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PDF APX6219 Data sheet ( Hoja de datos )
| Número de pieza | APX6219 | |
| Descripción | PWM Stepper Motor Driver | |
| Fabricantes | Anpec Electronics | |
| Logotipo |  |
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APX6219
PWM Stepper Motor Driver
Features
General Description
• Able to Drive Both Windings of Bipolar Stepper
Motor
• Up to 750 mA Continuous Output Current for
Each Winding
• Up to 28V Output Sustaining Voltage
• Internal PWM Current Control
• Built-in Protection Diode
• Low Output Saturation Voltage
• Internal Thermal Shutdown
• Lead Free Available (RoHS Compliant)
Applications
• Scanner
• Stepping Motor Control
• Thermal Printer
The APX6219 is designed to drive both winding of a
two-phase bipolar stepper motor or bidirectionally
control 2 DC motors. APX6219 includes two H-
bridges capable of continuous output current of ±750
mA with peak start up to 1A and operating voltages
up to 28V. Motor winding current can be controlled
by the internal fixed-frequency, pulse-width modulated
(PWM), current-control circuitry. Wide range current
control is controlled by means of two logic inputs with
a external reference voltage for each bridge. The peak
load current limit is set by the user’s selection of a
reference voltage and current-sensing resistor. Two
logic-level select output current limits of 0%,33%,
67%, or 100% of the maximum level. A phase input
to each bridge determines load current direction. A
thermal shutdown protection circuit disables the out-
puts if the chip temperature over the safe operation
limit. The APX6219 come in SOP-24 package.
Pin Configuration
OUT1A
OUT2A
SENSE2
COMP.INPUT2
OUT2B
GND
GND
l02
I12
PHASE2
VREF2
RC2
1
2
3
4
5
6
7
8
9
10
11
12
24 VBB(LOAD SUPPLY)
23 SENSE1
22 COMP.INPUT1
21 OUT1B
20 l01
19 GND
18 GND
17 l11
16 PHASE1
15 VREF1
14 RC1
13 VCC(LOGIC SUPPLY)
SOP-24 (Top View)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright ANPEC Electronics Corp.
Rev. A.4 - Apr., 2005
1
www.anpec.com.tw
1 page  
APX6219
PWM Output Current Waveform
VPHASE
+
IOUT 0
-
Load Current Paths
IT R IP
ITRIP=VREF/10 RS
td toff
VBB
m o to r
B ridge on
Rs S ource off
A ll off
Copyright ANPEC Electronics Corp.
Rev. A.4 - Apr., 2005
5
www.anpec.com.tw
5 Page 
APX6219
Application Information
PWM Current Control
Logic Control Of Output Current
The APX6219 dual bridge is designed to drive both
windings of a bipolar stepper motor. Output current is
sensed and controlled independently in each bridge
by an external sense resistor (RS), internal comparator,
and monostable multivibrator. When the bridge is
turned on, current increases in the motor winding and
it is sensed by the external sense resistor until the
sense voltage (VCOMPIN) reaches the level set at the
comparator’s input:
ITRIP = VREF/10 RS
The comparator then triggers the monostable which
turns off the source driver of the bridge. The actual
load current peak will be slightly higher than the trip
point (especially for low-inductance loads) because of
the internal logic and switching delays. This delay (TD)
is typically 2µs. After turn-off, the motor current
decays, going through the ground-clamp diode and
sink transistor (source off). The source driver’s off time
is determined by the external RC timing components,
where TOFF = RTCT within the range of 30kΩ to 100kΩ
and 470pF to 1000pF.When VRC drop to certain
voltage, the source driver will be re-enabled automati-
cally (bridge on), the winding current is again limited
at the desired level.
Loads with high VBB, low L , high-frequency and low
current will may result in high turn-on current peaks.
This peak (appearing across RS) will attempt to trip
the comparator, resulting in erroneous current control
or high-frequency oscillations. An external RCCC time
delay should be used to form low pass filter to reduce
noise to avoid the comparator’s fault operation. The
locations of RC, CC, RC components should be as close
to the APX6219 as possible.
Two logic level inputs (l0 and I1) allow digital selection
of the motor winding current at 100%, 67%, 33%, or
0% of the maximum level per the table. The 0% out-
put current condition turns off all drivers in the bridge
and can be used as an OUTPUT Disable/Enable
function.
During half-step operations, the l0 and l1 allow the µP
to control the motor at a constant torque between all
positions in an eight-step sequence. This is accom-
plished by digitally selecting 67% drive current when
two phases are on. When all drivers are turn off will
make rapid current decay when phases be changed.
This helps to ensure proper motor operation at high
step rates.
The logic control inputs can also be used to select a
reduced current level (and reduced power dissipation)
for ‘hold’ conditions and/or increased current (and avail-
able torque) for start-up conditions.
General
The PHASE input to each bridge determines the di-
rection motor winding current flows. An internally gen-
erated deadtime (approximately 2µs) prevents shoot
through that can occur when switching the PHASE
input. Thermal protection circuitry turns off all drivers
when the junction temperature reaches +150°C. It is
only intended to protect the device from failures due
to excessive junction temperature and should not im-
ply that output short circuits are permitted. The out-
put drivers are re-enabled when the junction tempera-
ture cools to +130°C.
The APX6219 output drivers are optimized for low out-
put saturation, less than 2V (source plus sink) at load-
ing 500mA.Under normal operating conditions, this
allows continuous operation of both bridges simulta-
neously at 750mA (such as Typical Application).
Copyright ANPEC Electronics Corp.
Rev. A.4 - Apr., 2005
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet APX6219.PDF ] | |
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