April 2008
FDD8878 / FDU8878
N-Channel PowerTrench® MOSFET
tm
30V, 40A, 15mΩ
Features
rDS(ON) = 15mΩ, VGS = 10V, ID = 35A
rDS(ON) = 18.5mΩ, VGS = 4.5V, ID = 35A
High performance trench technology for extremely low
General Description
This N-Channel MOSFET has been designed specifically to
improve the overall efficiency of DC/DC converters using
either synchronous or conventional switching PWM
controllers. It has been optimized for low gate charge, low
r DS(ON) and fast switching speed.
r DS(ON)
Low gate charge
High power and current handling capability
RoHS Compliant
Application
DC / DC Converters
D
D
G
S
D-PAK
(TO-252)
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
I-PAK
(TO-251AA)
G D S
G
S
www.fairchildsemi.com
1
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
0
Symbol
VDSS
Drain to Source Voltage
Parameter
Ratings
30
Units
V
VGS
Gate to Source Voltage
±20
V
40
A
Continuous (TC = 25 C, VGS = 4.5V) (Note 1)
36
A
Continuous (Tamb = 25oC, VGS = 10V, with RθJA = 52oC/W)
11
A
Drain Current
Continuous (TC = 25oC, VGS = 10V) (Note 1)
o
ID
Pulsed
E AS
Figure 4
A
25
mJ
Single Pulse Avalanche Energy (Note 2)
Power dissipation
PD
Derate above 25oC
TJ, TSTG
Operating and Storage Temperature
40
W
0.27
W/oC
o
-55 to 175
C
Thermal Characteristics
RθJC
Thermal Resistance Junction to Case TO-252, TO-251
3.75
oC/W
RθJA
Thermal Resistance Junction to Ambient TO-252, TO-251
100
o
C/W
52
o
C/W
2
RθJA
Thermal Resistance Junction to Ambient TO-252, 1in copper pad area
Package Marking and Ordering Information
Device Marking
FDD8878
Device
FDD8878
Package
TO-252AA
Reel Size
13”
Tape Width
12mm
Quantity
2500 units
FDU8878
FDU8878
TO-251AA
Tube
N/A
75 units
F
F
Electrical Characteristics TC = 25°C unless otherwise noted
Symbol
Parameter
Test Conditions
Min
Typ
Max
Units
30
-
-
-
V
-
1
-
-
250
µA
-
-
±100
nA
V
Off Characteristics
B VDSS
Drain to Source Breakdown Voltage
IDSS
Zero Gate Voltage Drain Current
IGSS
Gate to Source Leakage Current
ID = 250µA, VGS = 0V
V DS = 24V
VGS = 0V
TC = 150oC
VGS = ±20V
On Characteristics
VGS(TH)
rDS(ON)
Gate to Source Threshold Voltage
Drain to Source On Resistance
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
V GS = VDS, ID = 250µA
1.2
-
2.5
ID = 35A, VGS = 10V
-
0.011
0.015
ID = 35A, VGS = 4.5V
-
0.014
0.0185
ID = 35A, VGS = 10V,
TJ = 175oC
-
0.018
0.024
2
Ω
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
Absolute Maximum Ratings TC = 25°C unless otherwise noted
CISS
Input Capacitance
COSS
Output Capacitance
CRSS
Reverse Transfer Capacitance
RG
Gate Resistance
Qg(TOT)
Total Gate Charge at 10V
-
880
-
-
195
-
pF
-
110
-
pF
VGS = 0.5V, f = 1MHz
-
3.1
-
Ω
VGS = 0V to 10V
-
19
26
nC
V DS = 15V, VGS = 0V,
f = 1MHz
Qg(5)
Total Gate Charge at 5V
VGS = 0V to 5V
Qg(TH)
Threshold Gate Charge
VGS = 0V to 1V
Qgs
Gate to Source Gate Charge
Qgs2
Gate Charge Threshold to Plateau
Qgd
Gate to Drain “Miller” Charge
Switching Characteristics
VDD = 15V
ID = 35A
Ig = 1.0mA
pF
-
10
14
nC
-
0.9
1.3
nC
-
2.6
-
nC
-
1.7
-
nC
-
4.5
-
nC
(VGS = 10V)
tON
Turn-On Time
-
-
129
ns
td(ON)
Turn-On Delay Time
-
7
-
ns
tr
Rise Time
td(OFF)
Turn-Off Delay Time
tf
tOFF
-
79
-
ns
-
38
-
ns
Fall Time
-
27
-
ns
Turn-Off Time
-
-
97
ns
V
V DD = 15V, ID = 35A
V GS = 4.5V, RGS = 16Ω
Drain-Source Diode Characteristics
ISD = 35A
-
-
1.25
ISD = 3.2A
-
-
1.0
V
Reverse Recovery Time
ISD = 35A, dISD/dt = 100A/µs
-
-
23
ns
Reverse Recovered Charge
ISD = 35A, dISD/dt = 100A/µs
-
-
9
nC
V SD
Source to Drain Diode Voltage
trr
QRR
Notes:
1: Package current limitation is 35A.
