Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

ADP3207A Arkusz danych(PDF) 11 Page - ON Semiconductor

Numer części ADP3207A
Szczegółowy opis  CPU Synchronous Buck Controller
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADP3207A Arkusz danych(HTML) 11 Page - ON Semiconductor

Back Button ADP3207A Datasheet HTML 7Page - ON Semiconductor ADP3207A Datasheet HTML 8Page - ON Semiconductor ADP3207A Datasheet HTML 9Page - ON Semiconductor ADP3207A Datasheet HTML 10Page - ON Semiconductor ADP3207A Datasheet HTML 11Page - ON Semiconductor ADP3207A Datasheet HTML 12Page - ON Semiconductor ADP3207A Datasheet HTML 13Page - ON Semiconductor ADP3207A Datasheet HTML 14Page - ON Semiconductor ADP3207A Datasheet HTML 15Page - ON Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 28 page
background image
ADP3207A
Rev. 1 | Page 11 of 28 | www.onsemi.com
THEORY OF OPERATION
The ADP3207A combines a multimode PWM/RPM (ramp
pulse modulated) control with multiphase logic outputs for
use in 1-, 2-, and 3-phase synchronous buck CPU core supply
power converters. The internal 7-bit VID DAC conforms to
Intel IMVP-6 specifications. Multiphase operation is important
for producing the high currents and low voltages demanded by
today’s microprocessors. Handling high currents in a single-
phase converter puts high thermal stress on the system
components, such as the inductors and MOSFETs.
The multimode control of the ADP3207A ensures a stable high
performance topology for:
Balancing currents and thermals between phases
High speed response at the lowest possible switching
frequency and minimal output decoupling
Minimizing thermal switching losses due to lower
frequency operation
Tight load line regulation and accuracy
High current output by supporting up to 3-phase operation
Reduced output ripple due to multiphase ripple cancellation
High power conversion efficiency both at heavy load and
light load
PC board layout noise immunity
Ease of use and design due to independent component
selection
Flexibility in operation by allowing optimization of design
for low cost or high performance
NUMBER OF PHASES
The number of operational phases and their phase relationship
is determined by internal circuitry that monitors the PWM
outputs. Normally, the ADP3207A operates as a 3-phase controller.
For 2-phase operation, the PWM3 pin is connected to VCC 5 V
programs, and for 1-phase operation, the PWM3 and PWM2
pins are connected to VCC 5 V programs.
When the ADP3207A is initially enabled, the controller sinks
50 μA on the PWM2 and PWM3 pins. An internal comparator
checks the voltage of each pin against a high threshold of 3 V. If
the pin voltage is high due to pull up to the VCC 5 V rail, then
the phase is disabled. The phase detection is made during the
first three clock cycles of the internal oscillator. After phase
detection, the 50 μA current sink is removed. The pins that are
not connected to the VCC 5 V rail function as normal PWM
outputs. The pins that are connected to VCC enter into high
impedance state.
The PWM outputs are 5 V logic-level signals intended for
driving external gate drivers, such as the ADP3419. Because
each phase is monitored independently, operation approaching
100% duty cycle is possible. In addition, more than one output
can operate at a time to allow overlapping phases.
OPERATION MODES
For the ADP3207A, the number of phases can be selected by
the user as described in the Number of Phases section, or they
can dynamically change based on system signals to optimize the
power conversion efficiency at heavy and light CPU loads.
During a VID transient or at a heavy load condition, indicated
by DPRSLP going low and PSI going high, the ADP3207A runs
in full-phase mode. All user-selected phases operate in inter-
leaved PWM mode, which results in minimal VCORE ripple and
best transient performance. While in light load mode, indicated
by either PSI going low or DPRSLP going high, only Phase 1 of
the ADP3207A is in operation to maximize power conversion
efficiency.
In addition to the change of phase number, the ADP3207A
dynamically changes operation modes. In multiphase operation,
the ADP3207A runs in PWM mode, with switching frequency
controlled by the master clock. In single-phase mode based on
the PSI signal, the ADP3207A switches to RPM mode, where
the switching frequency is no longer controlled by the master
clock, but by the ripple voltage appearing on the COMP pin.
The PWM1 pin is set to high each time the COMP pin voltage
rises to a limit determined by the VID voltage and programmed
by the external resistor connected between Pin VRPM and
Pin RRPM. In single-phase mode based on the DPRSLP signal,
the ADP3207A runs in RPM mode, with the synchronous
rectifier (low-side) MOSFETs of Phase 1 being controlled by the
DCM pin to prevent any reverse inductor current. Thus, the
switch frequency varies with the load current, resulting in
maximum power conversion efficiency in deeper sleep mode of
CPU operation. In addition, during any VID transient, system
transient (entry/exit of deeper sleep), or current limit, the
ADP3207A goes into full phase mode, regardless of DPRSLP
and PSI signals, eliminating current stress to Phase 1.
Table 4 summarizes how the ADP3207A dynamically changes
phase number and operation modes based on system signals
and operating conditions.


