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LD7752GS Datasheet(PDF) 11 Page - Leadtrend Technology

Part # LD7752GS
Description  Green-Mode PWM Controller with HV Start-Up Circuit and Soft Start time Adjustment
PDF  17 Pages
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Manufacturer  LEADTREND [Leadtrend Technology]
Direct Link  https://www.leadtrend.com.tw/
Logo LEADTREND - Leadtrend Technology

LD7752GS Datasheet(HTML) 11 Page - Leadtrend Technology

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LD7752
11
Leadtrend Technology Corporation
www.leadtrend.com.tw
LD7752-DS-01 June 2013
OVP (Over Voltage Protection) on Vcc -
Auto Recovery
The maximum VGS ratings of the power MOSFETs are
mostly set at 30V. To prevent the VGS from damage in
fault condition, LD7752 is embedded with OVP function
on Vcc.
Once the Vcc voltage rises above OVP
threshold, it shuts down output gate drive circuit
simultaneously and disable the switching of the power
MOSFET until the next UVLO(on) is reached.
The
LD7752
possess
auto-recoverable
Vcc OVP
functions. The OVP condition usually comes with
open-loop of feedback. Before it
’s released, the Vcc will
trip to OVP level and shutdown the output again. The
Vcc works in hiccup mode. Fig. 12 shows its operation.
Otherwise, soon as the OVP condition is removed, the
Vcc
level
will be resumed
and the
output will
automatically return to the normal operation.
VCC
UVLO(on)
UVLO(off)
t
OVP Tripped
t
OUT
Switching
Switching
Non-Switching
OVP Level
Fig. 12
Pull-Low Resistor on the Gate Pin of
MOSFET
The LD7752 consists of 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 at the MOSFET
gate terminal to provide more protection in case of
disconnection of gate resistor RG during power-on.
In single-fault condition, as shown in Fig. 13, 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 no matter
when the gate resistor is disconnected or opened.
CS
GND
LD7752
It is recommended to add an
resistor on the power circuit.
OUT
Rg
R8
An internal pull-low resistor is built in here to
prevent from floating.
Fig. 13
CS
GND
LD7752
This resistor is to prevent the MOSFET
from false triggering by the current
through Cgd in case Rg is disconnected.
OUT
Rg
R8
Cgd
dt
dV
Cgd
i
bulk
Vbulk
Fig. 14



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