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L6219 Datasheet(PDF) 5 Page - Unisonic Technologies

Part No. L6219
Description  DUAL FULL-BRIDGE PWM MOTOR DRIVER
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
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L6219 Datasheet(HTML) 5 Page - Unisonic Technologies

   
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L6219
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
5 of 6
www.unisonic.com.tw
QW-R109-005,B
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
ITRIP
tOFF
tD
+
-
0
IOUT
LOAD CURRENT PATHS
VBB
RS
BRIDGE ON
SOURCE OFF
ALL OFF


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