2: Starting T J = 25°C, L = 65uH, IAS = 28A, VDD = 27V, VGS = 10V.
3
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
3
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
Dynamic Characteristics
50
CURRENT LIMITED
BY PACKAGE
1.0
40
ID, DRAIN CURRENT (A)
POWER DISSIPATION MULTIPLIER
1.2
0.8
0.6
0.4
VGS = 10V
30
VGS = 4.5V
20
10
0.2
0
0
25
50
75
100
150
125
0
175
25
50
75
TC , CASE TEMPERATURE (o C)
100
125
150
175
TC, CASE TEMPERATURE (oC)
Figure 1. Normalized Power Dissipation vs Case
Temperature
Figure 2. Maximum Continuous Drain Current vs
Case Temperature
2
ZθJC, NORMALIZED
THERMAL IMPEDANCE
1
DUTY CYCLE - DESCENDING ORDER
0.5
0.2
0.1
0.05
0.02
0.01
PDM
0.1
t1
t2
NOTES:
DUTY FACTOR: D = t1/t2
PEAK TJ = PDM x ZθJC x RθJC + TC
SINGLE PULSE
0.01
10-5
10-4
10-3
10-2
10-1
100
101
t, RECTANGULAR PULSE DURATION (s)
Figure 3. Normalized Maximum Transient Thermal Impedance
500
TC = 25o C
IDM, PEAK CURRENT (A)
TRANSCONDUCTANCE
MAY LIMIT CURRENT
IN THIS REGION
FOR TEMPERATURES
ABOVE 25o C DERATE PEAK
CURRENT AS FOLLOWS:
175 - TC
I = I25
150
VGS = 4.5V
100
VGS = 10V
30
10-5
10-4
10-3
10-2
10-1
100
101
t, PULSE WIDTH (s)
Figure 4. Peak Current Capability
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
4
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
Typical Characteristics TC = 25°C unless otherwise noted
1000
500
100
10µs
10
100µs
1
IAS, AVALANCHE CURRENT (A)
ID, DRAIN CURRENT (A)
OPERATION IN THIS
AREA MAY BE
LIMITED BY rDS(ON)
1ms
10ms
SINGLE PULSE
TJ = MAX RATED
TC = 25oC
If R = 0
tAV = (L)(I AS)/(1.3*RATED BVDSS - VDD)
If R ≠ 0
tAV = (L/R)ln[(I AS*R)/(1.3*RATED BVDSS - VDD) +1]
100
STARTING T J = 25o C
10
STARTING TJ = 150o C
DC
1
0.01
0.1
1
10
VDS, DRAIN TO SOURCE VOLTAGE (V)
60
0.1
1
tAV, TIME IN AVALANCHE (ms)
NOTE: Refer to Fairchild Application Notes AN7514 and AN7515
Figure 5. Forward Bias Safe Operating Area
Figure 6. Unclamped Inductive Switching
Capability
80
80
VGS = 5V
ID, DRAIN CURRENT (A)
ID , DRAIN CURRENT (A)
PULSE DURATION = 80µs
DUTY CYCLE = 0.5% MAX
VDD = 15V
60
TJ = 25o C
40
20
TJ = 175o C
60
VGS = 10V
VGS = 4V
40
VGS = 3V
20
TC = 25oC
PULSE DURATION = 80µs
DUTY CYCLE = 0.5% MAX
TJ = -55oC
0
0
1.5
2.0
2.5
3.0
3.5
VGS , GATE TO SOURCE VOLTAGE (V)
0
4.0
0.25
0.5
0.75
1.0
1.25
1.5
VDS , DRAIN TO SOURCE VOLTAGE (V)
Figure 7. Transfer Characteristics
Figure 8. Saturation Characteristics
1.8
30
NORMALIZED DRAIN TO SOURCE
ON RESISTANCE
PULSE DURATION = 80µs
DUTY CYCLE = 0.5% MAX
ID = 35A
rDS(ON), DRAIN TO SOURCE
ON RESISTANCE (mΩ)
10
25
20
15
ID = 1A
PULSE DURATION = 80µs
DUTY CYCLE = 0.5% MAX
1.6
1.4
1.2
1.0
0.8
VGS = 10V, ID = 35A
10
2
4
6
8
0.6
-80
10
VGS, GATE TO SOURCE VOLTAGE (V)
Figure 9. Drain to Source On Resistance vs Gate
Voltage and Drain Current
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
-40
0
40
80
120
160
TJ, JUNCTION TEMPERATURE (oC)
200
Figure 10. Normalized Drain to Source On
Resistance vs Junction Temperature
5
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
