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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： | 8/11页 |
| 文件大小： | 454K |
| 代理商： | L484 |
Obsolete
Product(s)
- Obsolete
Product(s)
DARLINGTON OVERVOLTAGE LIMITATION
The darlington is protected against overvoltage by
means of an external divider R5 /R6 (pin 15) and an
internal zener. This zener drives the external dar-
lington in order to limit the collector voltage.
CHARGING ANGLE SIGNAL OUTPUT
This signal is intended for tachometer applications
(pin 5). It consists of an open collector stage with
current internally limited at 10mA
"POWER ON" SIGNAL INPUT
In the low status this input forces the external dar-
lington into conduction (pin 9). This control input can
be used together with the conduction time informa-
tion coming from pin 5 to bypass the normal dwell
time calculation. When an external logic control is
used to recognize particular engine condition (as in
anti Knock system).
PROTECTION CIRCUITS
PERMANENT CONDUCTION PROTECTION
This function is intended to prevent continuous cur-
rent conduction in the final stage when the magnetic
pickup is open or intermittent. The duration of the in-
tervention is set by means of a capacitor 1 at pin 3.
Grounding pins 3 or 4, this protection is eliminated.
The inhibit function at pin 4 is particularly useful
when an external logic control is used to disable the
permanent conduction protection.
REVERSE BATTERY AND DUMP PROTECTION
Due to the external resistors R6, R7, R8, R10 the de-
vice is protected against reverse battery. The load
dump protection withstands up to 100V with a decay
time
≤ 300ms. The intervention threshold for load
dump is fixed by means of an external divider con-
nected to pin 11.
OTHER APPLICATION INFORMATION
If the supply is voltage disconnected - or the battery
wire is broken - while the current is flowing through
the coil, the external diode D1 keeps the coil current
from recirculating into the device : in this way both
device and darlington are protected.
The zener diode Dz, connected between pin 14 and
GND, allows to withstand positive spikes up to 200V.
The device - used in the recommended application
circuit - satisfies the ISO/DP 7637/1 overvoltage
standard.
Figure 1 : Typical Magnetic Pick–up Waveform and L484 Response at low and high
fequency.
L484
6/11
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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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