LD7575 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

LD7575

Green-Mode PWM Controller

Unspecified 

i = Cgd ⋅ dVbulk

dt

Fig. 20

LD7575

Protection Resistor on the Hi-V Path

In some other Hi-V process and design, there may cause a

parasitic SCR between HV pin, Vcc and GND. As shown

in figure 22, a small negative spike on the HV pin may

trigger this parasitic SCR and causes the latchup between

Vcc and GND. And such latchup is easy to damage the

chip because of the equivalent short-circuit which is induced

by such latchup behavior.

Thanks to the Leadtrend’s proprietary Hi-V technology,

there is no such parasitic SCR in LD7575. Figure 23

shows the equivalent circuit of LD7575’s Hi-V structure.

So that LD7575 is with higher capability to sustain negative

voltage than similar products. However, a 10KΩ resistor is

recommended to implement on the Hi-V path to be played

the role as a current limit resistor whenever a negative

voltage is applied in any case.

Fig. 21

Leadtrend Technology Corporation

LD7575-DS-04b November 2007

12

www.leadtrend.com.tw

Fig. 22

Share Link: