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LD7538 bảng dữ liệu(PDF) 13 Page - Leadtrend Technology

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LD7538 bảng dữ liệu(HTML) 13 Page - Leadtrend Technology

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LD7538
13
Leadtrend Technology Corporation
LD7538-DS-00
November 2012
saturation; it would cause damage for acting beyond the
maximum safety operating area. It
’s necessary to check
the characteristic of MOSFET.
Fig. 23 shows a totem pole architecture for the circuit of
OUT. The output high level of OUT is at around VCC-1.5V.
Refer to on-region characteristics of the MOSFET, check
the saturation current of VGSH(MIN) to make sure the
saturation current is high enough to activate MOSFET to
operate in ohmic region. In order not to decrease the
voltage across VG, it’s recommended not to connect a
forward diode between the gate of the MOSFET and OUT
pin, for example like Fig 24.
In addition, pulling VCC level high can keep VGSH in high
level, for example:
1.
Increase NX value to pull VCC level high.
2.
Increase
VCC capacitance to improve VCC’s
performance to drop at startup transient, shown as Fig 25.
VDS
ID
Ohmic Region
Saturation Region
VGS1
VGS2
VGS3
VGS4
VGS5
VGS5 > VGS4 > VGS3 > VGS2 > VGS1
Cut-off region
Fig. 22
CS
GND
OUT
VGS
VS
VCC
VG
VD
VDS
RS
NX
CVCC
Fig. 23
CS
GND
OUT
VCC
VG
RS
NX
CVCC
Fig. 24
VCC
t
Large Capacitance of VCC Cap
Small Capacitance of VCC Cap
UVLO(on)
Fig. 25



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