MGDM-75_技术文档

Hi-Rel DC/DC CONVERTER

MGDM-75 : 75W POWER

Hi-Rel

Grade

5:1 Ultra Wide Input

Single Output

Metallic case - 1.500 VDC Isolation

• Ultra wide input range 16-80 Vdc, 9-45 Vdc

• 28Vdc input compliant with MIL-STD-704A/D/F

• Industry standard quarter brick package

• Power up to 75 W

• Wide temperature range : -40°C/+ 105° baseplate

• High efficiency (typ. 86%-90%)

• Soft start

1-General

• Galvanic isolation 1.500 VDC

• Integrated LC EMI filter

filters to minimize reflected input current ripple

and output voltage ripple.

The MGDM-75 series is a complete line of high

density wide input range DC/DC power modules

designed for aerospace, military and high-end

industrial applications. These modules use a

patented fixed switching topology at 420 KHz

providing ultra wide input range, low noise

characteristics and high power density. Standard

models are available with ultra wide input vol-

tage range of 9-45, 16-80 volts. The series

include single output voltage choices of 3.3, 5,

12, 15, 24, 28 volts.

The MGDM-75 series include synchronization, trim

and sense functions.

The synchronization function allows to synchronize

more than one converter to one frequency or an

external source frequency.

• Synchronizable

The modules have totally independant security

functions including input undervoltage lock-out,

output overvoltage protection, output current

limitation protection, and temperature protec-

tion. Additionnally a soft-start function allows

current limitation and eliminates inrush current

during start-up.

The design has been carried out with surface

mount components, planar transformer and is

manufactured in a fully automated process to

guarantee high quality. The modules are potted

with a bi-component thermal conductive

compound and used an insulated metallic subs-

trat to ensure optimum power dissipation under

harsh environmental conditions.

• Fully protected by independant security

• Under & overvoltage lock-out

• Overvoltage protection

• Current limitation protection

• Overtemperature protection

• No optocoupler for high reliability

4

All the modules are designed with LC network

2-Product Selection

Single output model : MGDS-75-

(/T) and/or (/S)

(/T) : option for -55°C start up operating temperature

(/S) : option for screening and serialization

Input Voltage Range

Permanent

Output

B : 3.3 VDC

C

:

5 VDC

E : 12 VDC

15 VDC

H

:

9-45 VDC

O : 16-80 VDC

F

:

I : 24 VDC

J : 28 VDC

REDEFINING THE SOURCE OF POWER

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MGDM-75 Series

2- Product Selection (continued)

Input range

Output

Current

Reference

Options

9-45 VDC

3.3 VDC

5 VDC

12 VDC

15 VDC

24 VDC

28 VDC

15 A

12,5 A

6,25 A

5 A

3,125 A

2,7 A

MGDS-75-H-B

MGDS-75-H-C

MGDS-75-H-E

MGDS-75-H-F

MGDS-75-H-I

MGDS-75-H-J

/T , /S

16-80 VDC

3.3 VDC

5 VDC

12 VDC

15 VDC

24 VDC

28 VDC

15 A

6,25 A

5 A

3,125 A

2,7 A

MGDS-75-O-B

MGDS-75-O-C

MGDS-75-O-E

MGDS-75-O-F

MGDS-75-O-I

MGDS-75-O-J

/T , /S

4

Converter Selection Chart

M G D S - 75 - O - E / T

Number of Outputs :

S : single output

Input voltage range :

H : 9-45 VDC

O : 16-80 VDC

Output voltage :

See table page 1

Option :

(/T) : -55°C start up

(/S) : screening and

serialization (consult

application note

«screening grades»)

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3- Block Diagram

The MGDM-75 DC/DC converter is based on a cons-

tant 420KHz pulse-width modulated forward topology

designed for ultra large input range.

As this auxilliary power is independent from the main

power supply, the module features a wide trim

windows from 90% to 110% of the nominal output

voltage.

The output voltage is monitored on the secondary

side avoiding the use of optocoupler to optimize

long-term reliability and provide good immunity

against radiations.

The main power transformer designed for more than

75W power is a multi-layer planar transformer which

allows 100% reproductibility for optimized module

efficiencies.

