MTD6501C 데이터 시트보기 (PDF) - Microchip Technology
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MTD6501C Datasheet PDF : 24 Pages
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MTD6501C/D/G
3.7 Boost Mode (MTD6501D)
The Boost mode is an optional BEMF pre-amplification
by a factor of three. The intention of Boost mode is to
compensate for motors with a low coupling coefficient
(= BEMF coefficient), thus allowing it to cover an even
wider range of motor characteristics. Notice that Boost
mode impacts the mechanical performance of the
motor altogether. In Boost mode, the speed of the
motor will adjust faster to variations of the control (VCC
or PWM) and/or of the load, including at start-up.
However, when the BEMF is amplified too much, the
mechanical performance (in terms of vibration and
acoustic noise) may start degrading. Thus, Boost mode
may be inappropriate for motors that already have a
good coupling coefficient. The optimum choice
between normal mode and Boost mode depends both
on the application requirements and on the motor
characteristics.
Refer to Table 3-1 for usage of Boost pin 9; leaving this
pin floating results in the normal mode of operation,
while tying this pin to GND activates Boost mode
(active low feature, internal pull-up).
TABLE 3-1:
POSSIBLE MODES OF
OPERATION BASED ON THE
BOOST PIN CONNECTION
BOOST Pin
Floating
Tied to GND
Mode of Operation
Normal
Boost
DS22263B-page 10
2010-2012 Microchip Technology Inc.
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