Datasheet FDD8876 Datasheet (Fairchild)

N

April 2008

FDD8876 / FDU8876

N-Channel PowerTrench® MOSFET 30V, 73A, 8.2mΩ

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

and fast switching speed.

DS(ON)

Applications

• DC/DC converters

D

G

S

D-PAK

TO-252

(TO-252)

MOSFET Maximum Ratings T

Symbol Parameter Ratings Units

V V

I

E P T

D

DSS GS

AS

D

, T

J

STG

Drain to Source Voltage 30 V Gate to Source Voltage ±20 V Drain Current Continuous (T Continuous (T Continuous (T Pulsed Figure 4 A Single Pulse Avalanche Energy (Note 2) 95 mJ Power dissipation 70 W Derate above 25 Operating and Storage Te mperature -55 to 175

= 25oC, VGS = 10V) (Note 1)

C

= 25oC, VGS = 4.5V) (Note 1) 66 A

C

= 25oC, VGS = 10V, with R

amb

o

C0.47W/

G DS

= 25°C unless otherwise noted

C

Features

•r

• High performance trench technology for extremely low

• Low gate charge

• High power and current handling capability

• RoHS Compliant

= 52oC/W) 15 A

θJA

= 8.2mΩ, V

DS(ON)

= 10mΩ, V

DS(ON)

r

DS(ON)

I-PAK

(TO-251AA)

= 10V, ID = 35A

GS

= 4.5V, ID = 35A

GS

D

G

S

73 A

tm

o

C

o

C

Thermal Characteristics

R

θJC

R

θJA

R

θJA

Thermal Resistance Junction to Case TO-252, TO-251 2.14 Thermal Resistance Junction to Ambient TO-252, TO-251 100 Thermal Resistance Junction to Ambient TO-252, 1in2 copper pad area 52

o

C/W

o

C/W

o

C/W

FDD8876 / FDU8876 Rev. A3

Package Marking and Ordering Information

Device Marking Device Package Reel Size Tape Width Quantity

FDD8876 FDD8876 TO-252AA 13” 12mm 2500 units FDU8876 FDU8876 TO-251AA Tube N/A 75 units F F

FDD8876 / FDU8876

Electrical Characteristics

TC = 25°C unless otherwise noted

Symbol Parameter Tes t Cond itions Min Typ Max Units

Off Characteristics

B

VDSS

I

DSS

I

GSS

Drain to Source Breakdown Voltage ID = 250µA, VGS = 0V 30 - - V

V

= 24V - - 1

Zero Gate Voltage Drain Current

DS

= 0V TC = 150oC - - 250

V

GS

Gate to Source Leakage Current VGS = ±20V - - ±100 nA

On Characteristics

V

GS(TH)

r

DS(ON)

Gate to Source Threshold Voltage VGS = VDS, ID = 250µA 1.2 - 2.5 V

I

= 35A, VGS = 10V - 0.0066 0.0082

D

= 35A, VGS = 4.5V - 0.008 0.010

I

Drain to Source On Resistance

D

I

= 35A, VGS = 10V,

D

= 175oC

T

J

- 0.011 0.013

Dynamic Characteristics

C

ISS

C

OSS

C

RSS

R

G

Q

g(TOT)

Q

g(5)

Q

g(TH)

Q

gs

Q

gs2

Q

gd

Input Capacitance Output Capacitance - 330 - pF Reverse Transfer Capacitance - 200 - pF

= 15V, VGS = 0V,

V

DS

f = 1MHz

Gate Resistance VGS = 0.5V, f = 1MHz - 2.2 - Ω Total Gate Charge at 10V VGS = 0V to 10V Total Gate Charge at 5V VGS = 0V to 5V - 18 26 nC

V

= 15V

Threshold Gate Charge VGS = 0V to 1V - 1.4 1.9 nC Gate to Source Gate Charge - 4.2 - n C Gate Charge Threshold to Plateau - 2.8 - nC

