LD7830GS datasheet(13/18 Pages) LEADTREND

13 / 18 page

LD7830

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7830-DS-01a

August 2012

VCC

UVLO(on)

UVLO(off)

COMP

OLP

OUT

OLP Delay Time

Switching

Non-Switching

OLP trip Level

4nd UVLO(off)

OLP Counter Reset

Fig. 19

OVP (Over Voltage Protection) on Vcc

The maximum rating of the VCC pin is limited below 29V.

To prevent VCC from the fault condition, the LD7830 is

implemented with OVP function on Vcc pin. As soon as

the Vcc voltage is over OVP threshold voltage, the output

gate drive circuit will be shutdown simultaneously thus to

stop the switching of the power MOSFET until the next

UVLO(on). The Vcc OVP function of the LD7830 is an

auto-recovery protection. The Fig. 20 shows its operation.

Upon removal of the OVP condition will resume the Vcc

level and the output operation

VCC

UVLO(on)

UVLO(off)

OVP Tripped

OUT

Switching

Non-Switching

OVP Level

Fig. 20

Fault Protection

There are several critical protections were integrated in

the LD7830 to prevent the power supply or adapter from

being damaged. Those damages usually come from open

or short condition caused to LD7830.

Once it happens in below condition, the gate output will

turn off immediately to protect the power circuit ---

Comp pin floating

CS pin floating

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