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LTC1441CN8 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1441CN8 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LTC1440/LTC1441/LTC1442 144012fc APPLICATIONS INFORMATION V + R1 430 Ω R2 10k C1 1 µF 5V TO 8V OUT V – 21 7 8 GND LTC1440 1440/1/2 F03a IN+ IN– HYST REF 3 4 5 6 R3 2.4M – + Figure 3a. Reference Transient Response Test Circuit 2ms/DIV 1440/1/2 F03b 8V V + 5V VREF OUT Hysteresis Hysteresis can be added to the LTC1440 by connecting a resistor (R1) between the REF and HYST pins and a second resistor (R2) from HYST to V – (Figure 4). The difference between the upper and lower threshold voltages, or hysteresis voltage band (VHB), is equal to twice the voltage difference between the REF and HYST pins. When more hysteresis is added, the upper threshold increases the same amount as the low threshold de- creases. The maximum voltage allowed between REF and HYST pins is 50mV, producing a maximum hysteresis voltage band of 100mV. The hysteresis band could vary by up to 15%. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for IREF range from 0.1 µA to 5µA. If 2.4M is chosen for R2, then the value of R1 is equal to the value of VHB. Figure 5. Glitch-Free Level Detector with Hysteresis V + R5 430 Ω 5% R3 15k 1% C1 1 µF OUT V – 21 7 5V VIN 8 GND LTC1440 1440/1/2 F05 IN+ IN– HYST REF 3 4 5 6 – + R2 3.4M 1% R1 1.18M 1% R4 2.4M 1% 6 R2 HYST V– REF 5 R1 1440/1/2 F04 LTC1440 2 IREF R1 = VHB (2)(IREF) R2 = IREF 1.182V – ( ) VHB 2 Figure 4. Programmable Hysteresis Level Detector The LTC1440 is ideal for use as a micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from VIN to the noninverting comparator input. R3 and R4 set the hysteresis voltage, and R5 and C1 bypass the reference output. The following design procedure can be used to select the component values: 1. Choose the VIN voltage trip level, in this example 4.65V. Figure 3b. Reference and Comparator Output Transient Response |
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