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TPS40210-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS40210-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 47 page + + Soft Start and Overcurrent 5 FB 4 COMP 3 DIS/EN 700 mV LDO PWM Logic 2 SS 1 RC Oscillator and Slope Compensation UVLO Driver 9 BP 10 VDD 8 GDRV 6 GND 7 ISNS + Gain = 6 + 150 mV LEB OC Fault OC Fault UDG-07107 Enable E/A E/A SS Ref TPS40210-Q1, TPS40211-Q1 www.ti.com SLVS861E – AUGUST 2008 – REVISED DECEMBER 2014 7 Detailed Description 7.1 Overview The TPS40210-Q1 and TPS40211-Q1 devices are wide-input voltage non-sync boost controllers. These devices can be used in various topologies such as boost, flyback, SEPIC, and various LED driver applications because of its grounded source N-channel FET. The device also features programmable soft start, overcurrent protection, and programmable oscillator frequency. Current mode control provides improved transient response and simplified loop compensation. The TPS40210-Q1 and TPS40211-Q1 devices differ in the reference voltage to which the error amplifier regulates the FB pin. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Minimum On-Time and Off-Time Considerations The TPS40210-Q1 device has a minimum off time of approximately 200 ns and a minimum on time of 300 ns. These two constraints place limitations on the operating frequency that can be used for a given input-to-output conversion ratio. See Figure 2 for the maximum frequency that can be used for a given duty cycle. The duty cycle at which the converter operates is dependent on the mode in which the converter is running. If the converter is running in discontinuous-conduction mode, the duty cycle varies with changes to the load much more than it does when running in continuous-conduction mode. In continuous-conduction mode, the duty cycle is related primarily to the input and output voltages. Copyright © 2008–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS40210-Q1 TPS40211-Q1 |
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