OUTPUT STAGE
l The TA84002F is Multichip IC consisting of four
P−channel MOSFETs and one main chip.
l Four P−channel MOSETs are used as upper−side
power transistors.
l Output current is controlled by swiching
lower−side transistor.
l Durin CHOP ON, the current flows through
P−channel MOS, The motor winding, sink
transistor and sense resistor.
l During CHOP OFF, the current circulates the
motor winding, P−channel MOS and the diode of
P−channel MOS.
l Power dissipation is divided by the five chips.
: (1) CHOP ON
(Drive Mode)
Q1: ON, Q2: OFF
Q3: OFF, Q4: ON
: (2) CHOP OFF
(Slow Decay)
Q1: ON, Q2: OFF
Q3: OFF, Q4: OFF
: (3) ALL OFF
(Fast Decay)
TA84002F
3
2001-09-06