データシートサーチシステム |
|
LM2640 データシート(PDF) 2 Page - Texas Instruments |
|
LM2640 データシート(HTML) 2 Page - Texas Instruments |
2 / 29 page LM2640 SNVS019B – DECEMBER 1998 – REVISED APRIL 2013 www.ti.com Connection Diagram Figure 1. 28-Lead TSSOP (PW) Package Top View See Package Number PW0028A Pin Description(1) Pin # Name Function 1 CSH2 The sense point for the positive side of the voltage across the current sense resistor (R13) placed in series with output #2. 2 FB2 The regulated output voltage appearing at output #2 is sensed using this pin by connecting it to the center of the output resistive divider (R15 and R16). 3 COMP2 An R-C network made up of R11, C10, and C12 is connected to this pin which provides loop compensation for regulated output #2. 4 SS2 This provides programmable soft-start for the #2 output along with capacitor C15. 5 ON/OFF2 This pin turns off only output #2. 6 SD The part can be put into “sleep” mode using this pin, where both outputs are off and the internal chip functions are shut down. 7 SYNC The internal oscillator may be synchronized to an external clock via this pin. 8 GND Connect this pin to circuit Signal Ground. 9 REF Internal 2.5V reference voltage. This voltage is turned off by the SD pin, but remains on if either or both ON/OFF pins are pulled low, which turns off the regulated output(s). 10 2NDFB/FPWM A 12V supply can be generated using an auxiliary winding on the 5V output inductor. Feedback to control this 12V output is brought in through this pin. If the 12V supply is not required, this pin can also force the chip to operate at fixed frequency at light loads by pulling the pin low (this is the “forced-PWM” mode of operation). This will prevent the converter from operating in pulse-skipping mode. 11 ON/OFF1 This pin turns off only output #1. 12 SS1 This provides programmable soft-start for the #1 output along with capacitor C3. 13 COMP1 An R-C network made up of R6, C5, and C7 is connected to this pin which provides loop compensation for regulated output #1. 14 FB1 The regulated output voltage appearing at output #1 is sensed using this pin by connecting it to the center of the output resistive divider (R1 and R2). 15 CSH1 The sense point for the positive side of the voltage across the current sense resistor (R4) placed in series with output #1. 16 HDRV1 The drive for the gate of the high-side switching FET used for output #1. 17 SW1 This is the switching output drive point of the two power FETs which produce output #1. 18 CBOOT1 The bootstrap capacitor (C8) for output #1 is returned to this point. 19 LDRV1 The drive for the gate of the low-side switching FET (synchronous rectifier) used for output #1. 20 PGND Connect this pin to circuit Power Ground. (1) (Refer to Typical Application Circuits) 2 Submit Documentation Feedback Copyright © 1998–2013, Texas Instruments Incorporated Product Folder Links: LM2640 |
同様の部品番号 - LM2640_15 |
|
同様の説明 - LM2640_15 |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト 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 |