參數(shù)資料
型號(hào)： MCZ33094EG
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 9/24頁(yè)
文件大?。?/td> 0K
描述： IC IGNITION CONTROL 12V 16-SOIC
標(biāo)準(zhǔn)包裝： 47
應(yīng)用： 自動(dòng)
電源電壓： 6 V ~ 16 V
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 管件
安裝類型： 表面貼裝
Analog Integrated Circuit Device Data
Freescale Semiconductor
17
33094
TYPICAL APPLICATIONS
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 350V. This feature protects
the Darlington transistor from damaging stress or breakdown.
IGNITION CIRCUIT OPERATION DESCRIPTION
When initially powered up, all module capacitors start
discharged (0V). The VCC capacitor will power up first, and
the IC’s internal logic latches are indeterminate. The following
conditions will hold: STALL = 1, because the stall capacitor
voltage is less than 2.0 V; 25% = 0, because the ramp
capacitor is less than the Band Gap Reference voltage (VBG);
and ICOIL = 0 amps, because the stall capacitor is at 0V.
Because 25% = 0, the ramp capacitor charges towards
VR. At cranking frequencies, the ramp capacitor always
exceeds the start mode threshold at the input (ZC), and
therefore the stall signal resets the start mode latch upon the
first ac signal (this causes the adaptive capacitor to be
discharged). With the adaptive capacitor held low, very high
rates of acceleration are possible. If the adaptive capacitor
were allowed to adapt the dwell at low frequencies, severe
limitations to engine acceleration would occur.
See Figure 14. At point A, a spark from the previous cycle
occurs as the field around the coil collapses rapidly. At the
same time ZC (ZC (input) = high(1)) will set the 25% clock
signal which commands the adaptive and ramp capacitors to
discharge and the stall capacitor to charge. At point B, as the
ramp capacitor voltage crosses the 1.2V (VBG) level, the 25%
clock is cleared and the polarities and amplitude of the ramp
and stall capacitor currents change to their appropriate
levels. At this point the adaptive capacitor is discharged and
begins to float. At point C, the coil turns on and ramps until
the coil current is limited to 6.5 amps. The adaptive capacitor,
at point D, remains discharged and the dwell is maximized to
6.5 amps because the start/run latch has yet to be set. At
point E, ZC (ZC = high) turns the coil off causing a spark to
occur and at which point a new cycle begins. As the engine
frequency increases, the peak voltage on the ramp capacitor
at the ac signal will fall below the start mode enable threshold
level. The start mode enable detector then sets the start/run
latch to the run mode (CADUMP = 0) by clocking a zero into
the start/run latch at the zero cross. At this time the adaptive
algorithm is evoked and the adaptive capacitor is allowed to
charge and discharge according to it’s other logical inputs.
After normal run mode operation is entered, the start mode
may not be reentered even though the ramp capacitor
voltage again exceeds the start mode enable threshold. A
start mode may only be evoked by a STALL signal transition
from logic 1 to 0. The STALL signal transition occurs at a ZC
frequency of approximately 2.0 Hz.
The IC and circuit provides for other than normal starting
procedures such as push starting the engine. Since the stall
capacitor will be discharged in this low frequency mode, the
IC will provide a spark timing with a maximum retardation of
about 6.5 ms.
After the start mode operation is exited, the normal
operation algorithm is entered and a different sequence of
events dominate the IC’s performance. See Figures 16,
Figures 17 and Figures 18. At point A, the spark from the
previous cycle occurs and the 25% part of the cycle begins.
During this part of the cycle, the stall capacitor will charge and
the ramp and adaptive capacitors will discharge. At point B,
the “not 25%” part of the cycle, also called the 75% part of the
cycle, begins. The stall capacitor discharges, while the ramp
capacitor charges. During this part of the cycle the adaptive
capacitor floats. At point C, the ramp capacitor voltage equals
the voltage on the adaptive capacitor. At this time, the coil
turns on and the coil current ramps to the point where it is
limited. When the coil current reaches the limit, point D, the
adaptive capacitor begins to charge, until zero cross (ZC =
1logic(high)), point E. This turns the coil off and induces a
spark. The 75% part of the cycle lasts until point E, at which
time the cycle begins again.
The adaptive dwell algorithm causes the engine to
maintain a fixed percent of excess dwell time (if possible).
The mechanism that permits this involves the floating nature
of the adaptive capacitor. During engine deceleration, the
initial coil turn–on might occur early, but the next coil turn–on
will be retarded to it’s correct location due to the % adjusted
adaptive capacitor charge time. During acceleration, the coil
may not charge up as early as desired the first time, however,
the spark will still be correctly slaved to the distributor. The
side effect of this is that the adaptive capacitor will not receive
as much charge time for that cycle and will have a lower
average value the next cycle, thus starting the coil charging
sooner, as can be seen in Figure 18. In this figure, the output
voltage rises before the adaptive capacitor charge signal
occurs.
See Figure 14. In the Stall mode the output is slaved by the
stall capacitor. The stall capacitor can discharge completely,
but starting at point X it charges during the 25% of the engine
cycle (duration of when ZC is logic high = 1). At the same time
a spark from the previous cycle occurs. The DWELL signal
will be high as long as the engine is in stall, but falls gradually
preventing a spark at point Y when the STALL goes low
starting at 2.4V. The coil will be slaved to the stall capacitor,
and at point Z the coil will charge to 6.5 amps as the stall
capacitor charges to 2.0V. At that time the STALL comparator
will trip (STALL = 0) and the DWELL signal will fall, triggering
相關(guān)PDF資料
PDF描述
MCZ33287EG IC DRIVER DUAL LOSIDE MON 20SOIC
MCZ33290EF IC SER LNK INTER ISO KLINE 8SOIC
MCZ33298EG IC SWITCH 8X LOSIDE W/SPI 24SOIC
MCZ33399EF IC LIN INTERFACE W/WAKE 8-SOIC
MCZ33661EFR2 IC LIN INTERFACE PHYSICAL 8-SOIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCZ33094EGR2 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 TFI-4 IGNITION IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel
MCZ33099CEG 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) ALT. VOLT REG 14.6 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
MCZ33099CEGR2 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) ALT. VOLT REG 14.6 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
MCZ33099EG 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) ALT. VOLT REG 14.8 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
MCZ33099EGR2 功能描述:線性穩(wěn)壓器 - 標(biāo)準(zhǔn) ALT. VOLT REG 14.8 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負(fù)載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*