Dst3946dpj – Diodes DST3946DPJ User Manual
Page 3
DST3946DPJ
Document number: DS32040 Rev. 2 - 2
3 of 9
November 2012
© Diodes Incorporated
DST3946DPJ
0.000001
0.00001
0.0001
0.001
0.01
0.1
1
10
100
1,000
Fig. 1 Transient Thermal Response
t , PULSE DURATION TIME (s)
1
0.001
0.01
0.1
1
r(t),
T
R
AN
S
IEN
T
T
H
E
R
MA
L
R
ES
IS
T
AN
C
E
T - T = P * R
(t)
Duty Cycle, D = t /t
J
A
JA
1 2
θ
R
(t) = r(t) *
θJA
R
R
= 370°C/W
θ
θ
JA
JA
P(pk)
t
1
t
2
D = 0.7
D = 0.5
D = 0.3
D = 0.05
D = 0.02
D = 0.01
D = 0.005
D = Single Pulse
D = 0.9
D = 0.1
0.00001
0.001
0.1
10
1,000
Fig. 2 Single Pulse Maximum Power Dissipation
t , PULSE DURATION TIME (s)
1
1
10
100
1,000
P
(p
k
),
P
EA
K
T
R
A
N
SI
E
N
T
P
O
WE
R
(W
)
0.1
Single Pulse
T - T = P * R
(t)
Duty Cycle, D = t /t
J
A
JA
1 2
θ
R
(t) = r(t) *
θJA
R
R
= 370°C/W
θ
θ
JA
JA
0
0.1
0.2
0.3
0.4
0
20
40
60
80
100
120
140
160
T , AMBIENT TEMPERATURE ( C)
A
°
Fig. 3 Power Dissipation vs. Ambient Temperature
P
,
P
O
WE
R
DI
SS
IP
A
T
IO
N
(W
)
D