An auxilliary supply is implemented to feed

independently all security functions such as the input

undervoltage lock-out (UVLO), the output overload

protection (OCP), the ouput overvoltage protection

(OVP) and the thermal protection (OTP).

The controlled feedback regulation is located at the

secondary side allowing a high regulation bandwidth

and a very fast response to load changes.

LC output

Vo

LC input

filter

Vin

POWER STAGE

filter

4

UVLO

Current

Sense

Mosfet

Driver

OVP

On/Off

Sync

Auxilliary

supply

Feed-back

function

Control circuit

Sense

Trim

Thermal

Shutdown

Isolation Barrier

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4- Electrical Specifications

Data are valid at +25°C, unless otherwise specified.

Single Output MGDS-75

Limit or

typical

Parameter

Conditions

Units

75 - H

75 - O

Input

Nominal input voltage

Full temperature range

Nominal

VDC

24

28

Permanent input

voltage range (Ui)

Min. - Max.

9 - 45

16 - 80

Undervoltage lock-out

(UVLO)

Turn-on voltage

Turn-off voltage

Nominal

VDC

8,5

7,5

15,5

14,5

Ui nominal

Start up time

Nominal output

Full load : resistive

Maximum

ms

30

Ui nominal, full load

BW = 20MHz

Reflected ripple current

Maximum

Typical

mApp

A

500

1

500

0,2

30

Input current in short circuit

mode (Average)

Ui nominal

Short-circuit

Ui nominal

No load

No load input current

Maximum

mA

30

10

Ui nominal

Inhibit

Input current in inhibit mode

Output

10

Nominal

VDC

3,3

5

12

15

24

28

3,3

5

12

15

24

28

Output voltage *

Ui min. to max.

4

Ambient temperature : +25°c

Ui nominal, 75% load

Set Point accuracy *

Output power

Maximum

%

W

+/- 2

At 105°c baseplate

Ui min. to max.

50 to 75

Output current

3,3V output

5V output

12V output

15V output

24V output

28V output

Maximum

A

15

12,5

6,25

5

3,125

2,7

15

6,25

5

3,125

2,7

Full temperature range

Ui min. to max.

Ripple output voltage

3,3V and 5V output

12V output

15V output

24V and 28V output

Ui nominal

Full load

BW = 20MHz

Typical

mVpp

50

100

150

250

100

150

250

Output regulation *

(Line + load + thermal)

Ui min. to max.

0% to full load

Maximum

%

+/- 1

Minimum

Maximum

%

90 **

110

90 **

110

Output Voltage Trim

Efficiency

As function of output voltage

Ui nominal

Full load

Typical

%

Please consult factory

Note * : These performances are measured with the sense line connected..

Note ** : It is recommended to mount the converter on a heatsink for this test, see section 10-3 and 10-9 for further details.

Note *** : The ripple output voltage is the periodic AC component imposed on the output voltage, an aperiodic and random component (noise) has also to be considered.

This noise can be reduced by adding 4 external decoupling capacitors connected between inputs and case and between outputs and case. These capacitance should

be layed-out as close as possible from the converter. Please refer to page 8 for more details.

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4- Electrical Characteristics (continued)

Typical efficiency MGDS75HB at 25°C

Typical efficiency MGDS75HC at 25°C

83%

80%

78%

75%

73%

70%

68%

65%

63%

60%

80%

78%

75%

10W

15W

30W

45W

60W

75W

73%

20W

30W

70%

40W

68%

65%

63%

60%

50W

5

10

15

20

25

30

35

40

45

5

10

15

20

25

30

35

40

45

Input voltage Vin (Vdc)

Typical efficiency MGDS75HE at 25°C

Typical efficiency MGDS75HF at 25°C

88%

86%

84%

82%

80%

78%

76%

74%

72%

70%

68%

89%

88%

87%

86%

85%

84%

83%

82%

81%

80%

79%

78%

77%

76%

75%

74%

73%

15W

30W

45W

60W

75W

15W

30W

45W

60W

75W

4

5

10

15

20

25

30

35

40

45

10

15

20

25

30

35

40

45

Input voltage Vin (Vdc)

