LD7750AGN 查看數據表（PDF） - Unspecified

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LD7750AGN

High Voltage Green-Mode PWM Controller with Over Temperature Protection

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i = Cgd ⋅ dVbulk

dt

LD7750A

LD7750A features superior capability to sustain negative

voltage than those similar products. Nevertheless, a 39KΩ

resistor is recommended to implement on the Hi-V path to

act as a current limit resistor no matter what negative

voltage is present in any situation.

Fig. 21

Protection Resistor on the Hi-V Path

In some other Hi-V processes and designs, there may be

a parasitic SCR caused around the pins of HV, Vcc and

GND. As shown in Fig. 22, a small negative spike over

the HV pin may trigger this parasitic SCR and cause latch

up between Vcc and GND. And such latch up will easily

damage the chip because of the equivalent short-circuits

induced.

With the Leadtrend’s proprietary Hi-V technology, there is

no such parasitic SCR in LD7750A. Fig. 23 shows the

equivalent circuit of LD7750A’s Hi-V structure. The

Fig. 22

Fig. 23

Leadtrend Technology Corporation

LD7750A-DS-00 June 2010

14

www.leadtrend.com.tw

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