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LT1640ALCS8 数据表(PDF) 11 Page - Linear Technology |
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LT1640ALCS8 数据表(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT1640AL/LT1640AH Undervoltage and Overvoltage Detection The UV (Pin 3) and OV (Pin 2) pins can be used to detect undervoltage and overvoltage conditions at the power supply input. The UV and OV pins are internally connected to analog comparators with 20mV of hysteresis. When the UV pin falls below its threshold or the OV pin rises above its threshold, the GATE pin is immediately pulled low. The GATE pin will be held low until UV is high and OV is low. The undervoltage and overvoltage trip voltages can be programmed using a three resistor divider as shown in Figure 10a. With R4 = 562k, R5 = 9.09k and R6 = 10k, the undervoltage threshold is set to 37V and the overvoltage threshold is set to 71V. The resistor divider will also amplify the 20mV hysteresis at the UV pin and OV pin to 0.6V and 1.2V at the input, respectively. More hysteresis can be added to the UV threshold by connecting resistor R3 between the UV pin and the GATE pin as shown in Figure 10b. Figure 10a. Undervoltage and Overvoltage Sensing VEE VDD LT1640AL LT1640AH R4 R5 R6 4 1640A F10a OV GND GND 3 2 – 48V UV 8 VUV = 1.223 R4 + R5+ R6 R5 + R6 () VOV = 1.223 R4 + R5+ R6 R6 () (SHORT PIN) VEE VDD LT1640AL /LT1640AH SENSE C1 150nF 25V Q1 IRF530 R6 10 Ω 5% R1 562k 1% R3 1.62M 1% R2 16.9k 1% R4 506k 1% R5 8.87k 1% R1 0.02 Ω 5% 4 2 3 UV = 37.6V UV = 43V GND GND – 48V UV OV 56 8 GATE 1640A F10b OV = 71V (SHORT PIN) * * DIODES INC. SMAT70A 4 3 2 1 Figure 10b. Programmable Hysteresis for Undervoltage Detection APPLICATIO S I FOR ATIO |
类似零件编号 - LT1640ALCS8 |
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类似说明 - LT1640ALCS8 |
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