SRM4010 datasheet(9/11 Pages) MICROSEMI

9 / 11 page

Microsemi

Colorado Division

800 Hoyt Street, Broomfield, CO. 80020, 303-469-2161, Fax: 303-466-3775

Page 9

2000

2003-02-05 Rev. IR

SRM4010

40A Synchronous Rectifier Module

CO L O RA D O DI V I S I O N

Very Low Output Voltage Converter

For voltages below 1.25 volts, R3 can be moved to REG out to allow regulation below the 1.24 volt reference as shown in Figure 8. In

this case the REGOUT is used to feed current into the TLV431’s summing node. This causes the output to regulate at a voltage lower than

the reference. There are other variations of closing the feedback loop that can be used, but in many cases the availability of the REGOUT

makes the task easier.

In applications where the peak transformer voltage is less than about 8 volts, power can be supplied to the module through an additional

winding on the power transformer. This requires only the additional winding and one diode. This is illustrated in figure 8 with

transformer winding T1E and D4.

Figure 8

SRM4010 Configured for outputs below 1.25 Volts

T1C

CURRENT

MODE

CONTROL

T1E

TLV431A

T6D

22 PF

SRM4010

CTCH

FWD

Sgnd

REGin

REGout

Pgnd

CDLY

CPDT SPD

T1B

T1A

ISO1

47 PF

SRM4010 Datasheet(PDF) 9 Page - Microsemi Corporation