Podobny numer części - ADP3207A

ProducentNumer częściArkusz danychSzczegółowy opis
logo
ON Semiconductor
ADP3207 ONSEMI-ADP3207 Datasheet
398Kb / 29P
   CPU Synchronous Buck Controller
February 2008 ??Rev. 1
ADP3207C ONSEMI-ADP3207C Datasheet
531Kb / 32P
   7-Bit Programmable, Multi-Phase Mobile, CPU Synchronous Buck Controller
December, 2009 ??Rev. 0
ADP3207CFJCPZ-RL ONSEMI-ADP3207CFJCPZ-RL Datasheet
531Kb / 32P
   7-Bit Programmable, Multi-Phase Mobile, CPU Synchronous Buck Controller
December, 2009 ??Rev. 0
ADP3207CJCPZ-RL ONSEMI-ADP3207CJCPZ-RL Datasheet
531Kb / 32P
   7-Bit Programmable, Multi-Phase Mobile, CPU Synchronous Buck Controller
December, 2009 ??Rev. 0
ADP3207D ONSEMI-ADP3207D Datasheet
494Kb / 32P
   7-Bit Programmable, Multi-Phase Mobile, CPU Synchronous Buck
December, 2009 ??Rev. 0
More results

Podobny opis - ADP3207A

ProducentNumer częściArkusz danychSzczegółowy opis
logo
ON Semiconductor
ADP3207 ONSEMI-ADP3207 Datasheet
398Kb / 29P
   CPU Synchronous Buck Controller
February 2008 ??Rev. 1
logo
Cherry Semiconductor Co...
CS5157 CHERRY-CS5157 Datasheet
316Kb / 14P
   CPU 5-Bit Synchronous Buck Controller
logo
ON Semiconductor
CS5161 ONSEMI-CS5161 Datasheet
589Kb / 18P
   CPU 5?묪it Synchronous Buck Controller
July, 2006 ??Rev. 12
CS5165H ONSEMI-CS5165H Datasheet
722Kb / 21P
   5?묪it Synchronous CPU Buck Controller
July, 2006 ??Rev. 5
logo
Cherry Semiconductor Co...
CS5150 CHERRY-CS5150 Datasheet
236Kb / 14P
   CPU 4-Bit Synchronous Buck Controller
CS5155H CHERRY-CS5155H Datasheet
238Kb / 14P
   CPU 5-Bit Synchronous Buck Controller
CS5150H CHERRY-CS5150H Datasheet
322Kb / 14P
   CPU 4-Bit Synchronous Buck Controller
logo
ON Semiconductor
CS5150 ONSEMI-CS5150 Datasheet
631Kb / 18P
   CPU 4?묪it Synchronous Buck Controller
July, 2006 ??Rev. 5
CS5157H ONSEMI-CS5157H Datasheet
432Kb / 16P
   CPU 5?묪it Synchronous Buck Controller
October, 2005 ??Rev. 7
CS5155H ONSEMI-CS5155H Datasheet
623Kb / 17P
   CPU 5?묪it Synchronous Buck Controller
July, 2006 ??Rev. 3
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 27 28


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
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