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参数资料
| 型号： | L484 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDIP16 |
| 封装： | DIP-16 |
| 文件页数： | 5/11页 |
| 文件大小： | 454K |
| 代理商： | L484 |
Obsolete
Product(s)
- Obsolete
Product(s)
PIN FUNCTIONS (refer to fig. 2)
N
°
Name
Function
1
CURRENT SENSING
INPUT
Connection for Coil Current Limitation. The current is measured on the
sense resistor RSENS and divided on R1/R2. The current limitation value is
given by :
ISENS
=
R1
+ R2
RSENS R2
2
PICKUP INPUT
Magnetic Pickup Signal Input. This pin sets the dwell time,
i.e. the max
negative pickup voltage value starting from which the device can drive the
current into the coil. The real dwell time will be a function of the dwell
control logic. Increasing the resistor R11 the maximum conduction time
increases. The max input current foreseen is 2mA.
3
PERMANENT
CONDUCT.
PROTECTION TIMER
A capacitor C1 connected between this pin and ground sets the delay of the
permanent conduction protection in the coil current. Using a 50nF capacitor
the typical desaturation time delay for the protection is 75ms.
4
PERMANENT CONDUCT.
PROTECTION INHIBIT
A low level on this input (max 0.7V) disables the protection, irrespective of
the state of pin 3. If the protection is used this pin must be left open.
5
RPM OUTPUT
Open collector output signal which is at a low level when the final darlington
is in ON status. The current is internally limited at 10mA.
6
DWELL TIME ADJUST
At high motor rotation speeds,
i.e. when the peak value of the magnetic
pick-up signal exceedes 6V using R12 = 100K
, this pin may be used to
vary the dwell ratio. Adding a resistor in series Ra between this pin and pin
11 the desaturation time is reduced. It is therefore possible to use this pin to
adapt the L484 to various pickup types. The maximum value of the resistor
Ra is 200K
.
7
DWELL CONTROL
TIMER
A capacitor C2 connected between this pin and ground sets the timing for
the dwell control. The recommended value is 100nF. The resistors Rb/Rc
provide an hysteresis to confirm ON state and avoid spurious sparks.
8
ZERO CROSSING
INPUT
Zero cross detector input of the magnetic pickup signal for the ignition
actuation. At high motor rotation speeds, the external resistor R12 may be
used to vary the
desaturation time ratio,
to adapt the L484 to various
signal waveforms of time magnetic pick-up. Reducing the resistor value the
dwell time increases. Typically the range of values for resistor R12 is from
50K
to 150K..
9
POWER-ON INPUT
A low level on this pin forces the external darlington into conduction
particularly useful in anti knock system. This function is particularly useful in
antiknock system because provides a spark time delay. Anyway the current
limitation,
the permanent conduction protection and the dump protection
are operating even when pin 9 is at a low level. If this function is not used it
must be left open.
10
SIGNAL GROUND
This pin must be connected to ground.
11
POWER SUPPLY
Supply Voltage Input. A 7V (typ) zener is present at the input. The external
resistor R9 limits the current through the zener for higher supply voltages.
12
DUMP PROTECTION
The device is protected against the load dump. In load dump condition an
internal circuit,
based on a zener diode and a darlington transistor,
switches off the external darlington and short circuits the supply.
By means of the external divider R8/R9 the protection threshold can be
changed and is given as first approximation by:
VDth
= 8.5
R8
+ R9
R9
+ 5 104 R8
(the resistor R9 value must be higher than 4K
).
* this function is particularly useful in antiknock systeme because provides a spark time delay. anyway the current limitation, the pemanent con
duction protection and the dump protection are operating even when pin 9 is at a low level.
L484
3/11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L484D1 | 功能描述:马达/运动/点火控制器和驱动器 Magnetic Control RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| L484D1013TR | 功能描述:马达/运动/点火控制器和驱动器 Magnetic Control RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| L485 | 制造商:LAUREL ELECTRONICS 功能描述:Modbus RS485, dual RJ11, communications plug-in board Laureate meters and counters. ;RoHS Compliant: Yes |
| L486 | 制造商:IXYS 制造商全称:IXYS Corporation 功能描述:IGBT Modules Sixpack, H Bridge |
| L4863 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:DUAL 2.2W AUDIO AMPLIFIER PLUS STEREO HEADPHONE FUNCTION |
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