DD

= 35A

I

D

= 1.0mA

I

g

Gate to Drain “Miller” Charge - 8.0 - nC

- 1700 - pF

-3447nC

µA

Ω

Switching Characteristics

t

ON

t

d(ON)

t

r

t

d(OFF)

t

f

t

OFF

Turn-On Time Turn-On Delay Time - 8 - ns Rise Time - 91 - ns Turn-Off Delay Time - 44 - ns Fall Time - 37 - n s Turn-Off Time - - 122 ns

(VGS = 10V)

= 15V, ID = 35A

V

DD

= 10V, RGS = 10Ω

V

GS

- - 149 ns

Drain-Source Diode Characteristics

I

= 35A - - 1.25 V

V

SD

t

rr

Q

RR

Notes: 1: Package current limitation is 35A. 2: Starting T 3

Source to Drain Diode Voltage Reverse Recovery Time ISD = 35A, dISD/dt = 100A/µs- -26ns

Reverse Recovered Charge ISD = 35A, dISD/dt = 100A/µs- -12nC

= 25°C, L = 0.24mH, IAS = 28A, VDD = 27V, VGS = 10V.

J

SD

I

= 15A - - 1.0 V

SD

FDD8876 / FDU8876

Typical Characteristics T

= 25°C unless otherwise noted

C

1.2

1.0

0.8

0.6

0.4

0.2

POWER DISSIPATION MULT IPL I ER

0

0 25 50 75 100 175

125

150

TC, CASE TEMPERATURE (oC)

Figure 1. Normali ze d Po we r Dis sip ation vs Case

Temperature

2

DUTY CYCLE - DESCENDING ORDER

0.5

1

0.2

0.1

0.05

0.02

0.01

0.1

, NORMALIZED

θJC

Z

THERMAL IMPEDANCE

0.01

-5

10

SINGLE PULSE

-4

10

-3

10

t, RECTANGULAR PULSE DURATION (s)

80

CURRENT LIMITED BY PACKAGE

60

VGS = 10V

40

, DRAIN CURRENT (A)

D

20

I

0

25 50 75 100 125 150

VGS = 4.5V

175

TC, CASE TEMPERATURE (oC)

Figure 2. Maximum Contin uous Drain Current vs

Case Temperature

P

DM

t

1

t

x R

θJC

+ T

2

C

1

10

NOTES: DUTY FACTOR: D = t

PEAK TJ = PDM x Z

-2

10

-1

10

θJC

10

1/t2

0

Figure 3. Normalized Maximum Transient Thermal Impedance

1000

TRANSCONDUCTANCE MAY LIMIT CURRENT IN THIS REGION

VGS = 4.5V

100

, PEAK CURRENT (A)

DM

I

30

-5

10

-4

10

-3

10

-2

10

-1

10

t, PUL SE WIDTH (s)

TC = 25oC FOR TEMPERATURES

o

ABOVE 25

C DERATE PEAK

CURRENT AS FOLLOWS:

175 - T

I = I

25

10

C

150

0

1

10

Figure 4. Peak Current Capability

FDD8876 / FDU8876

Typical Characteristics T

1000

100

10

OPERATION IN THIS

AREA MAY BE

, DRAIN CURRENT (A)

D

I

LIMITED BY r

1

SINGLE PULSE TJ = MAX RATED

= 25oC

T

C

0.1 110

DS(ON)

V

, DRAIN TO SOURCE VOLTAGE (V)

DS

= 25°C unless otherwise noted

C

Figure 5. Forward Bias Safe Operating Area

100

PULSE DURATION = 80µs DUTY CYCLE = 0.5% MAX

V

= 15V

DD

80

60

TJ = 25oC

40

, DRAIN CURRENT (A)

D

I

20

TJ = 175oC

0

1.5 2.0 2.5 3.0 3.5 4.0 VGS, GATE TO SOURCE VOLTAGE (V)

