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參數(shù)資料
| 型號(hào)： | MC33095 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Regulating Pulse-Width Modulator 16-PDIP -25 to 85 |
| 中文描述： | 積分發(fā)電機(jī)調(diào)節(jié)器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 165K |
| 代理商： | MC33095 |
MCCF33095 MC33095
6
MOTOROLA ANALOG IC DEVICE DATA
FUNCTIONAL DESCRIPTION
Introduction
This ignition control circuit was originally designed and
offered as an MCCF33095 Flip–Chip for use in 12 V
automotive alternator charging systems. The MCCF33095
consists of many protection features which are entailed in a
ten pin flip–chip package. The device was subsequently
made available in a 14 pin surface mount version
(MC33095D). Both versions perform in a similar manner. The
Flip–Chip version has an advantage over the surface mount
version where minimized space and higher operating
ambient temperatures are of major concern. Device
operation and application suggestions for both versions are
given below.
Oscillator
The oscillator frequency is determined by the value of an
external capacitor from the Oscillator pin to ground (see
applications circuit). The oscillator frequency in a typical
application is approximately 175 Hz, but a range of 50 Hz to
500 Hz can reasonably be used. The waveform generated
consists of a positive linear slope followed by relatively fast
negative fall (sawtooth). The flip–flops are reset by the falling
edge of the sawtooth signal as shown on the logic diagram.
The oscillator signal peaks at approximately 3.0 V and
provides the timing required for the device.
Ignition
The Ignition input signal enables the device turn–on when
the Ignition pin voltage is greater than 1.4 V. This signal
normally originates from the ignition switch of automotive
systems.
Sense
The Sense pin functions as a voltage sensor. It
proportionally senses the battery voltage and determines the
amount of time the Darlington transistor is high over the next
cycle. A low voltage at the Sense pin will result in a long duty
cycle for the Darlington while a high voltage produces a short
duty cycle. In the application, proportional control is used to
determine the duty cycle. Proportional control is defined as
the sense ratio of battery voltage, present on the Sense pin,
required to obtain a 20% to 95% duty cycle range in the
application. The 20% duty cycle value will correlate to the
maximum battery in the application. Normally the sense ratio
of battery voltage is an end product trim adjustment.
Lamp
The Lamp output pin functions as a warning indicator for
overvoltage and stopped engine or broken belt conditions
existing in the system.
Stator
The Stator pin senses the voltage from the stator in the
application circuit, and keeps the device powered up while
the stator voltage is high. Furthermore, it acts as a sense for
a stopped engine or broken belt condition. If this condition is
detected, the Stator turns “on” the Lamp.
Power Supply, VCC
The VCC pin powers the entire device and disables all
outputs during any overvoltage condition.
Roll–Off
The Roll–Off pin provides thermal protection for the circuit.
This capability exists, but has not been characterized and is
not tested for at this time. Therefore, it is recommended that
this pin be connected to ground. The surface mount version
has this pin internally connected to ground.
Darlington Drive
The purpose of the Darlington Drive output pin is to turn on
an external power Darlington transistor. The Sense pin
voltage determines the duty cycle of the Darlington. The
oscillator is set to maintain a minimum duty cycle, except
during overvoltage and short circuit conditions.
Short Circuit
The Short Circuit pin monitors the field voltage. When the
Darlington Drive and Short Circuit pins are simultaneously
high for a duration greater than the slew rate period, a short
circuit condition is noted. The detection time required
prevents the device from reacting to false shorts. As a result
of short circuit detection, the output is disabled. During a short
circuit condition, the device automatically retries with a 2%
duty cycle (Darlington “on” time). Once the short circuit
condition ceases, normal device operation resumes.
Application Notes
A capacitor should be used in parallel with the VCC pin to
filter out noise transients on the supply or battery line.
Likewise, a capacitor should be used in parallel with the
Sense pin to create a dominant closed loop pole. Resistors
connected to inputs, as mentioned in Notes 1 through 5 of the
Electrical Characteristic table, should be used.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MCCF33095 | INTEGRAL ALTERNATOR REGULATOR |
| MC33102D | DUAL SLEEP-MODE OPERATIONAL AMPLIFIER |
| MC33102P | DUAL SLEEP-MODE OPERATIONAL AMPLIFIER |
| MC33110D | LOW VOLTAGE COMPANDER |
| MC33110 | LOW VOLTAGE COMPANDER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MC33099CDW/R2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Adaptive Alternator Voltage Regulator |
| MC33099CDWR2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Adaptive Alternator Voltage Regulator |
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