Typical Characteristics TC = 25°C unless otherwise noted
1.2
1.10
ID = 250µA
NORMALIZED DRAIN TO SOURCE
BREAKDOWN VOLTAGE
NORMALIZED GATE
THRESHOLD VOLTAGE
VGS = VDS, ID = 250µA
1.0
0.8
0.6
0.4
-80
-40
0
40
80
120
160
1.05
1.00
0.95
0.90
-80
200
-40
TJ, JUNCTION TEMPERATURE (oC)
Figure 11. Normalized Gate Threshold Voltage vs
Junction Temperature
80
120
160
200
10
VDD = 15V
VGS , GATE TO SOURCE VOLTAGE (V)
CISS = CGS + CGD
1000
C, CAPACITANCE (pF)
40
Figure 12. Normalized Drain to Source
Breakdown Voltage vs Junction Temperature
2000
COSS ≅ CDS + C GD
CRSS = CGD
100
VGS = 0V, f = 1MHz
50
0.1
0
TJ , JUNCTION TEMPERATURE (oC)
8
6
4
WAVEFORMS IN
DESCENDING ORDER:
ID = 35A
ID = 1A
2
0
1
10
VDS, DRAIN TO SOURCE VOLTAGE (V)
0
30
Figure 13. Capacitance vs Drain to Source
Voltage
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
5
10
Qg, GATE CHARGE (nC)
15
20
Figure 14. Gate Charge Waveforms for Constant
Gate Current
6
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
Typical Characteristics TC = 25°C unless otherwise noted
VDS
BVDSS
tP
L
VDS
VARY tP TO OBTAIN
REQUIRED PEAK IAS
IAS
+
RG
VDD
VDD
-
VGS
DUT
tP
IAS
0V
0
0.01Ω
tAV
Figure 15. Unclamped Energy Test Circuit
Figure 16. Unclamped Energy Waveforms
VDS
VDD
Qg(TOT)
VDS
L
VGS
VGS = 10V
VGS
Qg(5)
+
Qgs2
VDD
VGS = 5V
DUT
VGS = 1V
Ig(REF)
0
Qg(TH)
Qgs
Qgd
Ig(REF)
0
Figure 17. Gate Charge Test Circuit
Figure 18. Gate Charge Waveforms
VDS
tON
tOFF
td(ON)
td(OFF)
RL
tr
VDS
tf
90%
90%
+
VGS
VDD
-
10%
0
10%
DUT
90%
RGS
VGS
50%
50%
PULSE WIDTH
VGS
0
Figure 19. Switching Time Test Circuit
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
10%
Figure 20. Switching Time Waveforms
7
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FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
Test Circuits and Waveforms
The maximum rated junction temperature, TJM , and the
thermal resistance of the heat dissipating path determines
the maximum allowable device power dissipation, PDM , in an
application.
Therefore the application’s ambient
temperature, TA (oC), and thermal resistance RθJA (oC/W)
must be reviewed to ensure that TJM is never exceeded.
Equation 1 mathematically represents the relationship and
serves as the basis for establishing the rating of the part.
RθJA = 33.32+ 23.84/(0.268+Area) EQ.2
RθJA = 33.32+ 154/(1.73+Area) EQ.3
100
RθJA (oC/W)
(T
–T )
JM
A
P D M = ----------------------------R θ JA
125
(EQ. 1)
75
50
In using surface mount devices such as the TO-252
package, the environment in which it is applied will have a
significant influence on the part’s current and maximum
power dissipation ratings. Precise determination of PDM is
complex and influenced by many factors:
25
0.01
(0.0645)
0.1
(0.645)
1
10
(6.45)
(64.5)
AREA, TOP COPPER AREA in2 (cm2)
Figure 21. Thermal Resistance vs Mounting
Pad Area
1. Mounting pad area onto which the device is attached and
whether there is copper on one side or both sides of the
board.