Typical efficiency MGDS75HJ at 25°C

88%

85%

83%

80%

78%

75%

73%

70%

68%

65%

63%

60%

58%

15W

30W

45W

60W

75W

10

15

20

25

30

35

40

45

Input voltage Vin (Vdc)

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4- Electrical Characteristics (continued)

Typical efficiency MGDS75OC at 25°C

86%

85%

84%

83%

82%

81%

80%

79%

78%

77%

76%

75%

74%

73%

72%

71%

15W

30W

45W

60W

75W

10

20

30

40

50

60

70

80

Input voltage Vin (Vdc)

Typical efficiency MGDS75OE at 25°C

88%

86%

84%

82%

80%

15W

4

30W

78%

45W

76%

74%

72%

70%

68%

60W

75W

10

20

30

40

50

60

70

80

Input voltage Vin (Vdc)

Typical efficiency MGDS75OI at 25°C

Typical efficiency MGDS75OJ at 25°C

90%

88%

85%

83%

80%

78%

75%

73%

70%

68%

65%

63%

60%

90%

88%

85%

83%

80%

78%

75%

73%

70%

68%

15W

30W

45W

60W

75W

15W

30W

45W

60W

75W

10

20

30

40

50

60

70

80

10

20

30

40

50

60

70

80

Input voltage Vin (Vdc)

6

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5- Switching Frequency

Parameter

Conditions

Limit or typical

Specifications

Full temperature range

Ui min. to max.

Switching frequency

Nominal, fixed

420 KHz

No load to full load

6- Isolation

Parameter

Conditions

Limit or typical

Specifications

Input to output

Input to case

Output to case

Minimum

1.500 VDC / 1 min

Electric strength test voltage

Isolation resistance

500 VDC

Minimum

100 MOhm

7- Protection Functions

4

Characteristics

Protection Device

Recovery

Limit or typical

Specifications

Turn-on, turn-off circuit

with hysteresis cycle

Automatic

recovery

Turn-on nominal

Turn-off nominal

Input undervoltage lock-out (UVLO)

see section 4

Output current limitation protection

(OCP)

Straight line current

limitation

Automatic

recovery

110% of

output current

Nominal

Overvoltage protection

device with latch-up

Automatic

recovery

120% of

output voltage

Output overvoltage protection (OVP)

Over temperature protection (OTP)

Thermal device with

hysteresis cycle

Automatic

recovery

115°C

8- Reliability Data

Characteristics

Conditions

Temperature

Specifications

Case at 40°C

Case at 85°C

700.000 Hrs

190.000 Hrs

Ground fixed (Gf)

Mean Time Between Failure (MTBF)

According to MIL-HDBK-217F

Airborne, Inhabited,

Cargo (AIC)

Case at 40°C

Case at 85°C

390.000 Hrs

125.000 Hrs

Mean Time Between Failure (MTBF)

According to IEC-62380-TR

Avionics Military Cargo

/

Consult factory

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9- Electromagnetic Interference

Electromagnetic Interference requirements according to MIL-STD-461C/D/E standards can be easily achieved as indicated in

the following section. The following table resumes the different sections covered by these standards.

MIL-STD-461C

Standard

MIL-STD-461D/E

Standard

Compliance with GAIA Converter

Module & common mode capacitance

Standard Requirements

Conducted emission (CE) :

Low frequency

High frequency

CE 01

CE 03

CE 101

CE 102

compliant module stand-alone

compliant with additionnal filter

Conducted susceptibility (CS) :

Low frequency

High frequency

CS 01

CS 02

CS 101

CS114

compliant with additionnal filter

Radiated emission (RE) :

Magnetic field

Electrical field

RE 01

RE 02

RE 101

RE 102

compliant module stand-alone

Radiated susceptibility (RS) :

Magnetic field

Electrical field

RS 01

RS 03

RS 101

RS 103

compliant module stand-alone

Compliance Description

Applicability

See section 8-1

H, O input module

See section 8-1

H, O input module

see also EMI design notes

4

9-1 Module Compliance with MIL-STD-461C/D/E Standards

To meet MIL-STD-461D/E (and also MIL-STD-461C) requirements and in particular CE102 (and also CE03) requirements, Gaïa

Converter recommends the use of the following front filter together with 4 external decoupling capacitors connected between

inputs and case and between outputs and case. Please consult EMI filter design note for further details.

