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參數(shù)資料
| 型號(hào)： | SC4809B |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Current Mode PWM Controller |
| 中文描述： | 高性能電流模式PWM控制器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 328K |
| 代理商： | SC4809B |
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www.semtech.com
SC4809A/B/C
High Performance Current Mode
PWM Controller
POWER MANAGEMENT
Description
Revision: September 21, 2005
Features
Applications
Telecom equipment and power supplies
Networking power supplies
Power over LAN applications
Industrial power supplies
Isolated power supplies
Typical Application Circuit
Operation to 1MHz
Accurate programmable maximum duty cycle
Line voltage monitoring
External frequency synchronization
Bi-phase mode of operation for low ripple
Under 100μA start-up current
Accessible reference voltage
VDD undervoltage lockout
-40°C to 105°C operating temperature
10 lead MSOP package. Lead free package available.
Fully WEEE and RoHS compliant
The SC4809A/B/C is a 10 pin BICMOS primary side
current mode controller for use in Isolated DC-DC and
off-line switching power supplies. It is a highly integrated
solution, requiring few external components. It features
a high frequency of operation, accurately programmable
maximum duty cycle, current mode control, line voltage
monitoring, supply UVLO, low start-up current, and
programmable soft start with user accessible reference.
It operates in a fixed frequency, highly desirable for
Telecom applications. Features a separate sync pin which
simplifies synchronization to an external clock. Feeding
the oscillator of one device to the sync of another forces
biphase operation which reduces input ripple and filter
size.
The SC4809A/B/C have different threshold and VREF
to accommodate a wide variety of applications.
These devices are available in the MSOP–10 lead free
package.
C1
C5
C4
+48V
-- 48V
R6
C2
R7
R2
U4
SC4431
VCC
3
OUT
4
IN
1
EN
5
GND
2
SU2
Q2
R11
R10
T1
C6
U3
R9
R3
R1
R12
D1
C7
D2
C8
C9
R14
R13
Vout
DISABLE
VDD
1
LUVLO
2
SYNC
3
RCT
4
FB
7
GND
8
OUT
9
VREF
10
DMAX
5
SS
6
U1
SC4809
SYNC
Q1
R4
R5
R8
C3
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| SC4809C | High Performance Current Mode PWM Controller |
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| SC480EVB | Complete DDR1/2/3 Memory Power Supply |
| SC480IMLTRT | Complete DDR1/2/3 Memory Power Supply |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC4809C | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Current Mode PWM Controller |
| SC4809CIMSTRT | 制造商:Semtech Corporation 功能描述:SC Series 25 mA 1100 kHz High Performance Current Mode PWM Controller - MSOP-10 |
| SC480EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Memory Power Supply |
| SC480IMLTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Complete DDR1/2/3 Memory Power Supply |
| SC4810B | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
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