品牌:Numerik | 型号:OL7272LF | 类型:通信IC |
电源电压:4.5V~36V | 频率:4MHZ | 用途:仪器 |
封装:SOP | 功率:1 | 特色服务:没有 |
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1. Overview
The OL7272 is an industrial power line driver and contains four identical short circuit proof differential line
drivers up to 30 Volts driver supply with a joint enable function. At overload there is a thermal shutdown
feature which can be disabled by the user. The high data rate and immunity to cable inductance and
capacitance makes an ideal linedriver.
The very small outline SOP package gives excellent thermal power dissipation, thus the usage in
space limited applications is easy.
2. Applications
OL7272 - Industrial 30 Volt 4 Channel Differential Power Line Driver:
? Industrial encoder interfacing
? Industrial sensor interfacing
? Proximity switches
? Industrial controllers PLC
? Light barriers
3. Features
? Max. voltage range from 4.5 V to 36 V
? Short circuit proof tri-state outputs drive up to 120 mA sink / source
? Operating frequency up to 4 MHz
? Pin compatible with ET7272
? Dynamic peak current up to 1.5 A
? High impedance CMOS / TTL compatible buffered inputs with hysteresis
? Outputs RS 422 A compatible
? Ultra small package TSSOP (OL2068) available
? RoHS conform
4
SIMPLY PRECISE
4. Functional description
The main contents of this new CMOS power line driver are four identical blocks (systems A to D)
with each a CMOS/TTL Schmitt Trigger Input (can be driven at up to VCCD as well) and high power
differential buffered and inverted outputs. With the low active ENABLE pin it is possible to switch off all
eight outputs (high-impedance state), thus this driver can be used in industrial bus systems.
In some rare applications it might be useful to disable the overtemperature shutdown. This can be done
by setting the ENABLE pin to a level between >7,5 V and <12 V. In this case the whole protection of the
IC is disabled! In case of any short circuits or thermal overdrive, the driver might be destroyed!
An internal ultra low drop voltage regulator with typical 5.0 V supplies the internal logic to reduce power
dissipation.
The over-temperature protection block is placed in the center of the chip. The thermal shutdown will be
activated, when an overload condition (i.e. short circuit) has exceeded the over-temperature detection
threshold. In this case automatically all output drivers are switched off. After the chip has cooled down
(a few milliseconds) it automatically re-activates all functions. In case the short circuit is still present, it
switches off again and the same cycle starts from the beginning.
By using this line driver, the field returns of systems, which are accidentally shorted and blown by the
end users, are dramatically reduced.
The OL7272 is pin compatible to a couple of popular other line drivers like 26xx31, ET7272 etc.
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