Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

Preview PDF HTML

PM6680ATR Datasheet(PDF) 19 Page - STMicroelectronics

No. de pieza PM6680ATR
Descripción Electrónicos  Dual synchronous step-down controller with adjustable output voltages plus LDO
PDF  48 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680ATR Datasheet(HTML) 19 Page - STMicroelectronics

Back Button PM6680ATR Datasheet HTML 15Page - STMicroelectronics PM6680ATR Datasheet HTML 16Page - STMicroelectronics PM6680ATR Datasheet HTML 17Page - STMicroelectronics PM6680ATR Datasheet HTML 18Page - STMicroelectronics PM6680ATR Datasheet HTML 19Page - STMicroelectronics PM6680ATR Datasheet HTML 20Page - STMicroelectronics PM6680ATR Datasheet HTML 21Page - STMicroelectronics PM6680ATR Datasheet HTML 22Page - STMicroelectronics PM6680ATR Datasheet HTML 23Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 19 / 48 page
background image
PM6680A
Device description
19/48
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 input
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 = 3.3 V (kHz)
Fsw@OUT2 = 1.8 V (kHz)
FSEL = GND
195
335
FSEL = VREF
295
440
FSEL = LDO5
390
600
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


Datasheet Descarga

Go To PDF Page


Enlace URL



¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Enlace a la hoja de datos    |   Intercambio de Enlaces   |   Lista de Fabricantes
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