21-Nov-11

Application Notes

Trim up resistor=

A

1-

- C

k Ω

Vnom

Vrequired

R

=

trim-up

Trim down resistor=

B

-1

- C

k Ω

Vnom

Vrequired

R

=

trim-down

= R Trim-up

1

= R-Load

2

= R Trim-down

3

Trim up, dual output

Trim down, dual output

+Vout

Com

Trim

-Vout

+Vin

-Vin

+Vout

Com

Trim

-Vout

+Vin

-Vin

1

2

2

2

2

3

Trim up, single output

Trim down, single output

1

2

2

3

+Vin

+Vout

-Vin

-Sense

-Vout

Trim

+Sense

+Vin

+Vout

-Vin

-Sense

-Vout

Trim

+Sense

MTC75 & 150

S3V3

S05

S12

S15

S28

D12

D15

A

9.826

15

21.907

28.028

54.622

46.446

58.524

B6

5

2.55

2.55

2.55

2.55

2.55

C

5.1

5.1

5.1

5.1

9.1

9.1

9.1

Remote On/Off

This is an active low signal referenced to -Vin. If >3.5V (or open circuit) is applied, the output is on. If <1.8V (or short circuit) is applied, the output

is off. If module inhibit is not required, leave the pin floating.

Thermal Warning (Tw)

This is an open collector signal with emitter connected to –Vin. Transistor is off under normal conditions and is turned on when trip threshold is

exceeded (typically 105 ˚C).

Thermal Shutdown

The output of the module can be optionally turned off under a high temperature condition by connecting the Thermal Warning (TW) pin directly to

the Remote On/Off pin. Auto resetting.

Synchronization

The internal switching frequency can be synchronized to an external source within the range 450 to 550 kHz (MTC75 & 150) or 400 to 500 kHz

(MTC35 & 50). If two modules or more are synchronized, they will run at the highest frequency. Connect synchronization pins directly together.

Share

Up to four modules can be forced to share by connecting the share pins directly together, derate maximum output to 90% of total power. (MTC75

& 150 W only)

Output Trim

In order to trim the output voltage of the singles up or down, connect the trim resistor either between the trim pin and +sense for trimming-up or

between trim pin and -sense for trimming-down. In order to trim the output voltage of the duals up or down, connect the trim resistor either between

the trim pin and +Vout for trimming up or between trim pin and -Vout for trimming down. The trimming output voltage range is ±10% on 3V3 output

voltage and -20% to +10% rated output voltage on others. See diagram & table below.

MTC Series

MTC35 & 50

S3V3

S05

S12

S15

S28

A

9.826

15

43.814

56.056

81.993

B6

5

5.1

5.1

3.825

C

5.1

5.1

5.1

5.1

9.1