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參數(shù)資料
| 型號： | MC33094 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Regulating Pulse-Width Modulator 16-PDIP -25 to 85 |
| 中文描述： | 點火控制 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 352K |
| 代理商： | MC33094 |
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Figure 7. Output Clamp Voltage
versus Temperature
Figure 8. Output Clamp Dynamic Impedance
versus Temperature
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Figure 9. Supply Drain Current
versus Temperature
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Block Diagram Description
(Figure 10)
The Band–Gap Reference generates a nominal 1.2 V
having very good stability with temperature variations. The
Band–Gap Reference conceptually provides a low
temperature drift voltage by summing a strongly negative
Temperature Coefficient (TC) voltage with an equally strong
positive TC voltage. The negative TC voltage element is a
result of a transistor emitter–to–base voltage while the
positive TC voltage is developed as a result of a positive TC
current imposed across a resistor. The positive TC current
relies on the matching of currents in different sizes of
transistors. The result is a very stable reference voltage
independent of temperature variations. The Band–Gap
Reference voltage provides a thermally stable voltage
reference for critically sensitive circuits within the IC. It also
sets the master bias current for all precision currents on the IC.
The V
r
Zener Reference block contains a 6.75 V zener
regulator, which also exhibits a very low temperature
coefficient.
The V
CC
Comparator and Clamp block limits the V
CC
voltage to one V
be
plus three zener drops in addition to
comparing the V
CC
voltage to 15 and 22 V. When the V
CC
voltage is greater than either of these two values, the IC
changes the adaptive capacitor discharge rate and when
above 22 V the IC forces the coil current to shutdown. The
minimum V
CC
value the IC will operate at is 4.0 V and V
bat
of
5.0 V. Below 7.5 V, the V
r
reference is no longer maintained,
and the IC consumes excess power and excess voltage is
dropped in the external V
CC
resistor.
The Master Bias Current Reference block generates
precise currents used throughout the IC. The MB pin is held
at 1.2 V by a differential amplifier with feedback. Capacitive
loading on the MB pin reduces the effectiveness of the
internal dominant pole, and loading as modest as 200 pF
may cause the differential amplifier to oscillate.
The Input Voltage Comparator block requires an input
signal between ground and V
bat
and detects the swing in the
input signal. The thresholds for the input comparator are
approximately 56.2% of V
bat
for rising signals and 36% of
V
bat
for falling signals. The input signal may come from a Hall
effect sensor or reluctor sensor on the distributor.
The Negative Edge Filter block is an inverting buffer for the
signal from the Input Voltage Comparator and has a time
constant of approximately 0.1
μ
s for rising edges and 500
μ
s
for falling edges.
The Adaptive Capacitor Charging and Sensing block
charges, discharges, and senses the adaptive capacitor
voltage. The adaptive capacitor has a single charge rate of
8.4
μ
A and two discharge rates. The 1.688
μ
A slow discharge
rate is used only during very high V
CC
operation and
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MC33094DW | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC33095 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:INTEGRAL ALTERNATOR REGULATOR |
| MC33095D | 制造商:Freescale Semiconductor 功能描述:Integra Alternator Regulator |
| MC33099 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Adaptive Alternator Voltage Regulator |
| MC33099CDW | 制造商:Freescale Semiconductor 功能描述:Adaptive Alternator Voltage Regulator |
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