2. The number of copper layers and the thickness of the
board.
3. The use of external heat sinks.
4. The use of thermal vias.
5. Air flow and board orientation.
6. For non steady state applications, the pulse width, the
duty cycle and the transient thermal response of the part,
the board and the environment they are in.
Fairchild provides thermal information to assist the
designer’s preliminary application evaluation. Figure 21
defines the RθJA for the device as a function of the top
copper (component side) area. This is for a horizontally
positioned FR-4 board with 1oz copper after 1000 seconds
of steady state power with no air flow. This graph provides
the necessary information for calculation of the steady state
junction temperature or power dissipation. Pulse
applications can be evaluated using the Fairchild device
Spice thermal model or manually utilizing the normalized
maximum transient thermal impedance curve.
Thermal resistances corresponding to other copper areas
can be obtained from Figure 21 or by calculation using
Equation 2 or 3. Equation 2 is used for copper area defined
in inches square and equation 3 is for area in centimeters
square. The area, in square inches or square centimeters is
the top copper area including the gate and source pads.
R
θ JA
23.84
( 0.268 + Area )
= 33.32 + -------------------------------------
(EQ. 2)
Area in Inches Squared
R
θ JA
154
( 1.73 + Area )
= 33.32 + ----------------------------------
(EQ. 3)
Area in Centimeters Squared
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
8
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
Thermal Resistance vs. Mounting Pad Area
.SUBCKT FDD8878 2 1 3 ; rev February 2004
Ca 12 8 8.6e-10
Cb 15 14 7.2e-10
Cin 6 8 8e-10
LDRAIN
DPLCAP
10
Dbody 7 5 DbodyMOD
Dbreak 5 11 DbreakMOD
Dplcap 10 5 DplcapMOD
RLDRAIN
RSLC1
51
5
51
EVTHRES
+ 19 8
+
LGATE
GATE
1
ESLC
11
+
17
EBREAK 18
-
50
RDRAIN
6
8
ESG
DBREAK
+
RSLC2
Ebreak 11 7 17 18 32.97
Eds 14 8 5 8 1
Egs 13 8 6 8 1
Esg 6 10 6 8 1
Evthres 6 21 19 8 1
Evtemp 20 6 18 22 1
It 8 17 1
DRAIN
2
5
EVTEMP
RGATE + 18 22
9
20
21
16
DBODY
MWEAK
6
MMED
MSTRO
RLGATE
Lgate 1 9 5.4e-9
Ldrain 2 5 1.0e-9
Lsource 3 7 2e-9
LSOURCE
CIN
8
7
SOURCE
3
RSOURCE
RLSOURCE
RLgate 1 9 54
RLdrain 2 5 10
RLsource 3 7 20
Mmed 16 6 8 8 MmedMOD
Mstro 16 6 8 8 MstroMOD
Mweak 16 21 8 8 MweakMOD
S1A
12
S2A
13
8
14
13
S1B
CA
RBREAK
15
17
18
RVTEMP
S2B
13
CB
6
8
EGS
Rbreak 17 18 RbreakMOD 1
Rdrain 50 16 RdrainMOD 6.9e-3
Rgate 9 20 3.1
RSLC1 5 51 RSLCMOD 1e-6
RSLC2 5 50 1e3
Rsource 8 7 RsourceMOD 2.7e-3
Rvthres 22 8 RvthresMOD 1
Rvtemp 18 19 RvtempMOD 1
S1a 6 12 13 8 S1AMOD
S1b 13 12 13 8 S1BMOD
S2a 6 15 14 13 S2AMOD
S2b 13 15 14 13 S2BMOD
5
8
EDS
-
19
VBAT
+
IT
14
+
+
-
8
