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参数资料
| 型号： | PC33094DW |
| 厂商： | MOTOROLA INC |
| 元件分类： | 消费家电 |
| 英文描述： | IGNITION CONTROL |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| 封装： | PLASTIC, SO-16 |
| 文件页数： | 9/16页 |
| 文件大小： | 352K |
| 代理商： | PC33094DW |
9
MOTOROLA ANALOG IC DEVICE DATA
represents an effort to reduce excess dwell and therefore
power dissipation during high voltage operation. The 5.88
μ
A
discharge rate is used under normal V
CC
operating
conditions. Under a start mode, this block will discharge the
adaptive capacitor forcing an enhanced start mode dwell.
The start/run modes are set internally by detecting the engine
frequency, which corresponds to the ramp capacitor voltage.
The Stall Capacitor Charging and Sensing block controls
the charging and discharging rates of the stall capacitor. The
charging rate is 31.5
μ
A, and the two discharging rates are
1.0
μ
A and 7.0
μ
A. The stall capacitor potential commands
the IC to maintain or reduce the coil current. When the engine
is turning very slowly (or stalled), the stall capacitor will have
enough time to discharge below threshold and thereby
reduce coil current. The output current limiter (see Output
Current Driver and Limiter block description below) forces the
coil current to be proportional to the stall capacitor voltage
when the stall capacitor voltage is less than 2.0 V.
The Ramp Capacitor Charging and Sensing block charges
the ramp capacitor at approximately 8.4
μ
A and discharges it
at about 33.6
μ
A. The charging circuit is always on and
sources current during the “not 25%” part of the engine cycle.
The discharging circuit is only on and sinking current during
the “25%” part of the engine cycle. The positive edge of the
distributor input signal sets the 25% mode, and the ramp
comparator output clears this mode.
The CR > CA Adaptive Comparator block signals the point
where the ramp capacitor voltage is greater than the adaptive
capacitor voltage. The point at which the two capacitor
voltages are equal is the point where charging of the coil is
begun. The adaptive algorithm used in the IC maintains the
required excess dwell throughout all reasonable
accelerations and decelerations without causing excess coil
power dissipation, in addition, it insures that more than
adequate spark energy is available for very high engine
speeds, when excess dwell is impossible.
The Output Current Driver and Limiter block sources a
limited supply current of about 50 mA to the base of the
Darlington power transistor. The Darlington will cause the
coil to conduct to about 6.5 amps and the voltage drop on
the IS pin of the IC will rise to the threshold of the current
limiter. The current limiter will then hold the coil current at that
level until either a spark is commanded by the logic block, or
the engine begins to stall (causing the coil to slowly
discharge).
The Internal Logic block performs the required memory
and gating functions on the IC to implement the adaptive
ignition control algorithm.
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Figure 10. Block Diagram
C
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
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