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PDF L6219 Data sheet ( Hoja de datos )
| Número de pieza | L6219 | |
| Descripción | DUAL FULL-BRIDGE PWM MOTOR DRIVER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L6219 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
L6219
LINEAR INTEGRATED CIRCUIT
DUAL FULL-BRIDGE PWM
MOTOR DRIVER
DESCRIPTION
The L6219 motor driver is designed to drive both windings of a
bipolar stepper motor or bidirectionally control two dc motors. Both
bridges are capable of sustaining 45V and include internal
pulse-width modulation (PWM) control of the output current to
750mA .The outputs have been optimized for a low output saturation
voltage drop (less than 1.8V total source plus sink at 500mA ).
For PWM current control, the maximum output current is
determined by the user’s selection of a reference voltage and
sensing resistor. Two logic-level inputs select output current limits of
0, 33, 67,or 100% of the maximum level. A phase input to each
bridge determines load current direction.
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated delays
prevent cross-over currents when switching current direction. Special
power-up sequencing is not required. Thermal protection circuitry
disables the outputs if the chip temperature exceeds safe operating
limits.
FEATURES
*Interchangeable with SGS L6219
*750mA Continuous Output Current
*45V Output Sustaining Voltage
*Internal Clamp Diodes
*Internal PWM Current Control
*low Output Saturation Voltage
*Internal Thermal Shutdown Circuitry
www.DataSheet4U.com
SOP-24
*Pb-free plating product number: L6219L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
L6219-S24-R
L6219L-S24-R
L6219-S24-T
L6219L-S24-T
Package
SOP-24
SOP-24
Packing
Tape Reel
Tube
L6219L-S24-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) S24: SOP-24
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 6
QW-R109-005,B
1 page  
L6219
LINEAR INTEGRATED CIRCUIT
PWM CURRENT CONTROL
The L6219 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/10Rs
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, circulating through
the ground-clamp diode and sink transistor. The source driver’s off time (and therefore the magnitude of the current
decrease)is determined by the monostable’s external RC timing components, where tOFF=RTCT within the range of
20kΩ to 100kΩ and 100pF to 1000pF
When the source driver is re-enabled, the winding current (the sense voltage) is again allowed to rise to the
comparator’s threshold. This cycle repeats itself, maintaining the average motor winding current at the desired level.
Loads with high distributed capacitances 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 further delay the action of the comparator. Depending on load type,
many applications will not require these external components (SENSE connected to COMP IN).
PWM OUTPUT CURRENT WAVE FORM
VPHASE
LOAD CURRENT PATHS
VBB
IOUT+
0
-
ITRIP
tD tOFF
RS BRIDGE ON
SOURCE OFF
ALL OFF
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 6
QW-R109-005,B
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet L6219.PDF ] | |
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