參數(shù)資料
型號： SC4901ITSTRT
廠商： Semtech Corporation
英文描述： COMBI-SYNC Secondary Side Synchronous Rectifier and Regulator
中文描述： 客貨兩用，同步二次側同步整流和穩(wěn)壓器
文件頁數(shù)： 1/20頁
文件大小： 598K
代理商： SC4901ITSTRT
1
www.semtech.com
SC4901
COMBI-SYNC Secondary Side
Synchronous Rectifier and Regulator
POWER MANAGEMENT
Description
SC4901 is a unique secondary side regulator designed
for implementing Semtech’s proprietary Combi-Sync
topology for isolated convertors with multiple outputs. The
Combi-Sync is a true all-MOSFET topology that allows
synchronous rectification and post regulation of
transformer isolated outputs, resulting in higher efficiency
and low component count. Details of this unique topology
are described in the Application Information section.
United States Patent 6,788,554
Revision: May, 2005
Features
Single controller performs synchronous rectification
and post regulation
Independent regulation of multiple outputs from a
common secondary winding
Turn on shoot through inherently eliminated
Primary switch turns ON and OFF with zero current
No synchronising or any other signals needed across
the isolation boundary
Eliminates the need for a secondary bias supply
Independent soft start, ON/OFF, remote sense and
current limit for each output
Resistive or inductive current sensing with 2V current
signal and 2.5V reference for external applications.
4.5 to 18V operation
Max operating frequency to 1 MHz
Low profile 16 pin TSSOP package
Based on Semtech’s patented Combi Sync
concept
Applications
Telecom isolated DC to DC converters with multiple
low voltage outputs
High density brick and sub brick modules with
independently regulated multiple outputs
Distributed power architectures
Isolated VRMs
Typical Application Circuit
Multiple outputs can be synchronously rectified and
independently regulated by individual SC4901s. Each
output has its own ON/OFF control, soft start, remote sense
and current limits. They can be turned on or off without
affecting the primary or other outputs. The secondary side
control makes it much easier to design tight control loops
and implement load current sharing and hot swap
features. All devices are synchronised to the transformer
winding. The current sense can be either from the output
inductor for high efficiency or a resistor for better accuracy.
An amplified current signal is provided for external use.
Each device is capable of driving high side MOSFETs with
2A current. The forward drive is configured for direct
connection to a 1:1 pulse transformer. SC4901 has an
undervoltage lockout with typical turn-on threshold of 4.5V
and is available in a low cost TSSOP-16 package
QS
QF
QR
D4
T1
L1
C1
C9
C10
C2
C4
RZ
R13
RT
R5
R4
R8
R9
R1
R6
R7
R11
R14
R12
C7
C5
T2
D1
U 1
S C 4901
Z
1
C
3
C
2
C
1
O
6
S
4
X
7
P
9
P
8
V
5
A
1
O
1
R
1
V
1
V
1
R
1
SINGLE
ENDED
FORWARD
CONVERTOR
C A O
V O U T
C8
R10
R TN
D2
D3
C6
R15
CT
C3
R3
R2
相關PDF資料
PDF描述
SC4905A_06 High Performance Voltage Mode PWM Controller
SC4905AIMSTR High Performance Voltage Mode PWM Controller
SC4905AIMSTRT High Performance Voltage Mode PWM Controller
SC4905B High Performance Voltage Mode PWM Controller
SC4905BIMSTR High Performance Voltage Mode PWM Controller
相關代理商/技術參數(shù)
參數(shù)描述
SC4905A 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:HIGH PERFORMANCE VOLTAGE MODE PWM CONTROLLER
SC4905A_06 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Voltage Mode PWM Controller
SC4905AIMSTR 制造商:Semtech Corporation 功能描述:IC, VOLTAGE MODE PWM CTRL, 12V, MSOP-10; Input Voltage:48V; Output Voltage:500mV; Output Current:1mA; Supply Voltage Min:0V; Supply Voltage Max:12V; Digital IC Case Style:MSOP; No. of Pins:10; Frequency:1MHz; Control Mode:Voltage ;RoHS Compliant: No
SC4905AIMSTRT 制造商:Semtech Corporation 功能描述:Voltage Mode PWM Controller 10-Pin MSOP T/R
SC4905AMSTR 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:HIGH PERFORMANCE VOLTAGE MODE PWM CONTROLLER
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