LD7575 datasheet(12/18 Pages) ETC2

Part #	LD7575

Description	Green-Mode PWM Controller with High-Voltage Start-Up Circuit

PDF	18 Pages

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Manufacturer	ETC2 [List of Unclassifed Manufacturers]

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12 / 18 page

LD7575

Leadtrend Technology Corporation

LD7575-DS-04a June 2007

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Fig. 20

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 10K

Ω 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

Fig. 22

LD7575 Datasheet(PDF) 12 Page - List of Unclassifed Manufacturers