SC4901

更新时间： 2024-01-22 23:07:00

品牌	Logo	应用领域
商升特 - SEMTECH		调节器
页数	文件大小	规格书
20页	586K
描述
COMBI-SYNC Secondary Side Synchronous Rectifier and Regulator

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SC4901 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP, TSSOP16,.25	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.73
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER	控制模式：	VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	18 V
最小输入电压：	4.5 V	标称输入电压：	12 V
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e3
长度：	5 mm	功能数量：	1
端子数量：	16	最高工作温度：	125 °C
最低工作温度：	-40 °C	最大输出电流：	2 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装等效代码：	TSSOP16,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	座面最大高度：	1.2 mm
子类别：	Switching Regulator or Controllers	表面贴装：	YES
切换器配置：	PUSH-PULL	最大切换频率：	1000 kHz
温度等级：	AUTOMOTIVE	端子面层：	MATTE TIN
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	4.4 mm	Base Number Matches：	1

SC4901 数据手册

SC4901

COMBI-SYNC Secondary Side

Synchronous Rectifier and Regulator

POWER MANAGEMENT

Description

Features

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.

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

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.

Applications

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

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

V O U T

SINGLE

ENDED

• •

FORWARD

CONVERTOR

R10

R TN

R11

R12

R13 D3

R14

U 1

S C 4901

C A O

C10

R15

United States Patent 6,788,554

Revision: May, 2005

www.semtech.com

12 3 4 5 6 7...20

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