SC4810BIMLTRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC4810BIMLTRT

High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay

Semtech Corporation 

SC4810B/E

POWER MANAGEMENT

Application Information (Cont.)

VBias

VREF

guaranteed synchronization. SYNC pin should be

grounded if synchronization is unused. (The patent for

the synchronization scheme is pending).

The synchronous function is illustrated as in Fig. 10.

R3

Vout

R4

R5

SC431

R1

FB

R2

GND

Fig.9 Cycle-by-cycle over-current limitation

VFB = 2 • VCS + 1.3V........(3)

VFB

=

VREF

•

R2

R1 + R2

........( 4)

Synchronization

SC4810 features a special synchronization function

which is leading-edge triggered with a threshold set to

2.1V. Applications like multi-phase interleaving can be

achieved using the SYNC pin. When the SYNC pin is con-

nected to the RCT pin of the master SC4810, the out-

puts of the two SC4810’s will be out of phase. The fre-

quency of the master SC4810 clock signal should be at

least 30% faster than that of the slave SC4810 for the

3V

2.1V

Clock Signal of the Master SC4810

VRCT

0V

t

OUT1 of the Master SC4810

0V

t

OUT1 of the Slave SC4810

0V

t

Fig. 10 Illustration for Synchronization

 2006 Semtech Corp.

14

www.semtech.com

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