TCA 3727G Infineon Technologies, TCA 3727G Datasheet - Page 18

• Manufacturer Part Number: TCA 3727G
• Manufacturer: Infineon Technologies

Specifications of TCA 3727G

• Packages: PG-DSO-24
• Ipeak: 2 x 1.0 A
• Inhibit: Y
• Iq (typ): 20.0 µA
• Mounting: SMT
• Technology: Bipolar

Calculation of Power Dissipation
The total power dissipation
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The following equations give the power dissipation for chopper operation without phase reversal. This is the worst
case, because full current flows for the entire time and switching losses occur in addition.
P
where
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•
P
•
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•
•
•
•
•
•
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Data Sheet
S
tot
saturation losses
quiescent losses
switching losses
P
P
I
I
i
i
t
t
t
t
t
T = cycle duration
d
V
V
V
V
V
V
I
= 2
D
R
p
ON
OFF
DON
DOFF
N
q
L
V
------
sat
q
satl
satuC
satuD
Fu
S
L
T
= duty cycle
= conducting time of chopper transistor
= quiescent current
= reverse current during turn-on delay
= peak reverse current
= current from logic supply
S
= nominal current (mean value)
=
= logic supply voltage
= supply voltage



= turn-ON time
= forward voltage of free-wheeling diode (D1, D2)
= turn-OFF time
= saturation voltage of sink transistor (T3, T4)
i
----------------------
= turn-ON delay
I
D
= turn-OFF delay
q
P
I
= saturation voltage of source transistor (T1, T2) during charge cycle
= saturation voltage of source transistor (T1, T2) during discharge cycle
N
sat
2
t
{
V
DON
V
+
S
satl
P
+
+
q
I
t
i
------------------------------
+ 2
L
p
D
d
/T
+
+
V
i
P
P
P
R
4
V
L
s
q
sat
P
Fu
(turn-ON / turn-OFF operations).
(quiescent current times supply voltage) and
s
t
ON
(transistor saturation voltage and diode forward voltages),
(1 -
P
tot
+
I
---- -
d
2
is made up of
N
) +
t
DOFF
V
satuC
+
t
OFF



d
+
V
satuD
(1 -
20
d
)}
Rev. 2.2, 2009-01-22
TCA3727G
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