SC4911 Datasheet PDF | Semtech Corporation

Semtech Corporation SC4911

The SC4911 is a highly integrated bias/primary side PWM controller designed for off-line or isolated dc-dc converters in telecommunication and data communication applications. The high degree of integration minimizes the amount of discrete parts needed and leads to substantial cost and space saving converter designs. The circuitry of the SC4911 includes line voltage UVLO featuring startup current less than 50µA and programwww.DataSheet4U.com mable switching frequency.

Part No.	SC4911
Datasheet	SC4911 Download
Manufacturer	Semtech Corporation
Description	Bias/Primary Side PWM Controller
Buy	Stock & Price

DESCRIPTION

The device supply is derived from an auxiliary winding on the transformer. The auxiliary winding could also provide output feedback information if an optocoupler is not used. SC4911

FEATURES

Programmable switching frequency up to 500kHz Line UVLO Protection Undervoltage Lockout Low startup current (45µA) Cycle by cycle current limit 8 pin MSOP. Available in Lead-free, fully WEEE and RoHS compliant

APPLICATIONS

Telecom isolated converters Offline isolated power supplies Instrumentation power supplies Battery chargers Typical Application Circuit D1 C1 C2 C3 R2 R3 R4 C4 C6 U1 SC4911 Q1 1 8 T1 D2 R1 Vin Vout C5 R5 LUVLO 3 VCC FB OUT 7 4 R7 C7 COMP GND RT ILIM 5 R6 C8 R8 2 R9 Revision: April 5, 2006 6 1 SC4911 POWER MANAGEMENT

ABSOLUTE MAXIMUM RATINGS

Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the

ELECTRICAL CHARACTERISTICS

section is not implied. Par...