Electronic Components Datasheet Search |
|
HPA00314DGSR Datasheet(PDF) 9 Page - Texas Instruments |
|
HPA00314DGSR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 30 page FB PG VIN 8 LBO GND SYNC EN LBI PGND TPS62051 SW 1 6 7 3 2 9 5 4 10 R3 R4 R1 R2 R5 R6 R7 1 Cell Li-lon Ci = 10 µF L1 = 10 µH VO = 2.5 V / 600 mA Co = 22 µF C(ff) = 6.8 pF LBI ENABLE LBO VIN Bandgap LBI Comparator Enable to Internal Circuitry TPS62050, TPS62051, TPS62052, TPS62054, TPS62056 www.ti.com SLVS432F – SEPTEMBER 2002 – REVISED JUNE 2015 Feature Description (continued) 9.3.3 ENABLE / Low-Battery Detector (Enhanced Version) TPS62051 Only The TPS62051 device offers an enhanced LBI functionality to provide a precise, user-programmable undervoltage shutdown. No additional supply voltage supervisor (SVS) is needed to provide this function. When the enable (EN) pin is pulled high, only the internal bandgap voltage reference is switched on to provide a reference source for the LBI comparator. As long as the voltage at LBI is less than the LBI trip point, all other internal circuits are shut down, reducing the supply current to 5 µA. As soon as input voltage at LBI rises above the LBI trip point of 1.21 V, the device is completely enabled and starts switching. Figure 4. Block Diagram of ENABLE / LBI Functionality for TPS62051 The logic level of the LBO pin is not defined for the first 500 µs after EN is pulled high. When the enhanced LBI is used to supervise the battery voltage and shut down the TPS62051 at low input voltages, the battery voltage rises again when the current drops to zero. The implemented hysteresis on the LBI pin may not be sufficient for all types of batteries. Figure 5 shows how an additional external hysteresis can be implemented. Figure 5. Enhanced LBI With Increased Hysteresis A MATHCAD® file to calculate R7 can be downloaded from the product folder on the TI web. 9.3.4 Undervoltage Lockout The undervoltage lockout (UVLO) circuit prevents the device from misoperation at low input voltages. The circuit prevents the converter from turning on the switch or rectifier MOSFET under undefined conditions. Copyright © 2002–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS62050 TPS62051 TPS62052 TPS62054 TPS62056 |
Similar Part No. - HPA00314DGSR |
|
Similar Description - HPA00314DGSR |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |