參數(shù)資料
型號(hào)： AN-937
廠商： Electronic Theatre Controls, Inc.
英文描述： Gate Drive Characteristics and Requirements for HEXFET
中文描述： 門驅(qū)動(dòng)器的特點(diǎn)及要求的HEXFET
文件頁(yè)數(shù)： 9/21頁(yè)
文件大小： 418K
代理商： AN-937
AN-937 (v.Int)
The auxiliary supply for the optocoupler and its associated circuitry can be developed from the drain voltage of the MOSFET
itself, as shown in Figure 17, 18 and 19. This supply can be used in conjunction with the UV-lockout shown in Figure 15 to
provide a simple high-quality optoisolated drive.
The circuit in Figure 17a can be modified to provide higher
output current. By changing C1 to 680pF and R3 to 5.6k, its
performance changes to what is shown in Figures 20, 21 and
22. Other methods of developing isolated supplies are discussed
in Section 9.
7.2 Pulse transformers
A pulse transformer is, in principle, a simple, reliable and
highly noise-immune method of providing isolated gate drive.
Unfortunately it has many limitations that must be overcome
with additional components. A transformer can only transfer to
the secondary the AC component of the input signal.
Consequently, their output voltage swings from negative to
positive by an amount that changes with the duty cycle, as
shown in Figure 23. As a stand-alone component they can be
used for duty cycles between 35 and 65%.
Figure 14a.
Simple high current optoisolated driver
8
7
2
4
5
6
1
3
+C2
10
BATT1
15V
GATE
EMITTER
3.9V
C1
0.1
IRF7307 OR IRF7507
VCC
OUT
EN
VEE
C
A
8
7
6
5
ISO1
R1
2
3
3.3k
Input: 5V/div
Output : 5V/div
Horiz: 500ns/div
Figure 14b:
Waveforms associated with the
circuit of Figure 14a when loaded with 100nF
Figure 15a:
Optoisolated driver with UV lockout and negative gate bias
To Order
8
7
2
4
5
6
1
3
C2
10
BATT1
19V
GATE
EMITTER
3.9V
C1
0.1
IRF7309 OR IRF7509
VCC
OUT
EN
VEE
C
A
8
7
6
5
ISO1
R1
2
3
3.3k
R3
10k
Q3
R5
1K
R4
1K
D2
LED
R5
4.7K
D1
3.9V
C3
10
HCPL2200
2N2222
UNDERVOLTAGE
LOCK-OUT
OUTPUT
BUFFER
SINGLE TO SPLIT
POWER SUPPLY
IN+
IN-
Index
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