PPC907BE使用數(shù)量,ABB控制模塊
負(fù)真輸出選項(xiàng)導(dǎo)致VMEbus邏輯一個(gè)用于關(guān)閉相應(yīng)的輸出晶體管，其中為用戶(hù)提供開(kāi)路集電極輸出電路，或帶有高壓的電子開(kāi)關(guān)輸入輸出電路。智能輸入/輸出控制器（IIOC）應(yīng)用信息-VMIC的iIOC系列通過(guò)其與的軟件兼容性來(lái)支持本產(chǎn)品VMIVME-2532A，將控制限制為32位數(shù)字輸出或32位數(shù)字輸入電源驅(qū)動(dòng)電路說(shuō)明和應(yīng)用程序白熾燈驅(qū)動(dòng)器-高白熾燈開(kāi)啟/浪涌電流會(huì)破壞半導(dǎo)體燈驅(qū)動(dòng)和導(dǎo)致燈性能差可靠性但是
PPC907BE使用數(shù)量，穩(wěn)定狀態(tài)的單個(gè)燈電流額定值高達(dá)700毫安，可通過(guò)UDN2549B無(wú)需加熱或限流電阻器。當(dāng)白熾燈最初打開(kāi)時(shí)冷燈絲的電阻最小，并且通常允許10到12倍的涌入電流。和UDN2549B，高涌流由內(nèi)部感測(cè)電阻器。負(fù)載電流限制在大約1 A由感應(yīng)輸出電流的分流晶體管提供通過(guò)感應(yīng)電阻器。在這短暫的過(guò)渡期內(nèi)，輸出驅(qū)動(dòng)器以線性方式驅(qū)動(dòng)。作為指示燈加熱后，燈絲電阻增加到最大值價(jià)值然后，輸出驅(qū)動(dòng)器進(jìn)入飽和并應(yīng)用指示燈的全電源電壓。然而，浪涌電流等于或大于1 A將迫使驅(qū)動(dòng)器進(jìn)入反向電流限制。如果這是一個(gè)問(wèn)題，請(qǐng)使用加熱或電流限制燈電路中的電阻器。感應(yīng)負(fù)載驅(qū)動(dòng)器-雙線（單極）步進(jìn)電機(jī)可以直接驅(qū)動(dòng)。內(nèi)部反激二極管通過(guò)抑制產(chǎn)生的高壓尖峰來(lái)防止對(duì)輸出晶體管的損壞關(guān)閉感性負(fù)載故障條件時(shí)（負(fù)載短路或失速電機(jī)）-過(guò)電流保護(hù)已設(shè)計(jì)到UDN2549B，通常發(fā)生在1 A。它保護(hù)設(shè)備來(lái)自電源電壓高達(dá)25 V的輸出短路。當(dāng)達(dá)到最大驅(qū)動(dòng)器輸出電流時(shí)輸出級(jí)線性驅(qū)動(dòng)。如果整體當(dāng)前狀況繼續(xù)，輸出驅(qū)動(dòng)器的熱限制將運(yùn)行，限制驅(qū)動(dòng)器的功耗和連接溫度輸出還包括瞬態(tài)抑制用于感應(yīng)負(fù)載的二極管，如繼電器、螺線管、，和步進(jìn)電機(jī)。在顯示應(yīng)用中，二極管可以用于燈測(cè)試功能。
The negative true output option causes a VMEbus logical
one to turn the corresponding output transistor OFF, which
supplies the user with an open circuit for open-collector
output circuits, or with a high-voltage for electronic switch
type output circuits.
INTELLIGENT I/O CONTROLLER (IIOC)
APPLICATION INFORMATION — VMIC’s line of IIOCs
support this product via its software compatibility with the
VMIVME-2532A which limits the control to 32 bits of
Digital Output or 32 bits of Digital Input. *
POWER DRIVER CIRCUIT DESCRIPTION AND
APPLICATION
INCANDESCENT LAMP DRIVER — High
incandescent lamp turn on/inrush current can destroy
semiconductor lamp drivers and contributes to poor lamp
reliability. However, individual lamps with steady state
current ratings up to 700 mA can be driven with the
UDN2549B without the need for warming or current limiting
resistors.
When an incandescent lamp is initially turned ON, the
cold lamp filament is at minimum resistance and would
normally allow a 10 x to 12 x inrush current. With the
UDN2549B, the high inrush current is sensed by an internal
sense resistor. The load current is limited to approximately
1 A by the shunting transistor sensing the output current
through the sense resistor. During this short transition period,
the output driver is driven in a linear fashion. As the lamp
warms up, the filament resistance increases to its maximum
value. The output driver then goes into saturation and applies
the full supply voltage to the lamp. However, inrush currents
of 1 A or more will force the driver into foldback current
limiting. If this is a problem, use warming or current limiting
resistors in the lamp circuitry.
INDUCTIVE LOAD DRIVER — Bifilar (unipolar)
stepper motors can be driven directly. The internal flyback
diodes prevent damage to the output transistors bysuppressing the high-voltage spikes which are generated
when turning OFF an inductive load FAULT CONDITIONS (Shorted Load or Stalled
Motor) — Overcurrent protection has been designed into the
UDN2549B and typically occurs at 1 A. It protects the device
from output short circuits with supply voltages of up to 25 V.
When the maximum driver output current is reached, the
output stage is driven linearly. If the overall current condition
continues, that output driver’s thermal limiting will operate,
limiting the driver’s power dissipation and junction
temperature. The outputs also include transient suppression
diodes for use with inductive loads such as relays, solenoids,
and stepper motors. In display applications, the diodes can be
used for the lamp test function.