TJ = -55oC

10µs

100µs

1ms

10ms

DC

500

If R = 0 tAV = (L)(IAS)/(1.3*RATED BV

If R ≠ 0 t

= (L/R)ln[(IAS*R)/(1.3*RATED BV

AV

100

10

, AVALANCHE CURRENT (A)

AS

I

60

1

0.01 0.1 1

STARTING TJ = 150oC

tAV, TIME IN AVALANCHE (ms)

- VDD)

DSS

- VDD) +1]

DSS

STARTING TJ = 25oC

NOTE: Refer to Fairchild Applica ti on Note s AN75 14 and AN75 15

Figure 6. Unclamped Inductive Switching

Capability

100

VGS = 5V

80

VGS = 10V

60

40

, DRAIN CURRENT (A)

D

I

20

0

0 0.2 0.4 0.6 0.8 1.0

VDS, DRAIN TO SOURCE VOLTAGE (V)

VGS = 4V

VGS = 3V

PULSE DURATION = 80µs

DUTY CYCLE = 0.5% MAX

10

TC = 25oC

Figure 7. Transfer Characteristics Figure 8. Saturation Characteristics

20

ID = 35A

15

, DRAIN TO SOURCE

10

ON RESISTANCE (mΩ)

DS(ON)

ID = 1A

r

5

246810

, GATE TO SOURCE VOLTAGE (V)

V

GS

PULSE DURATION = 80µs DUTY CYCLE = 0.5% MAX

Figure 9. Drain to Source On Resis tanc e vs Ga te

Voltage and Drain Current

1.6

PULSE DURATION = 80µs DUTY CYCLE = 0.5% MAX

1.4

1.2

1.0

ON RESISTANCE

0.8

NORMALIZED DRAIN TO SOURCE

0.6

-80 -40 0 40 80 120 160 200 TJ, JUNCTION TEMPERATURE (oC)

VGS = 10V, ID = 35A

Figure 10. Normalized Drain to Source On

Resistance vs Junction Temperature

FDD8876 / FDU8876

Typical Characteristics T

1.2

1.0

0.8

NORMALIZED GATE

THRESHOLD VOLTAGE

0.6

0.4

-80 -40 0 40 80 120 160 200 TJ, JUNCTION TEMPERATURE (oC)

= 25°C unless otherwise noted

C

VGS = VDS, ID = 250µA

Figure 11. Normalized Gate Thresho ld Voltage vs

Junction Temperature

5000

C

= CGS + C

1000

C

= C

RSS

C, CAPA CITANCE (pF)

100

0.1 1 10

GD

V

= 0V, f = 1MHz

GS

VDS, DRAIN TO SOURCE VOLTAGE (V)

ISS

C

OSS

≅ C

GD

+ C

DS

GD

30

1.10 ID = 250µA

1.05

1.00

BREAKDOWN VOLTA GE

0.95

NORMALIZED DRAIN TO SOURCE

0.90

-80 -40 0 40 80 120 160 200 T

, JUNCTION TEMPERATURE (oC)

J

Figure 12. Normalized Drain to Source

Breakdown Voltage vs Junction Temperature

10

VDD = 15V

8

6

4

2

, GATE TO SOURCE VOLTAGE (V)

GS

V

0

0 5 10 15 20 25 30

Qg, GATE CHARGE (nC)

WAVEFORMS IN DESCENDING ORDER:

ID = 35A I

= 5A

D

Figure 13. Capacitance vs Drain to Source

Voltage

Figure 14. Gate Charge Waveforms for Constant

Gate Current

Test Circuits and Waveforms

V

DS

L

TO OBTAIN

VARY t

P

REQUIRED PEAK I

V

GS

R

AS

G

+

V

DD

-

I

AS

DUT

t

0V

P

I

AS

0.01Ω

0

Figure 15. Unclamped Energy Test Circuit Figure 16. Unclamped Energy Waveforms

V

DS

V

DD

V

Q

I

g(REF)

L

V

GS

DUT

+

V

DD

-

V

GS

0

I

g(REF)

