|
|
PDF SC1175 Data sheet ( Hoja de datos )
| Número de pieza | SC1175 | |
| Descripción | Low Power Dual Synchronous DC/DC Controller | |
| Fabricantes | Semtech | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SC1175 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
|
No Preview Available !
SC1175
Low Power Dual Synchronous DC/DC
Controller With Current Sharing Circuitry
POWER MANAGEMENT
Description
Features
The SC1175 is a versatile 2 phase, synchronous, volt-
age mode PWM controller that may be used in two dis-
tinct ways. First, the SC1175 is ideal for applications
where point of use output power exceeds any single in-
put power budget. Alternatively, the SC1175 can be used
as a dual switcher. The SC1175 features a temperature
compensated voltage reference, over current protection
with 50% fold-back and internal level-shifted, high-side
drive circuitry.
300kHz fixed frequency operation
Soft Start and Enable function
Power Good output provided
Over current protection with 50% fold-back
Phase-shifted switchers minimize ripple
High efficiency operation, >90%
Programmable output(s) as low as 1.25V
Industrial temperature range
20 pin SOIC or TSSOP package
In current sharing configuration, the SC1175 can pro-
duce a single output voltage from two separate voltage
sources (which can be different voltage levels) while
maintaining current sharing between the channels. Cur-
rent sharing is programmable to allow loading each input
supply as required by the application.
In dual switcher configuration, two feedback paths are
provided for independent control of the separate out-
puts. The device will provide a regulated output from
flexibly configured inputs (3.3V, 5V, 12V), provided 5V is
present for VCC. The two switchers are 180° out of phase
to minimize input and output ripple.
Two Phase, Current Sharing Controller
Flexible, same or separate VIN
Programmable current sharing
Combined current limit with fold-back
2 phases operating opposed for ripple reduction
Thermal distribution via multi-phase output
Two Independent PWM Controllers
Flexible, same or separate VIN
Independent control for each channel
Independent and separate current limit
2 phases operating opposed for ripple reduction (if
same VIN used)
Applications
Graphics cards
DDR Memory
Peripheral add-in card
SSTL Termination
Dual-Phase power supply
Power supplies requiring two outputs
Revision: September 22, 2004
1
www.semtech.com
1 page  
SC1175
POWER MANAGEMENT
Pin Configuration
Top View
(SOIC-20 and TSSOP-20 Pin)
Pin Descriptions
Expanded Pin Description
Ordering Information
Device(1)
Package
SC1175CSW.TR
SOIC-20
SC1175CSWTRT(2)
SC1175TS.TR
TSSOP-20
SC1175TSTRT(2)
SC1175EVB-1
Current Share Version Evaluation
Board
SC1175EVB-2
Dual Channel Version Evaluation
Board
Notes:
(1) Only available in tape and reel packaging. A reel
contains 1000 (SOIC) and 2500 (TSSOP) devices.
(2) Lead free product. This product is fully WEEE and
RoHS compliant.
Pin 1: (VREF)
Internal 1.25V reference
Connected to the + input of the master channel error
amplifier.
Pin 2: (+IN)
+ Input of slave channel error amplifier.
Connected to 1.25V reference (Pin 1) for the two
independent channel configuration.
Pin 3, 18: (-IN2, -IN1)
- Inputs of close loop error amplifiers.
Works as a feedback inputs (For both modes).
Pin 4: (VCC)
VCC chip supply voltage.
15V maximum, 10mA typical.
Needs a 1µF ceramic multilayer decoupling capacitor
to GND (Pin 20).
Pin 5, 6,15, 16: (CL2-, CL2+, CL1+, CL1-)
Pins (-) and (+) of the current limit amplifiers for both
channels.
Connected to output current sense resistors. Com-
pares that sense voltage to internal 75mV reference.
Needs RC filter for noise rejection.
Pin 7, 14: (BST2, BST1)
BST signal. Supply for high side driver.
Can be connected to a high enough voltage source.
Usually connected to bootstrap circuit.
Pin 8, 13: (DH2, DH1)
DH signal (Drive High).
Gate drive for top MOSFETs.
Requires a small series resistor.
2004 Semtech Corp.
Pin 9, 12: (DL2, DL1)
DL signal (Drive Low).
Gate drive for bottom MOSFETs.
Requires a small series resistor.
Pin 10: (PGND)
Power GND. Return of gate drive currents.
Pin 11: (BSTC)
Supply for bottom MOSFETs gate drive.
Pin 17: (SS/ENA)
Soft start pin. Internal current source connected to
external capacitor.
Inhibits the chip if pulled down.
Pin 19: (PWRGD)
Power good signal.
Open collector signal .
Turns to 0 if output voltage is outside the power good
window.
Pin 20: (GND)
Analog GND.
5 www.semtech.com
5 Page 
POWER MANAGEMENT
Evaluation Board Schematic - 2 Channel with Current Sharing
SC1175
2004 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet SC1175.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC1172 | Programmable Synchronous DC/DC Converter |  Semtech Corporation |
| SC1173 | Programmable Synchronous DC/DC Converter | Semtech Corporation |
| SC1175 | Low Power Dual Synchronous DC/DC Controller | Semtech |
| SC1176 | Dual Synchronous Voltage Mode 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 |