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LD7577 bảng dữ liệu(PDF) 14 Page - Leadtrend Technology

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LD7577 bảng dữ liệu(HTML) 14 Page - Leadtrend Technology

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LD7577
14
Leadtrend Technology Corporation
www.leadtrend.com.tw
LD7577-DS-01 January 2009
Fig. 22
dt
dV
Cgd
i
bulk
⋅
=
Fig. 23
Protection Resistor on the Hi-V Path
In some other Hi-V processes and designs, there is
probably some parasitic SCR caused around HV pin, VCC
and GND.
As shown in figure 24, a small negative spike in
the HV pin may trigger this parasitic SCR and cause the
latchup between VCC and GND. Such latchup will damage
the chip easily because of the equivalent short-circuit
induced.
The LD7577 has eliminated the parasitic SCR efficiently.
Figure 25 shows the equivalent circuit of the LD7577’s Hi-V
structure.
It tells the LD7577 is capable to sustain negative
voltage and superior than similar products. Even though, a
40K
Ω resistor is still recommended to be placed on the Hi-V
path
Fig. 24
Fig. 25



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