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LM5181-Q1 데이터시트(PDF) 15 Page - Texas Instruments |
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LM5181-Q1 데이터시트(HTML) 15 Page - Texas Instruments |
15 / 33 page K ˜ § · ¨ ¸ © ¹ SW-PEAK OUT(max) OUT IN PS I I 2 V 1 V N 15 LM5181-Q1 www.ti.com SNVSBN6 – APRIL 2020 Product Folder Links: LM5181-Q1 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated Feature Description (continued) (13) A failsafe current limit set at 1.2 A, or 1.6 times the nominal peak current limit, provides redundant fault protection in case of transformer short circuit or saturation effects. This initiates a 7.5-ms hiccup interval after eight overcurrent events. 8.3.10 Thermal Shutdown Thermal shutdown is an integrated self-protection to limit junction temperature and prevent damage related to overheating. Thermal shutdown turns off the device when the junction temperature exceeds 175°C to prevent further power dissipation and temperature rise. Junction temperature decreases after shutdown, and the LM5181-Q1 restarts when the junction temperature falls to 169°C. 8.4 Device Functional Modes 8.4.1 Shutdown Mode EN/UVLO facilitates ON and OFF control for the LM5181-Q1. When VEN/UVLO is below approximately 0.6 V, the device is in shutdown mode. Both the internal LDO and the switching regulator are off. The quiescent current in shutdown mode drops to 3 μA at VIN = 24 V. The LM5181-Q1 also employs internal bias rail undervoltage protection. If the internal bias supply voltage is below its UV threshold, the converter remains off. 8.4.2 Standby Mode The internal bias rail LDO regulator has a lower enable threshold than the converter itself. When VEN/UVLO is above 0.6 V and below the precision-enable threshold (1.5 V typically), the internal LDO is on and regulating. The precision enable circuitry is turned on once the internal VCC is above its UV threshold. The switching action and voltage regulation are not enabled until VEN/UVLO rises above the precision enable threshold. 8.4.3 Active Mode The LM5181-Q1 is in active mode when VEN/UVLO is above the precision-enable threshold and the internal bias rail is above its UV threshold. The LM5181-Q1 operates in one of three modes depending on the load current requirement: 1. Boundary conduction mode (BCM) at heavy loads 2. Discontinuous conduction mode (DCM) at medium loads 3. Frequency foldback mode (FFM) at light loads Refer to the PSR Flyback Modes of Operation section for more details. |
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