ld7577ja Leadtrend Technology, ld7577ja Datasheet - Page 15

• Manufacturer Part Number: ld7577ja
• Description: High Voltage Green-mode Pwm Controller With Brown-out Protection
• Manufacturer: Leadtrend Technology

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, V
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 V
damage the chip easily because of the equivalent
short-circuit induced.
The LD7577JA has eliminated the parasitic SCR
efficiently. Figure 25 shows the equivalent circuit of the
LD7577JA’s Hi-V structure. It illustrates the LD7577JA is
capable to sustain negative voltage and superior than
similar products. Even though, a 40KΩ resistor is still
recommended to be placed on the Hi-V path.
Leadtrend Technology Corporation
LD7577JA-DS-00b November 2009
CC
and GND.
Fig. 24
Fig. 25
Such latchup will
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CC
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LD7577JA