= 1V

Q

gs2

Q

g(TH)

Q

gs

0

Figure 17. Gate Charge Test Circuit Figure 18. Gate Charge Waveforms

BV

DSS

t

P

t

AV

Q

g(TOT)

V

DS

Q

g(5)

GS

VGS = 5V

gd

FDD8876 / FDU8876

V

DS

V

DD

V

= 10V

GS

V

DS

R

L

V

GS

R

GS

V

GS

DUT

+

V

DD

-

V

DS

0

V

GS

10%

0

t

d(ON)

90%

t

ON

50%

10%

t

r

PULSE WIDTH

t

d(OFF)

90%

t

OFF

t

f

90%

10%

50%

Figure 19. Switching Time Test Circuit Figure 20. Switching Time Waveforms

Thermal Resistance vs. Mounting Pad Area

The maximum rated junction temperature, TJM, and the thermal resistance of the heat dissipating path determines the maximum allowable device power dissipation, P application. Therefore the application’s ambient temperature, T must be reviewed to ensure that T Equation 1 mathematically represents the relationship and

(oC), and thermal resistance R

A

is never exceeded.

JM

DM

θJA

, in an

(oC/W)

serves as the basis for establishing the rating of the part.

P

DM

TJMTA–()

------------------- ----------=

R

θJA

(EQ. 1)

125

100

C/W)

o

(

75

θJA

R

50

R

= 33.32+ 23.84/(0.268+Area) EQ.2

θJA

R

= 33.32+ 154/(1.73+Area) EQ.3

θJA

FDD8876 / FDU8876

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 P complex and influenced by many factors:

DM

is

1. Mounting pad area onto which the device is attached and whether there is copper on one side or both sides of t he 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 R copper (component side) area. This is for a horizontally

for the device as a function of the top

θJA

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.

25

0.01 0.1 1 10 (0.645) (6.45) (64.5)(0.0645)

AREA, TOP COPPER AREA in2 (cm2)

Figure 21. Thermal Resistance vs Mounting

Pad Area

Thermal resistances corresponding to other copper area s 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.

θJA

33.32

R

23.84

-------------------------------------+=

0.268 Area+()

Area in Inches Squared

154

----------------------------------+=

1.73 Area+()

Area in Centimeters Squared

(EQ. 2)

(EQ. 3)

PSPICE Electrical Model

.SUBCKT FDD8876 2 1 3 ; rev January 2004 Ca 12 8 1.9e-9 Cb 15 14 1.6e-9 Cin 6 8 1.55e-9

Dbody 7 5 DbodyMOD Dbreak 5 11 DbreakMOD Dplcap 10 5 DplcapMOD

Ebreak 11 7 17 18 33.15 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 Lgate 1 9 4.7e-9

Ldrain 2 5 1.0e-9 Lsource 3 7 1.7e - 9

RLgate 1 9 47 RLdrain 2 5 10 RLsource 3 7 17

Mmed 16 6 8 8 MmedMOD Mstro 16 6 8 8 MstroMOD Mweak 16 21 8 8 MweakMOD

Rbreak 17 18 RbreakMOD 1 Rdrain 50 16 RdrainMOD 2.9e-3 Rgate 9 20 2.2 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

GATE

1

LGATE

RLGATE

RGATE

9

CA

ESG

+

EVTEMP

+

-

18 22

20

S1A

12

13

8

S1B

EGS EDS

-

13

6 8

10

RSLC2

6

14 13

+

6 8

-

DPLCAP

EVTHRES

+

19

8

S2A

S2B

15

CIN

CB

-

+

-

5

51

5

51

MSTRO

14

5 8

RSLC1

+

ESLC

50

RDRAIN

16

21

8

MMED

8

DBREAK

11

+

17

EBREAK

IT

18

-

MWEAK

RSOURCE

RBREAK

17 18

RVTHRES

7

+

RVTEMP 19

-

22

LDRAIN

RLDRAIN

DBODY

LSOURCE

RLSOURCE

VBAT

DRAIN

2

SOURCE

3

FDD8876 / FDU8876

Vbat 22 19 DC 1 ESLC 51 50 VALUE={(V(5,51)/ABS(V(5,51)))*(PWR(V(5,51)/(1e-6*300),10))} .MODEL DbodyMOD D (IS=3E-12 IKF=10 N=1.01 RS=3.4e-3 TRS1=8e-4 TRS2=2e-7

