M54679FP Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC
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M54679FP Datasheet PDF : 9 Pages
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PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI <CONTROL / DRIVER IC>
M54679FP
2-PHASE STEPPER MOTOR DRIVER
OUTPUT CIRCUIT (Ta = 25deg, VCC = 5.0V, VM = 24V unless otherwise noted.)
Symbol
Vsat
Ileak
VF(H)
VF(L)
tdon
tdoff
Parameter
Output saturation voltage
Output leakage current
VF of flywheel diode (Top)
VF of flywheel diode (Bottom)
Turn ON delay of output
Turn OFF delay of output
Conditions
Top and Bottom at Load current 0.6A.
If = 0.6A
If = 0.6A
Time until output become ON since S > Vref
Time until output become OFF since S < Vref
Min.
—
-100
—
—
—
—
Limits
Typ.
1.6
—
1.7
1.1
0.5
2.0
Max.
2.2
+100
2.3
1.5
2.0
3.5
Units
V
µA
V
V
µS
µS
FUNCTION EXPLANATION
(1). Ph inputs make a decision the output function.
Ph*A
L
H
L
H
Ph*B
L
L
H
H
Out*A
OFF
H
L
OFF
Out*B
OFF
L
H
OFF
*: 1 or 2
The outputs shut off under Ph*A and Ph*B High
condition at the same time.
(2). Output current and terminal of output current setting.
I0
I1
L
L
H
L
L
H
H
H
Output current ratio
100%
70%
30%
0%
Current sensing comparators
threshold voltage (Vref=5V)
500mV
350mV
155mV
—
(3). Equivalent circuit of Vref terminal.
The equivalent circuit of Vref terminal is shown in right circuit.
As Vref terminal needs typical 500µA input current, consider
this value when Vref voltage is set.
(4). Current sensing comparators.
The current sensing comparators compare the voltage (VRS)
of current sensing resistor and threshold voltage (VCH) of this
comparators, then if VRS > VCH, the comparators output
change and shut off the output.
(5). Oscillation circuit.
External capacitor is charged and discharged by the constant
current and a triangular waveform appears to Vref terminal.
The waveform voltage level is shown in right figure.
This triangular waveform is a carrier frequency of PWM circuit.
The carrier frequency change if this external capacitor value is
changed.
M54679FP is designed that the oscillation frequency is 30kHz
if the external capacitor value is 390pF.
The oscillation frequency is in inverse proportion to the value of
a external capacitor.
Vref
18k
3.5k 0.68k
2k
I0
I1
2.5V
0.5V
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