AV45C datasheet(19/25 Pages) ASTEC

19 / 25 page

V 4

4 5

5 C

C Q

Q u

u a

a rrrrtttte

e rrrr--B

B rrrriiiic

c k

k S

S e

e rrrriiiie

e s

s 1

1 0

0 0

0 W

W P

P o

o w

w e

e rrrr C

C o

o n

n v

v e

e rrrrtttte

e rrrrs

3 6

6 V

V d

d c

c tttto

o 7

7 5

5 V

V d

d c

c IIIIn

n p

p u

u tttt,,,, S

S iiiin

n g

g lllle

e O

O u

u ttttp

p u

u tttt

-19-

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Output T

Output Trimming

rimming

Users can increase or decrease the output volt-

age set point of a module by connecting an

external resistor between the TRIM pin and

either the SENSE (+ ) or SENSE ( - ) pins. The

trim resistor should be positioned close to the

module. If not using the trim feature, leave

the TRIM pin open.

Trimming up by more than 10% of the nominal

output may damage the converter or trig the

OVP protection. Trimming down more than

20% can cause the converter to regulate

improperly. Trim down and trim up circuits and

the corresponding configuration are shown in

Figure 10 to Figure 14.

Note that at elevated output voltages the

maximum power rating of the module

remains the same, and the output current

capability will decrease correspondingly.

% Change In Output Voltage (y)

200

400

600

800

1000

1200

1400

1600

024

5.1Vo(100+y)

Radj-up =

510

1.225y

VI(+)

VI(–)

CNT

VO(+)

VO(–)

SENSE(+)

TRIM

SENSE(–)

Radj-up

RLOAD

where y is the adjusting percentage of the voltage.

0 < y < 10

Radj-up is in k

Ω.

- 10.2

Fig.12 Resistor Selection for 5Vout

Trimming Up

Fig.10 Circuit Configuration and Equation

to Trim Up Output Voltage

% Change In Output Voltage (y)

100

125

150

175

200

225

250

Radj-down =

0 < y < 20

where y is the adjusting percentage of the voltage.

Radj-up is in k

Ω.

VI(+)

VI(–)

CNT

VO(+)

VO(–)

SENSE(+)

TRIM

SENSE(–)

Radj-down

RLOAD

510

- 10.2

Fig.14 Resistor Selection for Trimming

Down Output

Fig.11 Circuit Configuration and Equation

to Trim Down Output Voltage

Fig.13 Resistor Selection for 1.8Vout

Trimming Up

% Change In Output Voltage (y)

100

150

200

250

300

350

400

450

500

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