|
|
PDF SC2646B Data sheet ( Hoja de datos )
| Número de pieza | SC2646B | |
| Descripción | Combi-Sense PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SC2646B (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
POWER MANAGEMENT
Description
The SC2646B controller provides a microprocessor core
voltage regulation solution for up to 4 paralleled PWM
channels. The solution can be configured in 2, 3, or 4-
phase form. This multi-phase buck regulator utilizes
phase-shift timing control to allow interleaved switching
of the power switches. The product’s architecture mini-
mizes the core voltage ripple and the input current ripple,
which leads to optimized voltage regulator design for
power density, transient responses, and thermal
performances.
To satisfy the highly dynamic nature of the modern micro-
processors, the SC2646B adopts peak current mode
control topology which ensures wide control loop band-
width and fast transient responses. The current mode
control provides intrinsic phase current matching. The
maximum ripple frequency is greater than 2MHz.
SC2646B
2, 3 or 4 Phase
Combi-SenseTM PWM Controller
Features
VRD/VRM10.X compliant
Core Voltage Set Point Accuracy 0.5%
Combi-SenseTM Current Mode Control
Intrinsic Phase Current Matching
Fast Transient Responses
Active Droop to Meet Load Line Slope
Enable Function for Power Sequencing
Cycle-by-Cycle Peak Current Limit
Intelligent Over Current Shut Down
Over Voltage Protection When Using Semtech
Combi-SenseTM Driver SC1211
Under Voltage Protection Built in
Externally Programmable Soft-Start
Externally Programmable Switching Frequency
2, 3, or 4-Phase Configurations
24-Pin TSSOP Package
One of the outstanding features of the SC2646B device
is its voltage regulation accuracy. Not only does it pro-
vide 0.5% set point accuracy, but also the accuracy to
be fully compliant with stringent load line slope specifi-
cations mandated by the modern microprocessors.
Lossless output current sensing ensures the regulator
output voltage is accurately positioned according to the
load current condition.
Semtech’s patented Combi-SenseTM topology is employed
by SC2646B controller. The MOSFET Rds(on) and the out-
put inductor winding resistance is used to generate the
phase current information. Semtech’s SC1211 Combi-
SenseTM MOSFET driver works with the SC2646B to en-
able a complete solution.
Combi-SenseTM is a Trademark of Semtech Corporation
Applications
Voltage Regulator VRD/VRM10.X
Voltage Regulation Modules
High Current, Low Voltage Step Down DC/DC
Converters
The cycle-by-cycle current limit plus the intelligent over
current shut down provide the maximum versatility of
the system without false tripping under all possible
changes of VID and load conditions. The differential
voltage feedback sense eliminates the error caused by
high load current on the ground plane. External offset is
easy to achieve for the VID settings. The enable func-
tion is also provided to interface with the corresponding
system signal for correct start up timing and shut down
timing.
Revision: Apr. 11, 2005
1
www.semtech.com
1 page  
SC2646B
wwPw.ODaWtaSEheRet4MU.cAomNAGEMENT
Pin Configurations
Top View
OS3
OS2
OS1
BGOUT
ERROUT
GSENSE
FB
MSENSE
VCC
VID4
VID3
VID2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
(24-Pin TSSOP)
Pin Descriptions
OS4
OUTSEN
OUT4
OUT3
OUT2
OUT1
AGND
OSCREF
PGOOD
VID5
VID0
VID1
Ordering Information
Part Number
SC2646BTSTRT (1) (2)
Package
TSSOP-24
Temp. Range (TJ)
0 to 125 OC
SC2646BEVB
Embedded Evaluation Board
Note:
(1) Only available in tape and reel packaging. A reel contains 2500 devices
for the TSSOP-24 package.
(2) Lead free package.Device is fully WEEE and RoHS compliant.
Pin# Pin Name
Pin Function
1 OS3 Current sense input
2 OS2 Current sense input. Connect to OUTSEN for 2 phase operation.
3 OS1 Current sense input
4 BGOUT Bandgap reference voltage. Connect soft start cap to AGND.
5 ERROUT Error-amplifier output. Connect compensation network to AGND.
6 GSENSE Remote sense for GND.
7 FB Feedback pin. Route FB and Gsense as differential pair to CPU sense point.
8 MSENSE Voltage regulator module output current sense.
9 VCC Power supply for chip.
10 VID[4:0] VID MSB to LSB.
15 VID5 12.5mV bit.
16 PGOOD Power good. Open collector output.
17 OSCREF Oscillator frequency setting. Connect a resistor to AGND.
18 AGND Clean ground for analog signals.
19 OUT1 PWM output1.
20 OUT2 PWM output2.
21 OUT3 PWM output3.
22 OUT4 PWM output4. Connect to VCC for 3 phase operation.
23 OUTSEN Direct output sense.
24 OS4
© 2005 Semtech Corp.
Current sense input. Connect to OUTSEN for 2 or 3 phase operation.
5
www.semtech.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SC2646B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC2646B | Combi-Sense PWM Controller | Semtech Corporation |
| 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 |