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tidu271

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2 2 1 1 1 2 1 2 2 2 1 1 Power Supply Design and Isolation www.ti.com C69 0.1µF C60 AVDD_ISO 5.3 V TC_N TC_P TC_N TC_P

www.ti.com NOTE: Power Supply Design and Isolation The current sense resistor (R16) must be placed near to LM5069 and connected using the Kelvin Connection as shown in Figure 54. Figure 54. Kelvin Sense Connection for Sense Resistor UVLO and OVLO V IN TP1 R1 3 UVLO R2 R3 4 OVLO LM5069 Figure 55. UVLO & OVLO Using External Resistors Choose the upper and lower UVLO thresholds: VUVH VUVL 1.5 V R1 71.5 K 21A 21A 2.5 V R1 2.5 V 71.5 K R4 14.7 K VUVL 2.5 V 14.66 V 2.5 V Therefore, V UVH = 16.1 V and V UVL = 14.66 V with hysteresis of 1.5 V that keeps the device from responding to power-on glitches during start up. Choose the upper and lower OVLO thresholds: VOVH VOVL 2 V R2 95.3 K 21A 21A 2.5 V R2 2.5 V 95.3 K R3 7.5 K VOVL 2.5 V 34.27 V 2.5 V Therefore, V OVH = 34.27 V and V OVL = 31.77 V with hysteresis of 2 V. (39) (40) (41) (42) TIDU271–May 2014 Submit Documentation Feedback Temperature Sensor Interface Module for Programmable Logic Controllers (PLC) Copyright © 2014, Texas Instruments Incorporated 43