+ CJO=6.3e-10 M=0.57 TT=1e-17 XTI=2) .MODEL DbreakMOD D (RS=1 TRS1= 1e-3 TRS2=-8.9e-6) .MODEL DplcapMOD D (CJO=6 .1e-10 IS=1e-30 N=10 M=0.41)

.MODEL MmedMOD NMOS (VTO=1.95 KP=10 IS=1e-30 N=10 TOX=1 L=1u W=1u RG=2.2 T_ABS=25) .MODEL MstroMOD NMOS (VTO=2.45 KP=250 IS=1e-30 N=10 TOX=1 L=1u W=1u T_ABS=25) .MODEL MweakMOD NMOS (VTO=1.65 KP=0.05 IS=1e-30 N=10 T OX=1 L=1u W=1u RG=22 RS=0.1 T_ABS=25)

.MODEL RbreakMOD RES (TC1 =8.3e-4 TC2=-8e-7) .MODEL RdrainMOD RES (TC1=1e-4 TC2=8e-6) .MODEL RSLCMOD RES (TC1=9e -4 TC2=1e-6) .MODEL RsourceMOD RES (TC1=7.5e-3 TC2=1e-6) .MODEL RvthresMOD RES (TC1=-1.7e-3 TC2=-8.2e-6) .MODEL RvtempMOD RES (TC1=- 2.6e-3 TC2=2e-7)

.MODEL S1AMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-4 VOFF=-3.5) .MODEL S1BMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-3.5 VOFF=-4) .MODEL S2AMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-2 VOFF=-1.5) .MODEL S2BMOD VSWITCH (RON=1e-5 ROFF=0.1 VON=-1.5 VOFF=-2) .ENDS

Note: For further discussio n of the PSP ICE mode l, consul t A New PSPICE Sub-Circuit for the Power MOSFET Featuring Global Temperature Options; IEEE Power Electronics Specialist Confere nce Records, 1991, written by William J. Hepp and C. Frank Wheatley.

SABER Electrical Model

rev January 2004 template FDD8876 n2,n 1,n3 =m_temp electrical n2,n1,n3 number m_temp=25 { var i iscl dp..model dbodymod = (isl=3e-12,ikf=10,nl=1.01,rs=3.4e-3,trs1=8e-4,trs2=2e-7,cjo=6.3e-10,m=0.57,tt=1e-17,xti=2) dp..model dbreakmod = (rs=1,trs1=1e-3,trs2=-8.9e-6) dp..model dplcapmod = (cjo=6.1e-10,isl=10e-30,nl=10,m=0.41) m..model mmedmod = (type=_n,vto=1.95,kp=10, is=1e-30, tox=1) m..model mstrong mod = (type=_n,vto=2.45,kp=250,is=1e-30, tox=1) m..model mweakmod = (type=_n,vto=1.65,kp=0.05,is=1e-30, tox=1,rs=0.1) sw_vcsp..model s1amod = (ron=1e-5,roff=0.1,von=-4,voff=-3.5) sw_vcsp..model s1bmod = (ron=1e-5,roff=0.1,von=-3.5,voff=-4) sw_vcsp..model s2amod = (ron=1e-5,roff=0.1,von=-2,voff=-1.5) sw_vcsp..model s2bmod = (ron=1e-5,roff=0.1,von=-1.5,voff=-2) c.ca n12 n8 = 1.9e-9 c.cb n15 n14 = 1.6e-9 c.cin n6 n8 = 1.55e-9

