SC4809C
SC4809C is High Performance Current Mode PWM Controller manufactured by SEMTECH.
- Part of the SC4809A comparator family.
- Part of the SC4809A comparator family.
High Performance Current Mode PWM Controller
POWER MANAGEMENT Description
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 ponents. 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 .. Tele 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 acmodate a wide variety of applications. These devices are available in the MSOP- 10 lead free package.
SC4809A/B/C
Features
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 Ro HS pliant
Applications
Tele equipment and power supplies Networking power supplies Power over LAN applications Industrial power supplies Isolated power supplies
Typical Application Circuit
+48V
T1
C1 R1 R2 D1 D2 U1 SC4809
1 VDD VREF 10
C7 U2 SC1301
1 IN EN 5
C8
Vout
R3
LUVLO
SYNC
SYNC
Q2
GND OUT 4
R12
R13
DMAX
R9
U3...
