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LM3668-Q1 датащи(PDF) 9 Page - Texas Instruments |
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LM3668-Q1 датащи(HTML) 9 Page - Texas Instruments |
9 / 24 page P1 P2 N2 + - VIN Load SW1 SW2 LM3668-Q1 www.ti.com SNVSA84A – APRIL 2015 – REVISED MAY 2015 Feature Description (continued) Figure 7. Simplified Circuit for Boost Operation 7.3.3 Internal Synchronous Rectification While in PWM mode, the LM3668-Q1 uses an internal MOSFET as a synchronous rectifier to reduce rectifier forward voltage drop and associated power loss. Synchronous rectification provides a significant improvement in efficiency whenever the output voltage is relatively low compare to the voltage drop across an ordinary rectifier diode. 7.3.4 Current Limit Protection The LM3668-Q1 has current limit protection to prevent excessive stress on itself and external components during overload conditions. The internal current limit comparator will disable the power device at a typical switch peak current limit of 1.85 A (typ.). 7.3.5 Undervoltage Protection The LM3668-Q1 has an UVP comparator to turn the power device off in case the input voltage or battery voltage is too low . The typical UVP threshold is around 2 V. 7.3.6 Short Circuit Protection When the output of the LM3668-Q1 is shorted to GND, the current limit is reduced to about half of the typical current limit value until the short is removed. 7.3.7 Shutdown When the EN pin is pulled low, P1 and P2 are off; N1 and N2 are turned on to pull SW1 and SW2 to ground. 7.3.8 Thermal Shutdown The LM3668-Q1 has an internal thermal shutdown function to protect the die from excessive temperatures. The thermal shutdown trip point is typically 150°C; normal operation resumes when the temperature drops below 125°C. 7.3.9 Start-Up The LM3668-Q1 has a soft-start circuit that smooth the output voltage and ramp current during start-up. During start-up the bandgap reference is slowly ramped up and switch current limit is reduced to half the typical value. Soft start is activated only if EN goes from logic low to logic high after VIN reaches 2.7 V. The start-up time thereby depends on the output capacitor and load current demanded at start-up. It is not recommended to start up the device at full load while in soft-start. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3668-Q1 |
Аналогичный номер детали - LM3668-Q1 |
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Аналогичное описание - LM3668-Q1 |
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