Cc

BP

LMC1

L^MC2

VI

GI

Vo

Go

C2

C3

C6

C7

R2

R1

C5

C1

C4

C8

MGDM-series

C9

BP

Cc

BP: Base Plate

LMC1, LMC2 .............. : Common mode chokes (consult EMI design note for details)

C1, C4, C8 ............. : Ceramic capacitors (consult EMI design note for details)

C2, C3, C6, C7 ........ : Ceramic capacitors 10nF

C5, C9 .................. : Optionnal electrolytic capacitors (consult EMI design note for details)

R1, R2 .................. : Optionnal resistors (consult EMI design note for details)

Cc *...................... : Common mode noise capacitor 10nF

(*) Must be placed as close as possible to the converter in order to reduce the path length or the connections to the pins and the baseplate.

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10- Thermal Characteristics

Characteristics

Conditions

Limit or typical

Performances

Operating ambient temperature range

at full load

Minimum

Maximum

- 40°C

see section 10-9

Ambient temperature *

Minimum

Maximum

- 40°C

+ 105°C

Baseplate temperature

Storage temperature range

Thermal resistance

Base plate temperature

Non functionning

Minimum

Maximum

- 55°C

+ 125°C

Baseplate to ambient

Rth(b-a) free air

Typical

11°C/W

Note * : The upper temperature range depends on configuration, the user must assure a max. baseplate temperature of + 105°C.

The MGDM-75 series maximum baseplate temperature at

full load must not exceed 105°C. Heat can be removed

from the baseplate via three basic

To calculate a maximum admissible ambient temperature

the following method can be used.

Knowing the maximum baseplate temparature Tbase =

105°C of the module, the power used Pout and the

efficiency η :

mechanisms :

• Radiation transfert : radiation is counting for less

than 5% of total heat transfert in majority of case, for

this reason the presence of radient cooling is used as

a safety margin and is not considered.

• determine the power dissipated by the module Pdiss

that should be evacuated :

Pdiss = Pout(1/η - 1) (A)

• determine the maximum ambient temperature :

Ta = 105°C - Rth(b-a) x Pdiss (B)

• Conduction transfert : in most of the applications,

heat will be conducted from the baseplate into an

attached heatsink or heat conducting member; heat is

conducted thruthe interface.

where Rth(b-a) is the thermal resistance from the

baseplate to ambient.

This thermal Rth(b-a) resistance is the summ of :

• the thermal resistance of baseplate to heatsink

(Rth(b-h)). The interface between baseplate and

heatsink can be nothing or a conducting member, a

thermal compound, a thermal pad.... The value of

Rth(b-h) can range from 0.4°C/W for no interface down

to 0.1°C/W for a thermal conductive member inter-

face.

• Convection transfert : convecting heat t r a n s f e r

into air refers to still air or forced air cooling.

4

In majority of the applications, heat will be removed from

the baseplate either with :

• heatsink,

• forced air cooling,

• both heatsink and forced air cooling.

• the thermal resistance of heatsink to ambient air

(Rth(h-a)), which is depending of air flow and given

by heatsink supplier.

The table hereafter gives some example of thermal resistance for different heat transfert configurations.

Thermal resistance baseplate to

Global

resistance

Heat transfert

Thermal resistance heatsink to air Rth(h-a)

heatsink

No need of thermal pad

Berquist Silpad* :

No Heatsink baseplate only :

Heatsink Thermaflo 424500B0000 :

Heatsink Thermaflo 424800B0000 :

No Heatsink baseplate only :

11°C/W

7,85°C/W

3,71°C/W

6,9°C/W

Free air cooling

only

7,64°C/W

3,5°C/W

6,9°C/W

3,5°C/W

2,8°C/W

4,8°C/W

2°C/W

0,21°C/W

Berquist Silpad* :

No need of thermal pad

Berquist Silpad* :

Forced air cooling

200 LFM

Heatsink Radian HS1568EX :

