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BD6164GUT
BD6164GUT

... voltage is too low. During boost up, the system is not able to accurately detect the battery voltage (no separate VBAT pin on the chip), so the UVLO is disabled. In case of an under voltage situation, there is no need to set an interrupt register. 7. The DCDC mode. ...
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... interruptions for smaller, less critical, stand-alone applications. They are ideal for computers and workstations that can tolerate the 2 – 4 milliseconds of transfer time when the UPS switches from AC input to battery power. SolaHD has UPS systems that protect your equipment from all power disturba ...
Short Circuit Current Calculations
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... can be characterized as all 3-phases “bolted” together to create a zero impedance connection. This establishes a “worst case” (highest current) condition that results in maximum three phase thermal and mechanical stress in the system. From this calculation, other types of fault conditions can be app ...
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a Dual-Loop 50 Mbps–2.7 Gbps Laser Diode Driver ADN2841
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(t) i - inst.eecs.berkeley.edu
(t) i - inst.eecs.berkeley.edu

< 1 ... 503 504 505 506 507 508 509 510 511 ... 2207 >

Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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