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| 型号： | MCZ33094EGR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC IGNITION CONTROL 12V 16-SOIC |
| 标准包装： | 1,000 |
| 应用： | 自动 |
| 电源电压： | 6 V ~ 16 V |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
Analog Integrated Circuit Device Data
12
Freescale Semiconductor
33094
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The MC33094DW is designed for engine compartment
use in 12 V automotive ignition applications to provide high
performance control of the ignition coil when used with an
appropriate Freescale Power Darlington Transistor. Engine
control systems utilizing these devices for ignition coil control
exhibit superior fuel efficiency and lower exhaust emissions
over predecessor systems. The device is designed for single
input control from a Hall sensor to determine crankshaft
position.
The device, a bipolar linear integrated circuit, is built using
high–density Integrated–Injection Logic (IIL) processing
incorporating high current–gain PNP and NPN transistors. All
module inputs are transient voltage protected through the
use of resistors, capacitors, and/or zener diodes working in
conjunction with internal protection elements. These
elements provide protection of critical circuitry from externally
induced high–voltage transients which may degrade the
devices operational performance. At the module level, it is
recommended that the VCC pin of the device be transient
decoupled using an external resistor and capacitor to work in
conjunction with the on–chip internal zener string to provide
robust module protection of the device power pin. The D
(Distributor Signal) input of module should be protected from
transients through the use of an external resistor and zener
diode. The Start input (ST) of the module should be
decoupled through the use of two resistors and a capacitor to
work in conjunction with the on–chip internal clamp
(Figure 13).
The output of the device incorporates a high current–gain
PNP designed to drive an external power Darlington
transistor to provide control of the ignition coil. The output
drive is carefully synchronized with the output from the
distributor. The charging and discharging of three capacitors,
external to the device, provide timing signals which program
the dwell and charge time control of the ignition coil over a
wide rpm range.
The timing and charge/discharge rates of the three
external capacitors are accurately controlled by internal
circuitry acted upon by sensor and distributor signal detection
of the device.
A feedback path from the emitter of the external power
Darlington transistor to the device provide monitoring of the
ignition coil current. An internal comparator of the device
senses and limits the maximum ignition coil current to
approximately 6.5 amps. Other circuitry within the device
provides an interruption of the coil current so as to generate
the spark, or slowly discharges the coil in a controlled manner
so as to prevent a spark and limit the total module energy
dissipation.
When the external Darlington is switched off, the
Darlington collector will instantly experience a dramatic
increase in voltage as a result of the collapsing field of the
ignition coil (inductive kick). The external voltage divider
working in conjunction with the internal device zener string
and power PNP form a dynamic clamp which limits the
inductive kick voltage to less than 350 V. This feature
protects the Darlington transistor from damaging stress or
breakdown.
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
BLOCK DIAGRAM DESCRIPTION (Figure 2)
The Band–Gap Reference generates a nominal 1.2V
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 VR Zener Reference block contains a 6.75 V zener
regulator, which also exhibits a very low temperature
coefficient.
The VCC Comparator and Clamp block limits the VCC
voltage to one VBE plus three zener drops in addition to
comparing the VCC voltage to 15 and 22V. When the VCC
voltage is greater than either of these two values, the IC
changes the adaptive capacitor discharge rate and when
above 22V the IC forces the coil current to shutdown. The
minimum VCC value the IC will operate at is 4.0V and VBAT of
5.0V. Below 7.5V, the VR reference is no longer maintained,
and the IC consumes excess power and excess voltage is
dropped in the external VCC resistor.
The Master Bias Current Reference block generates
precise currents used throughout the IC. The MB pin is held
at 1.2V 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 200pF may
cause the differential amplifier to oscillate.
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| MCZ33099CEG | 功能描述:线性稳压器 - 标准 ALT. VOLT REG 14.6 RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MCZ33099CEGR2 | 功能描述:线性稳压器 - 标准 ALT. VOLT REG 14.6 RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MCZ33099EG | 功能描述:线性稳压器 - 标准 ALT. VOLT REG 14.8 RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MCZ33099EGR2 | 功能描述:线性稳压器 - 标准 ALT. VOLT REG 14.8 RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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