Electronic Components Datasheet Search |
|
CMPD2838E-NSA Datasheet(PDF) 9 Page - Texas Instruments |
|
CMPD2838E-NSA Datasheet(HTML) 9 Page - Texas Instruments |
9 / 17 page LM5020 C5 0.01 PF SS R6 12.4k GND GND C8 100 pF RT/ SYNC 10 9 3 U1 GND 6 FB 2 CS 8 100 R7 C11 1000 pF R8 0.47 R9 0.47 GND GND GND OUT 5 UVLO 7 VIN 1 VCC 4 C10 4.7 PF C4 0.1 PF GND GND R1 10 R4 1.00k R2 61.9k C2 2.2 PF GND C1 2.2 PF GND Shutdown C3 0.01 PF GND R3 2.87k GND V+ 1 J1 30-75V IN Q1 Si7898DP GND D1 CMPD2838E Z1 1SMB5936B GND T1 D3 MBRD835L D2 CMPD2838E 20 R13 GND C12 470 pF 10, 1W R10 GND R12 1.47k R11 2.43k 0.1 PF C9 GND OUT RTN 1 2 GND GND 2 J2 +3.3V C13 100 PF GND C14 100 PF GND C15 270 PF GND COMP SYNC Input R5 15.0k C7 3300 pF C6 220 pF LM5020 www.ti.com SNVS275F – MAY 2004 – REVISED APRIL 2006 Soft Start The softstart feature allows the power converter to gradually reach the initial steady state operating point, thereby reducing start-up stresses and current surges. At power on, after the VCC and the line undervoltage lockout thresholds are satisfied, an internal 10µA current source charges an external capacitor connected to the SS pin. The capacitor voltage will ramp up slowly and will limit the COMP pin voltage and the duty cycle of the output pulses. Gate Driver and Maximum Duty Cycle Limit The LM5020 provides an internal gate driver (OUT), which can source and sink a peak current of 1 Amp. The LM5020 is available in two duty cycle limit options. The maximum output duty cycle is typically 80% for the LM5020-1 option and precisely equal to 50% for the LM5020-2 option. The maximum duty cycle function for the LM5020-2 is accomplished with an internal toggle flip-flop which ensures an accurate duty cycle limit. The internal oscillator frequency of the LM5020-2 is therefore twice the operating frequency of the PWM controller (OUT pin). The 80% maximum duty cycle limit of the LM5020-1 is determined by the internal oscillator and varies more than the 50% limit of the LM5020-2. For the LM5020-1 the internal oscillator frequency and the operational frequency of the PWM controller are equal. Thermal Protection Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event the maximum junction temperature is exceeded. This feature prevents catastrophic failures from accidental device overheating. When activated, typically at 165 degrees Celsius, the controller is forced into a low power standby state, disabling the output driver and the bias regulator. After the temperature is reduced (typical hysteresis = 25°C) the VCC regulator is enabled and a softstart sequence initiated. Typical Application Circuit: 36V - 75 VIN and 3.3V, 4.5A OUT Copyright © 2004–2006, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM5020 |
Similar Part No. - CMPD2838E-NSA |
|
Similar Description - CMPD2838E-NSA |
|
|
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 |