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LH1525AAB Datasheet(PDF) 7 Page - Infineon Technologies AG |
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LH1525AAB Datasheet(HTML) 7 Page - Infineon Technologies AG |
7 / 7 page 2001 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA LH1525AT/AAB/AABTR www.infineon.com/opto • 1-888-Infineon (1-888-463-4636) 3–113 March 21, 2001-14 Applications Input Control The LH1525 low turn-on current SSR has highly sensitive photo- detection circuits that will detect even the most minute currents flowing through the LED. Leakage current must be considered when designing a circuit to turn on and off these relays. Figure 19 shows a typical logic circuit for providing LED drive current. R1 is the input resistor that limits the amount of current flowing through the LED. For 5.0 V operation, a 2700 Ω resistor will limit the drive current to about 1.4 mA. Where high-speed actuation is desirable, use a lower value resistor for R1. An additional RC peaking circuit is not required with the LH1525 relay. R2 is an optional pull-up resistor which pulls the logic level high ouput (VOH) up toward the VS potential. The pull-up resistance is set at a high value to minimize the overall current drawn from the VS. The primary purpose of this resistor is to keep the differ- ential voltage across the LED below its turn-on threshold. LED dropout voltage is graphed vs. temperature in the Typical Per- formance Characteristics section. When the logic gate is high, leakage current will flow through R2. R2 will draw up to 8 mA before developing a voltage potential which might possibly turn on the LED. Many applications will operate satisfactorily without a pull-up resistor. In the logic circuit in Figure 1 the only path for current to flow is back into the logic gate. Logic leakage is usually negligi- ble. Each application should be evaluated, however, over the full operating temperature range to make sure that leakage cur- rent through the input control LED is kept to a value less than the minimum LED forward current for switch turn-off specification. Figure 22. Input Control Circuit VS ANY TTL OR BUFFERED CMOS LOGIC R1 2700 Ω R2 100 k Ω SSR |
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