ML4423 查看數據表（PDF） - Micro Linear Corporation
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ML4423 Datasheet PDF : 10 Pages
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PIN DESCRIPTION
PIN NAME
1 FB A
2 FB C
3 FB B
4 VMIN
5 VSPEED
6 RSPEED
7 VREF
8 RREF
9 RDT
10 SINE A-C
11 SINE B-C
12 CO
FUNCTION
Differential input which, in
conjunction with FB C, feeds back the
voltage applied across motor winding
A-C.
Input which feeds back the voltage
applied to motor winding C. Reference
voltage for windings A and B.
Differential input which, in
conjunction with FB C, feeds back the
voltage applied across motor winding
B-C.
The voltage on this pin sets the
minimum sinewave amplitude at low
speeds.
The voltage on this pin sets the
frequency and amplitude of the
sinewaves generated at SINEA and
SINEB.
An external resistor to ground provides
a variable current to the sinewave
generator. The current is proportional
to VSPEED.
8V reference output which can be
used for setting VSPEED and VMIN.
An external resistor to ground provides
a constant current used for setting the
PWM frequency in conjunction with
CT.
An external resistor to ground sets the
deadtime in the output stage to
prevent cross-conduction in the power
devices.
A test output for observing the
internally generated sinewave used for
motor winding A-C.
A test output for observing the
internally generated sinewave used for
motor winding B-C.
An external capacitor to ground sets
the sinewave frequency in conjunction
with VSPEED and RSPEED.
ML4423
PIN NAME
13 CT
14 COAST
15 F/R
16 ISENSE
17 GND
18 3PH/2PH
19 LB
20 LC
21 LA
22 HB
23 HC
24 HA
25 5V/12V
SELECT
26 VDD
27 CGM1
28 CGM2
FUNCTION
An external capacitor to ground sets
the PWM triangle frequency in
conjunction with the external resistor
RREF.
A logic low input causes all output
drive transistors to turn OFF. An
internal pull-up drives COAST to VDD
if left unconnected.
A logic high input causes phase A to
lead phase B, while a logic low input
causes phase A to lag phase B. An
internal pull-up drives F/R to VDD if
left unconnected.
Motor current sense input.
Signal and power ground.
Leaving this pin unconnected selects
3-phase drive. Connecting this pin to
VDD selects single/2-phase drive.
Low side drive output for phase B.
Low side drive output for phase C.
Low side drive output for phase A.
High side drive output for phase B.
High side drive output for phase C.
High side drive output for phase A.
Input to select 5V or 12V output drive.
Leaving this pin unconnected selects
5V output drive levels at the driver
outputs. Connecting this pin to VCC
selects 12V output drive levels at the
driver outputs.
12V power supply input.
An external capacitor to ground sets a
pole in the feedback loop.
An external capacitor to ground sets a
pole in the feedback loop.
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