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LTC1842 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1842 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LTC1841/LTC1842/LTC1843 Figure 3a. Power Supply Transient Test Circuit APPLICATIONS INFORMATION 8V V + 5V VREF OUT 2ms/DIV 1841/1843 F03b Figure 3b. Power Supply Transient Rejection Hysteresis Hysteresis can be added to the LTC1842/LTC1843 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. As more hysteresis is added, the upper threshold in- creases the same amount as the low threshold decreases. The maximum voltage allowed between REF and HYST pins is 50mV, producing a maximum hysteresis voltage band of 100mV. The hysteresis band may vary by up to Figure 4. Programmable Hysteresis 15%. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for IREF range are 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. Window Detector The LTC1843 is ideal for use as a micropower window detector as shown in Figure 5. The values of R1, R2 and R3 are selected for a 4.5V undervoltage threshold and a 5.5V overvoltage threshold. R4 and R5 set the hysteresis volt- age. The following design procedure can be used to select the component values: – + – + IN A+ VOTH = 5.5V VUTH = 4.5V R4 2.4M R1 294k R2 62.2k R3 1M 1M R5 10k HYST 3 5V 5 IN B– V – V + VIN LTC1843 2 4 OUT B 1841/43 F05 8 OUT A 1 7 REF 6 Figure 5. Dual Level Detector 6 R2 5 R1 1841/43 F04 2 IREF R1 = VHB (2)(IREF) R2 = IREF 1.182V – () VHB 2 HYST V– REF LTC1843 V + R1 430 Ω R2 10k C1 1 µF 5V TO 8V OUT A OUT A V – 2 7 5V 1 LTC1843 1841/43 F03a IN A+ HYST REF 3 5 6 1M R3 2.4M – + |
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