Data Sheet

SWS1000L
DENSEI-LAMBDA R-2
2.
Component derating
MODEL : SWS1000L-5
(1) Calculating method
(a) Measuring Conditions
Input : 115 , 230VAC Ambient temperature : 50°C
Output : 5V 200A (100%) Mounting method : Mounting A
(b) Semiconductors
Compared with maximum junction temperature and actual one which is calculated
based on case temperature, power dissipation and thermal impedance.
(c) IC, Resistors, Capacitors, etc.
Ambient temperature, operating condition, power dissipation and so on are within
derating criteria.
(d) Calculating Method of Thermal Impedance
θ =
T-T
P
j-c
j(max) c
c(max)
θ j-a
j(max) a
c(max)
=
T-T
P
θ j-l
j(max) l
c(max)
=
T-T
P
: Case temperature at start point of derating ; 25°C in general
: Ambient temperature at start point of derating ; 25°C in general
: Lead temperature at start point of derating ; 25°C in general
(
P
ch(max)
)
(
T
ch(max)
)
(
θ
ch - c
)
: Thermal impedance between junction and air
: Thermal impedance between junction and lead
: Maximum collector(channel) dissipation
: Maximum junction(channel) temperature
: Thermal impedance between junction(channel) and case
T
c
T
a
T
l
P
c(max)
T
j(max)
θ
j-c
θ
j-a
θ
j-l