PPC907BE使用数量,ABB控制模块
负真输出选项导致VMEbus逻辑一个用于关闭相应的输出晶体管，其中为用户提供开路集电极输出电路，或带有高压的电子开关输入输出电路。智能输入/输出控制器（IIOC）应用信息-VMIC的iIOC系列通过其与的软件兼容性来支持本产品VMIVME-2532A，将控制限制为32位数字输出或32位数字输入电源驱动电路说明和应用程序白炽灯驱动器-高白炽灯开启/浪涌电流会破坏半导体灯驱动和导致灯性能差可靠性但是
PPC907BE使用数量，稳定状态的单个灯电流额定值高达700毫安，可通过UDN2549B无需加热或限流电阻器。当白炽灯最初打开时冷灯丝的电阻最小，并且通常允许10到12倍的涌入电流。和UDN2549B，高涌流由内部感测电阻器。负载电流限制在大约1 A由感应输出电流的分流晶体管提供通过感应电阻器。在这短暂的过渡期内，输出驱动器以线性方式驱动。作为指示灯加热后，灯丝电阻增加到最大值价值然后，输出驱动器进入饱和并应用指示灯的全电源电压。然而，浪涌电流等于或大于1 A将迫使驱动器进入反向电流限制。如果这是一个问题，请使用加热或电流限制灯电路中的电阻器。感应负载驱动器-双线（单极）步进电机可以直接驱动。内部反激二极管通过抑制产生的高压尖峰来防止对输出晶体管的损坏关闭感性负载故障条件时（负载短路或失速电机）-过电流保护已设计到UDN2549B，通常发生在1 A。它保护设备来自电源电压高达25 V的输出短路。当达到最大驱动器输出电流时输出级线性驱动。如果整体当前状况继续，输出驱动器的热限制将运行，限制驱动器的功耗和连接温度输出还包括瞬态抑制用于感应负载的二极管，如继电器、螺线管、，和步进电机。在显示应用中，二极管可以用于灯测试功能。
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.
