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PDF 3625 Data sheet ( Hoja de datos )

Número de pieza 3625
Descripción POWERHALL SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS
Fabricantes Allegro MicroSystems 
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3625 AND
3626
CONTACT FACTORY
for availability
and latest information
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . See Table
Output Current, IO . . . . . . . . . . . . See Table
PWM Current Control Voltage,
VADJ . . . . . . . . . . . . . See Applications
Magnetic Flux Density, B . . . . . . Unlimited
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . . -65°C to +150°C
VCC(MAX)
IO(CONT)
IO(PEAK)
UDN3625M
14 V
1.0 A
1.6 A
UDN3626M
26 V
0.45 A
0.75 A
Output current rating will be limited by
ambient temperature, supply voltage, and
duty cycle. Under any set of conditions, do
not exceed a junction temperature of
+150°C.
POWERHALL® SENSOR/DRIVERS
FOR BRUSHLESS DC MOTORS
Requiring a minimum of external components, the UDN3625M
and UDN3626M are monolithic ICs that provide single-chip control
and direct drive solutions for many small, single-phase, unipolar
brushless dc motor applications. Integrated into the ICs are a high-
sensitivity Hall-effect sensor, control and commutating logic, a stable
voltage regulator, extensive self and system protective functions, and
two high-current saturated npn outputs. Both ICs include thermal
shutdown, output over-current limiting, and output transient protection/
flyback diodes. The UDN3625M is nominally for 12 V motor applica-
tions while the UDN3626M is better suited to 24 V motors.
Output over-current limiting (relating to startup surge or a locked
rotor condition) and short-circuit protection are provided by an internal
current-sense resistor. The maximum (default) output load current is
typically 1.3 A for the UDN3625M or 600 mA for the UDN3626M,
but may be decreased by user selection of an external low-wattage
resistor.
A separate low-level output provides tachometer capability for
motor speed control or sensing a locked rotor condition. With appro-
priate external logic, pulse-width modulated (PWM) speed control can
be accomplished at the output current adjust pin.
These sensor/drivers are supplied in an 8-pin mini-DlP plastic
package with a copper leadframe for increased package power
handling capability.
FEATURES
s 900 mA /12 V or 400 mA /24 V Operation
s Speed-Control (PWM) Capability
s Locked-Rotor Indication
s Minimum External Components
s Over-Current Protected
s Thermal Protection
s Enhanced Reliability
s Reduced Cost
Always order by complete part number, e.g., UDN3625M .
See Maximum Ratings at left.

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3625 pdf
SENSOR LOCATION
3625 AND 3626
POWERHALL®
SENSOR/DRIVERS FOR
BRUSHLESS DC MOTORS
APPLICATIONS INFORMATION
Power Dissipation. Care should be taken in evaluating the package power
dissipation of these devices. Total power dissipated by the device will consist
of power due to the internal regulator, logic and drive circuitry (ICC x VCC),
power due to the output drivers (IO x VO(SAT)), and power due to the clamp
circuitry (ICL x VCL x duty cycle).
For example:
ICC x VCC = 38 mA (max) x 14 V = 532 mW (max)
IO x VO(SAT) = 450 mA x 0.4 V (max) = 180 mW (max)
ICL x VCL x duty cycle = 450 mA x 15 V (max) x 1% = 67.5 mW (max)
Total package power dissipation = 779.5 mW (max)
Some of the power dissipated by the device (ICC x VCC) can be reduced
by inserting a Zener diode in the supply line (ZA in the figure). Note that the
voltage at the VCC pin under worst-case conditions must be greater than the
minimum operating voltage (6.5 V).
Transient Protection. A note of caution concerns negative (below ground)
excursions of the outputs. In application, the coupling of the two motor
windings can provide for just such a case. Reducing the coupling between
windings will help, but ground clamp diodes or diodes in series with the
motor windings might be required (DC or DS in the figure). Most small
brushless motors will not require these diodes.
System requirements usually utilize a diode type of reverse-polarity
protection. If series diode protection is used with an inductive load (the usual
fan application), a Zener clamp between VS and ground (ZB in the figure) is
required. The Zener voltage must be greater than the supply voltage but less
than the rated maximum allowable supply voltage.
With diode reverse-polarity protection, a high-impedance supply, or a
switched supply line, high-voltage spikes will be generated (especially with
high-current or high-inductance loads) during normal operation, coasting, or
immediately after turn-off. In these situations, a Zener clamp (ZB) from VS to
ground will be required.
Over-Current Adjust Pin. The over-current limit may be reduced from the
default value (IO MAX) by selection of an external resistor (RADJ) at the
PWM/IO ADJ pin.

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