Electronic Components Datasheet Search |
|
LM5068MM-3 Datasheet(PDF) 11 Page - Texas Instruments |
|
LM5068MM-3 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page CL VDD VEE SENSE TIMER UV GATE OV PWRGD CC CT R3 R2 R1 RS LM5068 Q1 VDD (GND) VEE (-48V) + + + C F RF LM5068 PLUG-IN BOARD CL VDD (GND) VEE (-48V) LIVE BACKPLANE + LM5068 www.ti.com SNVS254C – JANUARY 2004 – REVISED MARCH 2013 FUNCTION DESCRIPTION The LM5068 is designed to facilitate the insertion and removal of circuit cards into live backplanes in a controlled manner. Because the supply bypass capacitors on the circuit card can draw large transient currents, it is critical to control the supply current during insertion to limit system power glitches and connector damage. Controlling in- rush current prevents other boards in the system from resetting during board insertion. Load short-circuit protection is accomplished by active current limiting of the load current. The topology of the LM5068 is illustrated in the simplified application circuit shown in Figure 23. Figure 23. LM5068 Topology Start-Up Operation The LM5068 resides on a removable circuit card. Power is applied to the load or power conversion circuitry through an external N-Channel MOSFET switch and current sense resistor. When power is initially applied to the card, the gate of the external MOSFET is held low. When certain interlock conditions are met, a turn-on sequence begins and an internal 60 µA current source charges the gate of the MOSFET. To initiate the start-up sequence, all of the following interlock conditions must be satisfied: • The input voltage VDD - VEE exceeds 9V(VUVS) • The voltage at UV is above 2.5V (VUV) • The voltage at OV falls below 2.5V (VOV) • The voltage on the Timer capacitor (CT) is less than 1V (VTLVT) • The GATE pin is below 0.5V (VGLT) When all of the interlock conditions are met, a 6 µA TIMER current source is enabled to charge the timer capacitor CT. During this initial timer sequence the GATE output is held low. When the CT capacitor successfully charges up to 4V, the TIMER circuit resets the timer capacitor to 1V and activates a 60 µA current source (IGATE) into the MOSFET gate. Figure 24. Hot Swap Controller Copyright © 2004–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM5068 |
Similar Part No. - LM5068MM-3 |
|
Similar Description - LM5068MM-3 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |