參數(shù)資料
型號(hào)： tca 3727
廠商： SIEMENS AG
英文描述： 2-Phase Stepper-Motor Driver(2相步進(jìn)式馬達(dá)驅(qū)動(dòng)器)
中文描述： 二相步進(jìn)電機(jī)驅(qū)動(dòng)器（2相步進(jìn)式馬達(dá)驅(qū)動(dòng)器）
文件頁(yè)數(shù)： 21/26頁(yè)
文件大小： 358K
代理商： TCA 3727
TCA 3727
Semiconductor Group
21
1998-12-16
Calculation of Power Dissipation
The total power dissipation
P
tot
is made up of
saturation losses
P
sat
quiescent losses
P
q
switching losses
P
s
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
tot
= 2
×
P
sat
+
P
q
+ 2
×
P
s
where
P
sat
I
N
{
V
satl
×
d
+
V
Fu
(1 –
d
) +
V
satuC
×
d
+
V
satuD
(1 –
d
) }
(transistor saturation voltage and diode forward voltages),
(quiescent current times supply voltage) and
(turn-ON / turn-OFF operations).
P
q
=
I
q
×
V
S
+
I
L
×
V
L
I
N
I
q
i
D
i
R
t
p
t
ON
t
OFF
t
DON
t
DOFF
= turn-OFFdelay
T
= cycle duration
d
= duty cycle
t
p
/
T
V
satl
= saturation voltage of sink transistor (T3, T4)
V
satuC
= saturation voltage of source transistor (T1, T2) during charge cycle
V
satuD
= saturation voltage of source transistor (T1, T2) during discharge cycle
V
Fu
= forward voltage of free-wheeling diode (D1, D2)
V
S
= supply voltage
V
L
= logic supply voltage
I
L
= current from logic supply
= nominal current (mean value)
= quiescent current
= reverse current during turn-on delay
= peak reverse current
= conducting time of chopper transistor
= turn-ON time
= turn-OFF time
= turn-ON delay
P
S
V
S
T
------
i
---------------------
t
2
i
-----------------------------
i
+
t
×
4
I
N
2
----
t
DOFF
t
OFF
+
+
+
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