Model the Gate Charge, Transient, and Diode Reverse Recovery
Characteristics
DESCRIPTION
The attached spice model describes the typical electrical
characteristics of the p-channel vertical DMOS. The subcircuit
model is extracted and optimized over the
−55
to 125°C
temperature ranges under the pulsed 0-V to 10-V gate drive. The
saturated output impedance is best fit at the gate bias near the
threshold voltage.
A novel gate-to-drain feedback capacitance network is used to model
the gate charge characteristics while avoiding convergence difficulties
of the switched C
gd
model. All model parameter values are optimized
to provide a best fit to the measured electrical data and are not
intended as an exact physical interpretation of the device.
SUBCIRCUIT MODEL SCHEMATIC
This document is intended as a SPICE modeling guideline and does not constitute a commercial product data sheet. Designers should refer to the appropriate
data sheet of the same number for guaranteed specification limits.
Document Number: 73080
S-52521Rev. B, 12-Dec-05
www.vishay.com
1
SPICE Device Model Si7439DP
Vishay Siliconix
SPECIFICATIONS (T
J
= 25°C UNLESS OTHERWISE NOTED)
Parameter
Static
Gate Threshold Voltage
On-State Drain Current
a
Drain-Source On-State Resistance
a
Forward Transconductance
a
Diode Forward Voltage
a
Symbol
Test Condition
Simulated
Data
2.9
66
0.075
0.080
17
−0.84
Measured
Data
Unit
V
GS(th)
I
D(on)
r
DS(on)
g
fs
V
SD
V
DS
= V
GS
, I
D
=
−250 µA
V
DS
=
−10
V, V
GS
=
−1
0V
V
GS
=
−10
V, I
D
=
−5.2
A
V
GS
=
−6
V, I
D
=
−5
A
V
DS
=
−15
V, I
D
=
−5.2
A
I
S
=
−4.2
A, V
GS
= 0 V
V
A
0.073
0.077
19
−0.78
Ω
S
V
Dynamic
b
Total Gate Charge
Gate-Source Charge
Gate-Drain Charge
Q
g
Q
gs
Q
gd
V
DS
=
−75
V, V
GS
=
−10
V, I
D
=
−5.2
A
89
17.5
26.5
88
17.5
26.5
nC
Notes
a. Pulse test; pulse width
≤
300
µs,
duty cycle
≤
2%.
b. Guaranteed by design, not subject to production testing.
www.vishay.com
2
Document Number: 73080
S-52521Rev. B, 12-Dec-05
SPICE Device Model Si7439DP
Vishay Siliconix
COMPARISON OF MODEL WITH MEASURED DATA (T
J
=25°C UNLESS OTHERWISE NOTED)
Document Number: 73080
S-52521Rev. B, 12-Dec-05
www.vishay.com
3
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Vishay
Disclaimer
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therein, which apply to these products.
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模拟与混合信号
