|
|
PDF RT9247 Data sheet ( Hoja de datos )
| Número de pieza | RT9247 | |
| Descripción | Multi-Phase PWM Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de RT9247 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
Preliminary
RT9247
Multi-Phase PWM Controller for CPU Core Power Supply
General Description
The RT9247 is a multi-phase buck DC/DC controller
integrated with all control functions for GHz CPU VRM.
The RT9247 controls 2 or 3 buck switching stages operating
in interleaved phase set automatically. The multi-phase
architecture provides high output current while maintaining
low power dissipation on power devices and low stress on
input and output capacitors. The high equivalent operating
frequency also reduces the component dimension and the
output voltage ripple in load transient.
RT9247 controls both voltage and current loops to achieve
good regulation, response & power stage thermal balance.
Precise current loop using RDS(ON) as sense component
builds precise load line for strict VRM DC & transient
specification and also ensures thermal balance of different
power stages. The settings of current sense, droop tuning,
VCORE initial offset and over current protection are
independent to compensation circuit of voltage loop. The
feature greatly facilitates the flexibility of CPU power supply
design and tuning.
The DAC output of RT9247 supports VRD10 by 6-bit VID
input, precise initial value & smooth VCORE transient at
VID jump. The IC monitors the VCORE voltage for PGOOD
and over-voltage protection. Soft-start, over-current
protection and programmable under-voltage lockout are also
provided to assure the safety of microprocessor and power
system.
Ordering Information
RT9247
Package Type
C : TSSOP-28
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
RichTek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
`100% matte tin (Sn) plating.
DS9247-05 March 2007
Features
z Multi-Phase Power Conversion with Automatic
Phase Selection
z VRD10 DAC Output with Active Droop Compensation
for Fast Load Transient
z Smooth VCORE Transition at VID Jump
z Power Stage Thermal Balance by RDS(ON) Current
Sense
z Hiccup Mode Over-Current Protection
z Programmable Switching Frequency (50kHz to
400kHz per Phase), Under-Voltage Lockout and
Soft-Start
z High Ripple Frequency Times Channel Number
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Intel® Processors Voltage Regulator: VRD10
z Low Output Voltage, High Current DC-DC Converters
z Voltage Regulator Modules
Pin Configurations
VID4
VID3
VID2
VID1
VID0
VID125
SGND
FB
COMP
PGOOD
DVD
SS
RT
VOSS
(TOP VIEW)
28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
TSSOP-28
VCC
PWM1
PWM2
PWM3
ISN1
ISP1
ISP2
ISP3
ISN23
GND
ADJ
VDIF
VSEN
IMAX
www.richtek.com
1
1 page  
VID4
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
VID3
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
DS9247-05 March 2007
Preliminary
RT9247
Table 1. Output Voltage Program
VID2
1
0
0
0
Pin Name
VID1
1
1
0
0
VID0
1
0
1
1
VID125
X
0
1
0
Nominal Output Voltage DACOUT
No CPU
0.8375V
0.850V
0.8625V
0001
0000
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0.875V
0.8875V
0.900V
0.9125V
0.925V
0.9375V
0.950V
0.9625V
0.975V
0.9875V
1.000V
1.0125V
1.025V
1.0375V
1.050V
1.0625V
1.075V
1.0875V
1.100V
1.1125V
1.125V
1.1375V
1.150V
1.1625V
1.175V
1.1875V
1.200V
1.2125V
To be continued
www.richtek.com
5
5 Page 
Preliminary
3-Phase Converter and Components Function Grouping
Compensation
& Offset
VID
PGOOD
Droop Setting
Driver Power
UVLO
12V
DAC Offset
Voltage Setting
OCP Setting
SGND
VSEN
VDIF
PWM1
ISP1
ISN1
RT9247
COMP
FB
PWM2
ADJ
DVD
VOSS
SS
ISP2
ISN23
ISP3
PWM3
IMAX GND
VCC
BST
DRVH
SW
RT9603
IN DRVL
PGND
VCC
BST
DRVH
SW
RT9603
IN DRVL
PGND
VCC
BST
DRVH
SW
RT9603
IN DRVL
PGND
12V
12V
12V
RT9247
VCORE
Current Sense
Components
Design Procedure Suggestion
Voltage Loop Setting
a. Output filter pole and zero (Inductor, output capacitor
value & ESR).
b. Error amplifier compensation & sawtooth wave amp-
litude (compensation network).
c. Kelvin sense for VCORE.
Current Loop Setting
a. GM amplifier S/H current (current sense component
R , ISPx & ISNx pin external resistor value,
DS(ON)
keep ISPx current < 60μA at full load condition for
better load line linearity).
b. Over-current protection trip point (IMAX pin resistor,
keep ISPx current < 90μA at OCP condition for
precision issue).
DS9247-05 March 2007
VRM Load Line Setting
a. Droop amplitude (ADJ pin resistor).
b. No load offset (additional resistor in compensation
network).
c. DAC offset voltage setting (VOSS pin & compen-
sation network resistor).
Power Sequence & SS
DVD pin external resistor and SS pin capacitor.
PCB Layout
a. Kelvin sense for current sense GM amplifier input.
b. Refer to layout guide for other item.
www.richtek.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RT9247.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| RT9241 | Two-Phase DC/DC Controller for CPU Core Power Supply |  ETC |
| RT9241A | (RT9241A/B) 2-Phase DC/DC Controller |  RichTek Technology |
| RT9241B | (RT9241A/B) 2-Phase DC/DC Controller | RichTek Technology |
| RT9241CS | Two-Phase DC/DC Controller for CPU Core Power Supply | ETC |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |