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參數資料
| 型號： | SC4812STRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp |
| 中文描述： | 電流模式PWM控制器，帶有集成啟動電路和運算放大器 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 219K |
| 代理商： | SC4812STRT |
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www.semtech.com
SC4812
Current Mode PWM Controller with
Integrated Start-up Circuit and Op Amp
POWER MANAGEMENT
Description
The SC4812 is a highly integrated current mode PWM
controller designed for isolated or non-isolated dc-dc con-
verters in telecommunication and data communication
applications. It minimizes the amount of external discrete
components needed and leads to substantial cost and
space saving converter designs.
Revision: February 6, 2007
Features
Wide input range 12V to 90V
High-voltage start-up circuit
Current mode control
Transconductance error amplifier
Leading-edge blanking
Cycle by cycle current limit
Programmable external soft-start
Thermal shutdown
SO-8 package. Fully WEEE and RoHS compliant
Applications
IP phones, PoE
Telecom isolated converters
Off-line isolated power supplies
Instrumentation power supplies
Battery chargers
Typical Application Circuit
The circuitry of the SC4812 includes an integrated high
voltage start-up circuit suitable for telecom/industrial
voltage applications. It is disabled during regular opera-
tion and improves efficiency. Current mode control with
leading-edge blanking simplifies control loop design and
internal ramp compensation circuit stabilizes the current
loop when operating above 50% duty cycle. Internal er-
ror amplifier could be used for non-isolated applications.
C6
C4
R1
R4
C3
C2
C5
R3
Q1
C1
R5
V
1
SS/SHDN
4
FB
2
COMP
3
CS
5
GND
6
OUT
7
V
8
U1
SC4812
D1
R2
Vin
T1
Vout
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SC4819 | 制造商:SEMS SCREWS 功能描述: |
| SC483 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| SC483ITSTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| SC486 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Memory Power Supply |
| SC486EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Memory Power Supply |
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