SC4905AIMSTRT Semtech, SC4905AIMSTRT Datasheet

SC4905AIMSTRT

Manufacturer Part Number

SC4905AIMSTRT

Description

IC, VOLTAGE MODE PWM CTRL, 12V, MSOP-10

Manufacturer

Semtech

Datasheet

1.SC4905B.pdf (24 pages)

Specifications of SC4905AIMSTRT

Input Voltage

48V

Output Voltage

500mV

Output Current

1mA

Frequency

1MHz

Power Dissipation Pd

180mW

Supply Voltage Range

0V To 12V

Digital Ic Case Style

MSOP

No. Of Pins

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Revision: January 4, 2006

The SC4905A/B is a 10 pin BICMOS primary side voltage

mode controller for use in Isolated DC-DC and off-line

switching power supplies. It is a highly integrated solution,

requiring few external components. The device features a

high speed oscillator with integrated feed forward

compensation, accurately programmable maximum duty

cycle, voltage mode of operation, line voltage monitoring,

supply UVLO, low start up current, low voltage current limit

threshold and user accessible reference.

The SC4905A/B device operates at 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 (180

degrees apart) which reduces input ripple and filter size.

The SC4905A has a typical turn-on threshold of 4.4V

and the SC4905B has a typical turn-on threshold of

about 11.6 volts.

These devices are available in the 10 lead MSOP

package.

POWER MANAGEMENT

Typical Application Circuit

Description

Applications

Features

High Performance Voltage Mode

Operation to 1MHz

Accurate programmable maximum duty cycle

Integrated oscillator/voltage feed forward

compensation

Line voltage monitoring

External frequency synchronization

Bi-phase mode of operation for ripple reduction

Under 100µA start-up current

Accessible reference voltage

VDD undervoltage lockout

-40°C to 105°C operating temperature

10-Pin MSOP Lead-free package available.

Telecom equipment and power supplies

Networking power supplies

Power over LAN applications

Industrial power supplies

Isolated power supplies

Fully WEEE and RoHS compliant

PWM Controller

SC4905A/B

www.semtech.com

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