dp.dbody n7 n5 = model= dbodymod dp.dbreak n5 n11 = model=dbreakmod

ESG

dp.dplcap n10 n5 = model=dplcapmod spe.ebreak n11 n7 n17 n18 = 33.15

spe.eds n14 n8 n5 n8 = 1 spe.egs n13 n8 n6 n8 = 1 spe.esg n6 n10 n6 n8 = 1

GATE

1

LGATE

RLGATE

RGATE

9

EVTEMP +

18 22

20

spe.evthres n6 n 21 n19 n8 = 1 spe.evtemp n20 n6 n18 n22 = 1

i.it n8 n17 = 1 l.lgate n1 n9 = 4.7e-9

l.ldrain n2 n5 = 1.0e-9 l.lsource n3 n7 = 1.7e-9

CA

S1A

12

S1B

res.rlgate n1 n9 = 47 res.rldrain n2 n5 = 10 res.rlsource n3 n7 = 17

m.mmed n16 n6 n8 n8 = model=mmed mod, 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

res.rbreak n17 n18 = 1, tc1=8.3e-4,tc2=-8e-7 res.rdrain n50 n16 = 2.9e-3, tc1=1e-4,tc2=8e-6 res.rgate n9 n20 = 2.2 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=7.5e-3,tc2=1e-6 res.rvthres n22 n8 = 1, tc1=-1.7e-3,tc2=-8.2e- 6 res.rvtemp n18 n19 = 1, tc1=-2.6e-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

DPLCAP

10

RSLC2

6

8

EVTHRES

+

19

8

6

-

S2A

14

13

8

S2B

13

+

6

EGS EDS

8

-

15

CIN

CB

-

+

-

5

MSTRO

14

5 8

RSLC1

51

ISCL

50 RDRAIN

16

21

8

MMED

DBREAK

11

MWEAK

EBREAK

RSOURCE

RBREAK

17 18

IT

8

RVTHRES

+

17 18

7

RVTEMP 19

-

+

22

LDRAIN

RLDRAIN

DBODY

LSOURCE

RLSOURCE

VBAT

DRAIN

2

SOURCE

3

FDD8876 / FDU8876

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)*1e6/300))** 10)) } }

FDD8876 / FDU8876

PSPICE Thermal Model

REV 23 January 2004 FDD8876T CTHERM1 TH 6 7e-4

CTHERM2 6 5 9e-4 CTHERM3 5 4 2e-3 CTHERM4 4 3 2.5e-3 CTHERM5 3 2 6e-3 CTHERM6 2 TL 1.1e-2

RTHERM1 TH 6 7.0e-2 RTHERM2 6 5 1.1e-1 RTHERM3 5 4 2.2e-1 RTHERM4 4 3 3.2e-1 RTHERM5 3 2 4.9e-1 RTHERM6 2 TL 5e-1

SABER Thermal Model

SABER thermal model FDD8876T template thermal_model th tl thermal_c th, tl { ctherm.ctherm1 th 6 =7e-4 ctherm.ctherm2 6 5 =9e-4 ctherm.ctherm3 5 4 =2e-3 ctherm.ctherm4 4 3 =2.5e-3 ctherm.ctherm5 3 2 =6e-3 ctherm.ctherm6 2 t l =1.1e-2

rtherm.rtherm1 th 6 =7.0e-2 rtherm.rtherm2 6 5 =1.1e-1 rtherm.rtherm3 5 4 =2.2e-1 rtherm.rtherm4 4 3 =3.2e-1 rtherm.rtherm5 3 2 =4.9e-1 rtherm.rtherm6 2 tl =5e-1 }

RTHERM1

RTHERM2

RTHERM3

RTHERM4

RTHERM5

JUNCTION

th

CTHERM1

6

CTHERM2

5

CTHERM3

4

CTHERM4

3

CTHERM5

RTHERM6

2

CTHERM6

tl

CASE

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FDD8876 / FDU8876 Rev. A3

Rev. I34