22
RVTHRES
Vbat 22 19 DC 1
ESLC 51 50 VALUE={(V(5,51)/ABS(V(5,51)))*(PWR(V(5,51)/(1e-6*125),5))}
.MODEL DbodyMOD D (IS=2.6E-12 IKF=8 N=1.01 RS=6.4e-3 TRS1=8e-4 TRS2=2e-7
+ CJO=3.4e-10 M=0.53 TT=1e-17 XTI=2)
.MODEL DbreakMOD D (RS=1.4 TRS1=1e-3 TRS2=-5e-6)
.MODEL DplcapMOD D (CJO=3.4e-10 IS=1e-30 N=10 M=0.39)
.MODEL MmedMOD NMOS (VTO=1.75 KP=7 IS=1e-30 N=10 TOX=1 L=1u W=1u RG=3.1 T_ABS=25)
.MODEL MstroMOD NMOS (VTO=2.2 KP=100 IS=1e-30 N=10 TOX=1 L=1u W=1u T_ABS=25)
.MODEL MweakMOD NMOS (VTO=1.45 KP=0.03 IS=1e-30 N=10 TOX=1 L=1u W=1u RG=31 RS=0.1 T_ABS=25)
.MODEL RbreakMOD RES (TC1=8.3e-4 TC2=-8e-7)
.MODEL RdrainMOD RES (TC1=1e-4 TC2=7.5e-6)
.MODEL RSLCMOD RES (TC1=9e-4 TC2=1e-6)
.MODEL RsourceMOD RES (TC1=1.3e-2 TC2=2e-6)
.MODEL RvthresMOD RES (TC1=-1.7e-3 TC2=-8e-6)
.MODEL RvtempMOD RES (TC1=-2.2e-3 TC2=2e-7)
.MODEL S1AMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-4.5 VOFF=-3.5)
.MODEL S1BMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-3.5 VOFF=-4.5)
.MODEL S2AMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-2 VOFF=-1)
.MODEL S2BMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-1 VOFF=-2)
.ENDS
Note: For further discussion of the PSPICE model, consult A New PSPICE Sub-Circuit for the Power MOSFET Featuring Global
Temperature Options; IEEE Power Electronics Specialist Conference Records, 1991, written by William J. Hepp and C. Frank
Wheatley.
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
9
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
PSPICE Electrical Model
rev February 2004
template FDD8878 n2,n1,n3 =m_temp
electrical n2,n1,n3
number m_temp=25
{
var i iscl
dp..model dbodymod = (isl=2.6e-12,ikf=8,nl=1.01,rs=6.4e-3,trs1=8e-4,trs2=2e-7,cjo=3.4e-10,m=0.53,tt=1e-17,xti=2)
dp..model dbreakmod = (rs=1.4,trs1=1e-3,trs2=-5e-6)
dp..model dplcapmod = (cjo=3.4e-10,isl=10e-30,nl=10,m=0.39)
m..model mmedmod = (type=_n,vto=1.75,kp=7,is=1e-30, tox=1)
m..model mstrongmod = (type=_n,vto=2.2,kp=100,is=1e-30, tox=1)
m..model mweakmod = (type=_n,vto=1.45,kp=0.03,is=1e-30, tox=1,rs=0.1)
LDRAIN
sw_vcsp..model s1amod = (ron=1e-5,roff=0.1,von=-4.5,voff=-3.5)
DPLCAP 5
DRAIN
2
sw_vcsp..model s1bmod = (ron=1e-5,roff=0.1,von=-3.5,voff=-4.5)
10
sw_vcsp..model s2amod = (ron=1e-5,roff=0.1,von=-2,voff=-1)
RLDRAIN
RSLC1
sw_vcsp..model s2bmod = (ron=1e-5,roff=0.1,von=-1,voff=-2)
51
c.ca n12 n8 = 8.6e-10
RSLC2
c.cb n15 n14 = 7.2e-10
ISCL
c.cin n6 n8 = 8e-10
spe.ebreak n11 n7 n17 n18 = 32.97 GATE
spe.eds n14 n8 n5 n8 = 1
1
spe.egs n13 n8 n6 n8 = 1
spe.esg n6 n10 n6 n8 = 1
spe.evthres n6 n21 n19 n8 = 1
spe.evtemp n20 n6 n18 n22 = 1
RDRAIN
6
8
ESG
EVTHRES
+ 19 8
+
LGATE
DBREAK
50
-
dp.dbody n7 n5 = model=dbodymod
dp.dbreak n5 n11 = model=dbreakmod
