Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

Preview PDF HTML

PM6680 Scheda tecnica(PDF) 22 Page - STMicroelectronics

Il numero della parte PM6680
Spiegazioni elettronici  No Rsense dual step-down controller with adjustable voltages for notebook system power
PDF  49 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680 Scheda tecnica(HTML) 22 Page - STMicroelectronics

Back Button PM6680 Datasheet HTML 18Page - STMicroelectronics PM6680 Datasheet HTML 19Page - STMicroelectronics PM6680 Datasheet HTML 20Page - STMicroelectronics PM6680 Datasheet HTML 21Page - STMicroelectronics PM6680 Datasheet HTML 22Page - STMicroelectronics PM6680 Datasheet HTML 23Page - STMicroelectronics PM6680 Datasheet HTML 24Page - STMicroelectronics PM6680 Datasheet HTML 25Page - STMicroelectronics PM6680 Datasheet HTML 26Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 22 / 49 page
background image
Device description
PM6680
22/49
Figure 28.
Constant ON time PWM control
The duty cycle of the buck converter in steady state is:
Equation 2
The PWM control works at a nearly fixed frequency fSW:
Equation 3
As mentioned the steady state switching frequency is theoretically independent from battery
voltage and from output voltage.
Actually the frequency depends on parasitic voltage drops that are present during the
charging path(high side switch resistance, inductor resistance(DCR)) and discharging
path(low side switch resistance, DCR).
As a result the switching frequency increases as a function of the load current.
Standard switching frequency values can be selected for both sections by pin FSEL as
shown in the following table:
Table 6.
FSEL pin selection: typical switching frequency
Fsw@OUT1=1.5V(kHz)
Fsw@OUT2=1.05V(kHz)
FSEL = GND
200
325
FSEL = VREF
290
425
FSEL = LDO5
390
590
D
V
OUT
V
IN
--------------
=
f
SW
V
OUT
V
IN
--------------
K
on
V
OUT
V
IN
--------------
×
-------------------------------
1K
⁄
on
=
=



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 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49


Scheda tecnica Scarica

Go To PDF Page


Link URL



Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   Collegamento alla scheda tecnica    |   scambio Link   |   Ricerca produttore
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