LD7576GS Просмотр технического описания (PDF) - Unspecified

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LD7576GS

Green-Mode PWM Controller

Unspecified 

LD7576/76H/76J/76K

Fig. 20

Pull-Low Resistor on the Gate Pin of MOSFET

The LD7576X series consist with an anti-floating resistor on

the OUT pin to protect the output from abnormally operation

or false triggering of MOSFET. Even so, we still recommend

adding an external one on the MOSFET gate terminal to

provide more protection in case of disconnection of gate

resistor RG during power-on.

In such single-fault condition, as show in figure 22, the

resistor R8 can provide a discharge path to avoid the

MOSFET from being false-triggered by the current through

the gate-to-drain capacitor CGD. Therefore, the MOSFET

is always pulled low and placed in the off-state whenever

the gate resistor is disconnected or opened in any case.

Fig. 21

i = Cgd ⋅ dVbulk

dt

Fig. 22

Leadtrend Technology Corporation

LD7576-DS-03 December 2007

14

www.leadtrend.com.tw

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