dp.dplcap n10 n5 = model=dplcapmod
EVTEMP
RGATE + 18 22
9
20
21
11
DBODY
16
MWEAK
6
EBREAK
+
17
18
-
MMED
MSTRO
RLGATE
CIN
8
LSOURCE
SOURCE
3
7
RSOURCE
RLSOURCE
i.it n8 n17 = 1
S1A
12
l.lgate n1 n9 = 5.4e-9
l.ldrain n2 n5 = 1.0e-9
l.lsource n3 n7 = 2e-9
S2A
13
8
res.rlgate n1 n9 = 54
res.rldrain n2 n5 = 10
res.rlsource n3 n7 = 20
15
14
13
S1B
17
18
RVTEMP
S2B
13
CA
RBREAK
CB
6
8
EGS
19
-
IT
14
+
+
VBAT
5
8
EDS
-
m.mmed n16 n6 n8 n8 = model=mmedmod, l=1u, w=1u, temp=m_temp
m.mstrong n16 n6 n8 n8 = model=mstrongmod, l=1u, w=1u, temp=m_temp
m.mweak n16 n21 n8 n8 = model=mweakmod, l=1u, w=1u, temp=m_temp
+
8
22
RVTHRES
res.rbreak n17 n18 = 1, tc1=8.3e-4,tc2=-8e-7
res.rdrain n50 n16 = 6.9e-3, tc1=1e-4,tc2=7.5e-6
res.rgate n9 n20 = 3.1
res.rslc1 n5 n51 = 1e-6, tc1=9e-4,tc2=1e-6
res.rslc2 n5 n50 = 1e3
res.rsource n8 n7 = 2.7e-3, tc1=1.3e-2,tc2=2e-6
res.rvthres n22 n8 = 1, tc1=-1.7e-3,tc2=-8e-6
res.rvtemp n18 n19 = 1, tc1=-2.2e-3,tc2=2e-7
sw_vcsp.s1a n6 n12 n13 n8 = model=s1amod
sw_vcsp.s1b n13 n12 n13 n8 = model=s1bmod
sw_vcsp.s2a n6 n15 n14 n13 = model=s2amod
sw_vcsp.s2b n13 n15 n14 n13 = model=s2bmod
v.vbat n22 n19 = dc=1
equations {
i (n51->n50) +=iscl
iscl: v(n51,n50) = ((v(n5,n51)/(1e-9+abs(v(n5,n51))))*((abs(v(n5,n51)*1e6/125))** 5))
}
}
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
10
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
SABER Electrical Model
th
JUNCTION
REV 23 February 2004
FDD8878T
CTHERM1 TH 6 3.5e-4
CTHERM2 6 5 5e-4
CTHERM3 5 4 2.5e-3
CTHERM4 4 3 2.7e-3
CTHERM5 3 2 5e-3
CTHERM6 2 TL 1e-2
RTHERM1
CTHERM1
6
RTHERM1 TH 6 2.9e-1
RTHERM2 6 5 3.5e-1
RTHERM3 5 4 4.5e-1
RTHERM4 4 3 5.2e-1
RTHERM5 3 2 6.9e-1
RTHERM6 2 TL 7e-1
RTHERM2
CTHERM2
5
SABER Thermal Model
SABER thermal model FDD8878T
template thermal_model th tl
thermal_c th, tl
{
ctherm.ctherm1 th 6 =3.5e-4
ctherm.ctherm2 6 5 =5e-4
ctherm.ctherm3 5 4 =2.5e-3
ctherm.ctherm4 4 3 =2.7e-3
ctherm.ctherm5 3 2 =5e-3
ctherm.ctherm6 2 tl =1e-2
RTHERM3
CTHERM3
4
RTHERM4
rtherm.rtherm1 th 6 =2.9e-1
rtherm.rtherm2 6 5 =3.5e-1
rtherm.rtherm3 5 4 =4.5e-1
rtherm.rtherm4 4 3 =5.2e-1
rtherm.rtherm5 3 2 =6.9e-1
rtherm.rtherm6 2 tl =7e-1
}
CTHERM4
3
RTHERM5
CTHERM5
2
RTHERM6
CTHERM6
tl
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
11
CASE
www.fairchildsemi.com
FDD8878 / FDU8878 N-Channel PowerTrench® MOSFET
PSPICE Thermal Model
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Advance Information
Formative or In Design
This datasheet contains the design specifications for product development.
Specifications may change in any manner without notice.
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Rev. I34
©2008 Fairchild Semiconductor Corporation
FDD8878 / FDU8878 Rev. A4
www.fairchildsemi.com