Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼

Delete All
ON OFF
ALLDATASHEET.ES

X  

Preview PDF Download HTML

BD9130EFJ Datasheet(PDF) 6 Page - Rohm

No. de Pieza. BD9130EFJ
Descripción  Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET
Descarga  15 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo 

BD9130EFJ Datasheet(HTML) 6 Page - Rohm

Zoom Inzoom in Zoom Outzoom out
 6 / 15 page
background image
BD9130EFJ
Technical Note
6/14
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Operation
BD9130EFJ is a synchronous rectifying step-down switching regulator that achieves faster transient response by employing
current mode PWM control system. It utilizes switching operation in PWM (Pulse Width Modulation) mode for heavier load,
while it utilizes SLLM
TM (Simple Light Load Mode) operation for lighter load to improve efficiency.
Synchronous rectifier
It does not require the power to be dissipated by a rectifier externally connected to a conventional DC/DC converter IC,
and its P.N junction shoot-through protection circuit limits the shoot-through current during operation, by which the power
dissipation of the set is reduced.
Current mode PWM control
Synthesizes a PWM control signal with a inductor current feedback loop added to the voltage feedback.
PWM (Pulse Width Modulation) control
The oscillation frequency for PWM is 1 MHz. SET signal form OSC turns ON a P-channel MOS FET (while a
N-channel MOS FET is turned OFF), and an inductor current IL increases. The current comparator (Current Comp)
receives two signals, a current feedback control signal (SENSE: Voltage converted from IL) and a voltage feedback
control signal (FB), and issues a RESET signal if both input signals are identical to each other, and turns OFF the
P-channel MOS FET (while a N-channel MOS FET is turned ON) for the rest of the fixed period. The PWM control
repeat this operation.
SLLM
TM (Simple Light Load Mode) control
When the control mode is shifted from PWM for heavier load to the one for lighter load or vise versa, the switching pulse
is designed to turn OFF with the device held operated in normal PWM control loop, which allows linear operation without
voltage drop or deterioration in transient response during the mode switching from light load to heavy load or vise versa.
Although the PWM control loop continues to operate with a SET signal from OSC and a RESET signal from Current
Comp, it is so designed that the RESET signal is held issued if shifted to the light load mode, with which the switching is
tuned OFF and the switching pulses are thinned out under control. Activating the switching intermittently reduces the
switching dissipation and improves the efficiency.
Fig.21 Diagram of current mode PWM control
Fig.22 PWM switching timing chart
Fig.23 SLLM
TM switching timing chart
OSC
Level
Shift
Driver
Logic
RQ
S
IL
SW
ITH
Current
Comp
Gm Amp.
SET
RESET
FB
Load
SENSE
VOUT
VOUT
Current
Comp
SET
RESET
SW
VOUT
PVCC
GND
GND
GND
IL(AVE)
VOUT(AVE)
SENSE
FB
Current
Comp
SET
RESET
SW
VOUT
PVCC
GND
GND
GND
0A
VOUT(AVE)
SENSE
FB
IL
Not switching
IL


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15 


Datasheet Download




Enlace URL




Privacy Policy
ALLDATASHEET.ES
Does ALLDATASHEET help your business so far?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   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