Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

L6996D Datasheet(PDF) 10 Page - STMicroelectronics

Part # L6996D
Description  DINAMICALLY PROGRAMMABLE SYNCHRONOUS STEP DOWN CONTROLLER FOR MOBILE CPUs
Download  26 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6996D Datasheet(HTML) 10 Page - STMicroelectronics

Back Button L6996D Datasheet HTML 6Page - STMicroelectronics L6996D Datasheet HTML 7Page - STMicroelectronics L6996D Datasheet HTML 8Page - STMicroelectronics L6996D Datasheet HTML 9Page - STMicroelectronics L6996D Datasheet HTML 10Page - STMicroelectronics L6996D Datasheet HTML 11Page - STMicroelectronics L6996D Datasheet HTML 12Page - STMicroelectronics L6996D Datasheet HTML 13Page - STMicroelectronics L6996D Datasheet HTML 14Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 26 page
background image
L6996
10/26
1
DEVICE DESCRIPTION
1.1 Constant On Time PWM Topology
Figure 12. Loop block schematic diagram
This device implements a Constant On Time control, where the Ton is the on time duration forced by a one-shot
circuit. The controller calculates the one-shot time directly proportional to the VCS- pin voltage and inversely to
the OSC pin voltage as in Eq 1:
Eq 1
where KOSC=180ns and τ is the internal propagation delay time (Typ. 40ns). The system imposes in steady
state a minimum on time corresponding to VOSC = 2V. In fact if the VOSC voltage increases above 2V the cor-
responding Ton will not decrease. Connecting OSC pin to a voltage partition from VIN to GND, it allows steady-
state switching frequency FSW independent of VIN. It results:
Eq 2
where
Eq 3
The above equations allow setting the frequency divider ratio aOSC once output voltage has been set; note that
such equations hold only if VOSC<2.A minimum off-time constrain of about 500nS is introduced in order to as-
sure the boot capacitor charge and to limit switching frequency after a load transient as well as to mask PWM
comparator output against switching noise and spikes.
The system has not an internal clock, because this is a hysteretic controller, so the turn on pulse will start if three
Q
Vprog
LS
HS
VFB+
DS
CS-
VID0-4
Rsense
R1
R
S
Vout
Vin
HGATE
LGATE
Q
R2
PWM comparator
VFB-
FFSR
One-shot generator
OSC
-
+
+
-
DAC
T
ON
K
OSC
V
CS-
V
OS C
---------------
τ
+
=
F
SW
V
OUT
V
IN
---------------
1
T
ON
-----------
⋅α
OSC
F
SW
K
OSC
==
α
OSC
V
OS C
V
IN
---------------
R
2
R
2
R
1
+
--------------------
==


Similar Part No. - L6996D

ManufacturerPart #DatasheetDescription
logo
STMicroelectronics
L6995 STMICROELECTRONICS-L6995 Datasheet
336Kb / 25P
   STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION
L6995D STMICROELECTRONICS-L6995D Datasheet
336Kb / 25P
   STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION
L6995DTR STMICROELECTRONICS-L6995DTR Datasheet
336Kb / 25P
   STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION
L6995S STMICROELECTRONICS-L6995S Datasheet
478Kb / 26P
   LOSSLESS CURRENT LIMIT
April 2004 REV. 1
L6995STR STMICROELECTRONICS-L6995STR Datasheet
478Kb / 26P
   LOSSLESS CURRENT LIMIT
April 2004 REV. 1
More results

Similar Description - L6996D

ManufacturerPart #DatasheetDescription
logo
Maxim Integrated Produc...
MAX1717 MAXIM-MAX1717 Datasheet
501Kb / 32P
   Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs
19-1636; Rev 0; 1/00
logo
Vishay Siliconix
SIP12202 VISHAY-SIP12202 Datasheet
768Kb / 10P
   Synchronous Step Down Controller
Rev. A, 10-Oct-05
SIP12201 VISHAY-SIP12201 Datasheet
865Kb / 11P
   Synchronous Step Down Controller
Rev. A, 10-Oct-05
logo
STMicroelectronics
L6911E STMICROELECTRONICS-L6911E Datasheet
152Kb / 20P
   5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
L6911D STMICROELECTRONICS-L6911D Datasheet
233Kb / 17P
   5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
L6911E STMICROELECTRONICS-L6911E_07 Datasheet
482Kb / 34P
   5-Bit programmable step down controller with synchronous rectification
L6911C STMICROELECTRONICS-L6911C Datasheet
351Kb / 20P
   5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
logo
ON Semiconductor
NCP5212A ONSEMI-NCP5212A Datasheet
336Kb / 19P
   Single Synchronous Step-Down Controller
May, 2009 ??Rev. 0
logo
Intersil Corporation
ISL8117 INTERSIL-ISL8117 Datasheet
918Kb / 23P
   Synchronous Step-down PWM Controller
June 4, 2015
logo
Texas Instruments
TPS53114PWR TI-TPS53114PWR Datasheet
954Kb / 27P
[Old version datasheet]   SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26


Datasheet Download

Go To PDF Page


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


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
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