TRIM – SINGLE OUTPUT MODELS ONLY

Formula Values by Model

3.3V

5V

12V

15V

A

3.7

3.7

14

18.2

B

10

10

30

30

Positive

Input

Input

Common

Sync.

Positive

Output,

Main (+5)

Output

Common

Positive

Output,

Auxiliary

Negative

Output,

Auxiliary

Feedback Isolator

Feedback Isolator

PWM CM

Controller

PWM CM

Controller

(

Trim up:

(

2.5A

Positive Input

1

10

Input Common

MHV

2

4

Case*

*The case ground connection should be as low an impedance as possible to minimize EMI.

Direct contact of baseplate to chassis ground provides the lowest impedance.

Chassis Ground

6, 7, 8

Positive Input

1

5

28V

Input Common

FMC-461

or FMH-461

EMI FILTER

Positive Output

Output Common

3

% V

110

106

102

95

90

80

MHV283R3S

18

36

128

4

n/a

n/a

MHV2805S

8

20

81

23

5

n/a

MHV2812S

n/a

19

116

177

67

11

MHV2815S

0.3

21

122

255

104

28

5

MHV SERIES

15 WATT

DIAGRAMS

Positive Input

1

9

2

10

28V

Sync In

Inhibit (pin 8 on triple

output models)

Input Common

MHV

Notes

If calculated result is a negative value, the desired output voltage is outside the allowed trim range.

When trimming up, do not exceed the maximum output power.

When trimming down, do not exceed the maximum output current.

Calculated Trim

Quick Reference Trim Table

3

TRIM

5

4

OUTPUT

COMMON

MHV

SINGLE

OUTPUT

TRIM DOWN

TRIM UP