AGQ150-48S05 DC-DC Converter

9/13

http://www.emersonnetworkpower.com.cn

Trim Characteristics

determine the external resistance to obtain the trimmed output voltage.

)

(

2

.

10

510

Ω

−

Δ

=

−

k

R

down

trim

()

)

(

2

.

10

510

225

.

1

100

1

.

5

Ω

−

Δ

−

Δ

×

Δ

+

×

×

=

−

k

V

R

nom

up

trim

△

nom

V

: Nominal output voltage

For example, to get 5.5V output, the trimming resistor is

()

)

(

8

.

167

2

.

10

5

/

100

)

5

5

.

5

(

510

5

/

100

)

5

5

.

5

(

225

.

1

5

/

100

)

5

5

.

5

(

100

5

1

.

5

Ω

=

−

×

−

−

×

−

×

×

−

+

×

×

=

−

k

R

up

trim

The output voltage can also be trimmed by potential applied at the Trim pin.

5

.

2

041

.

2

+

=

trim

o

V

V

Where

trim

V

is the potential applied at the Trim pin, and

o

V

is the desired output voltage.

When trimming up, the output current should be decreased accordingly so as not to exceed the

maximum output power.

Load

Cout

Vo+

S+

Trim

S-

Vo-

Load

Vo+

S+

Trim

S-

Vo-

Cout

Figure 13 Trim up

Figure 14 Trim down