| 中文描述： | 1 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDIP7 |
| 封裝： | PLASTIC, DIP-8/7 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 324K |
| 代理商： | NCP1014AP100 |
NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
http://onsemi.com
19
MOSFET Protection
As in any Flyback design, it is important to limit the
drain excursion to a safe value, e.g. below the MOSFET
BV
DSS
which is 700 V. Figure 27 presents possible
implementations:
Figure 27. Different Options to Clamp the Leakage Spike
+
NCP101X
CVcc
HV
1
8
2
3
4
7
5
+
CVcc
HV
Rclamp
Cclamp
D
1
8
2
3
4
7
5
+
CVcc
HV
D
1
8
2
3
4
7
5
C
Dz
A
B
C
NCP101X
NCP101X
Figure 27A
: The simple capacitor limits the voltage
according to Equation 15. This option is only valid for low
power applications, e.g. below 5.0 W, otherwise chances
exist to destroy the MOSFET. After evaluating the leakage
inductance, you can compute C with Equation 15. Typical
values are between 100 pF and up to 470 pF. Large
capacitors increase capacitive losses.
Figure 27B
: This diagram illustrates the most standard
circuitry called the RCD network. Rclamp and Cclamp are
calculated using the following formulas:
2 · Vclamp · (Vclamp
Lleak · Ip2· Fsw
Rclamp
(Vout
Vf sec) · N)
(eq. 27)
Cclamp
Vclamp
Vripple · Fsw · Rclamp
(eq. 28)
Vclamp is usually selected 5080 V above the reflected
value N x (Vout + Vf). The diode needs to be a fast one and
a MUR160 represents a good choice. One major drawback
of the RCD network lies in its dependency upon the peak
current. Worse case occurs when Ip and Vin are maximum
and Vout is close to reach the steadystate value.
Figure 27C
: This option is probably the most expensive of
all three but it offers the best protection degree. If you need
a very precise clamping level, you must implement a Zener
diode or a TVS. There are little technology differences
behind a standard Zener diode and a TVS. However, the die
area is far bigger for a transient suppressor than that of Zener.
A 5.0 W Zener diode like the 1N5388B will accept 180 W
peak power if it lasts less than 8.3 ms. If the peak current in
the worse case (e.g. when the PWM circuit maximum
current limit works) multiplied by the nominal Zener
voltage exceeds these 180 W, then the diode will be
destroyed when the supply experiences overloads. A
transient suppressor like the P6KE200 still dissipates 5.0 W
of continuous power but is able to accept surges up to 600 W
@ 1.0 ms. Select the Zener or TVS clamping level between
40 to 80 V above the reflected output voltage when the
supply is heavily loaded.
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