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PDF SC1176 Data sheet ( Hoja de datos )
| Número de pieza | SC1176 | |
| Descripción | Dual Synchronous Voltage Mode Controller | |
| Fabricantes | Semtech Corporation | |
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SC1176/SC1176A
Dual Synchronous Voltage Mode
Controller with Current Sharing Circuitry
POWER MANAGEMENT
Description
Features
The SC1176 is a versatile 2 phase, synchronous, volt-
age mode PWM controller that may be used in two dis-
tinct ways. First, the SC1176 is ideal for applications
where point of use output power exceeds any single in-
put power budget. Alternatively, the SC1176 can be used
as a dual switcher. The SC1176 features a temperature
compensated voltage reference, over current protection
with 50% fold-back and internal level-shifted, high-side
drive circuitry.
In current sharing configuration, the SC1176 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.
The SC1176A has the phases of the Master and the Slave
inverted.
It offers a different pattern for ripple cancellation and
prevents phase fold back during current limit.
The two chips are pin compatible.
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 .9V
Industrial temperature range
SOIC-20 or TSSOP-20 pin Lead free package. This
product is fully WEEE and RoHS compliant
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: June 29, 2006
1
www.semtech.com
1 page  
SC1176/SC1176A
POWER MANAGEMENT
Pin Configuration
Top View
Ordering Information
Device(1)
Package(2)
SC1176CSWTR
SC1176CSWTRT
SOIC-20
SC1176ASWTR
SC1176ASWTRT
SC1176TSTR
SC1176TSTRT
TSSOP-20
SC1176ATSTR
SC1176EVB-1
Current Share Version Evaluation
Board
SC1176-2EVB-2
Dual Channel Version Evaluation
(SOIC-20 and TSSOP-20 Pin)
Pin Descriptions
EXPANDED PIN DESCRIPTION
Notes:
(1) Only available in tape and reel packaging. A reel
contains 1000 (SOIC) or 2500 (TSSOP) devices.
(2) Lead free product. This product is fully WEEE and
RoHS compliant.
Pin 1: (VREF)
Internal .9V reference
Connected to the + input of the master channel error
amplifier.
Pin 2: (+IN2)
+ Input of slave channel error amplifier.
Connected to .9V reference (Pin 1) for
2 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, 15mA 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 serie resistor.
Pin 9, 12: (DL2, DL1)
DL signal (Drive Low).
Gate drive for bottom MOSFETs.
Requires a small serie 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 he 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.
Return of analog signals and bias of chip.
2006 Semtech Corp.
5
www.semtech.com
5 Page 
SC1176/SC1176A
POWER MANAGEMENT
Evaluation Board Schematic - 2 Channel with Current Sharing
SC1176
2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet SC1176.PDF ] | |
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