0,21°C/W

3,71°C/W

3,01°C/W

4,8°C/W

Heatsink Thermaflo 424800B0000 :

No Heatsink baseplate only :

Berquist Silpad* :

No need of thermal pad

Forced air cooling

400 LFM

Heatsink Radian HS1568EX :

Berquist Silpad* :

No need of thermal pad

Berquist Silpad* :

0,21°C/W

2,21°C/W

2,01°C/W

2,8°C/W

Heatsink Thermaflo 424800B0000 :

No Heatsink baseplate only :

1,80°C/W

2,8°C/W

1°C/W

Forced air cooling

1000 LFM

Heatsink Thermaflo 424800B0000 :

0,21°C/W

1,21°C/W

Radian and Thermaflo are heasink manufacturers. «Silpad» © is a registered trademark of Berquist.

Note* : Silpad performance are for Silpad 400 with pressure conditions of 50 Psi. Surface of MGDS-150 series is 3,3 inch2.

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10- Thermal Characteristics (continued)

The two formulas (A) and (B) described in previous page :

• Pdiss = Pout(1/η - 1) (A)

In particular, as example the following typical curves are

calculated with :

• no heatsink

• Ta = 105°C - Rth(b-a) x Pdiss (B)

• a Thermaflo heatsink reference 424800B0000 and a

Berquist «Silpad» for various cooling conditions.

conduct to curves determining the ambient temperature

admissible as a function of output power for various heat

transfert conditions.

MGDS-75-H-x Series Thermal Curves

75

70

65

60

55

50

45

40

35

30

25

20

15

10

5

no heatsink

no heatsink 200LFM

no heatsink 400 LFM

heatsink 1000 LFM

heatsink

heatsink 200 LFM

heatsink 400 LFM

heatsink 1000 LFM

4

0

10

20

30

40

50

60

70

80

90

100

110

Ambient temperature (°C)

MGDS-75-O-x Series Thermal Curves

75

70

65

60

55

50

45

40

35

30

25

20

15

10

5

no heatsink

no heatsink 200LFM

no heatsink 400 LFM

heatsink 1000 LFM

heatsink

heatsink 200 LFM

heatsink 400 LFM

heatsink 1000 LFM

0

10

20

30

40

50

60

70

80

90

100

110

Ambient temperature (°C)

10

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11- Environmental Qualifications

The modules have been subjected to the following environmental qualifications.

Characteristics

Conditions

Severity

Test procedure

Climatic Qualifications

Duration

Temperature / status of unit

Test D : 1.000 Hrs

@ 105°C case, unit operating

@ 125°C ambient, unit not operating

Life at high

temperature

MIL-STD-202G

Method 108A

Altitude level C

Duration

Climb up

Stabilization

Status of unit

40.000 ft@-55°C

30 min.

1.000 ft/min to 70.000 f@-55°C,

30 min.

MIL-STD-810E

Method 500.3

Altitude

unit operating

Number of cycle

10

Cycle duration

Cycle I : 24 Hrs

60 % to 88 %

31°C to 41°C

unit not operating

MIL-STD-810E

Method 507.3

Humidity cyclic

Relative humidity variation

Temperature variation

Status of unit

Damp heat

Temperature

Duration

93 % relative humidity

40°C

56 days

MIL-STD-202G

Method 103B

Humidity steady

Salt atmosphere

Status of unit

unit not operating

Temperature

Concentration NaCl

Duration

35°C

5 %

48 Hrs

MIL-STD-810E

Method 509.3

Status of unit

unit not operating

Number of cycles

Temperature change

Transfert time

Steady state time

Status of unit

200

-40°C / +85°C

40 min.

20 min.

unit operating

Temperature

cycling

MIL-STD-202A

Method 102A

4

Number of shocks

Temperature change

Transfert time

Steady state time

Status of unit

100

-55°C / +105°C

10 sec.

20 min.

MIL-STD-202G

Method 107G

Temperature shock

unit not operating

Mechanical Qualifications

Number of cycles

10 cycles in each axis

10 to 60 Hz / 0.7 mm

60 to 2000 Hz / 10 g

2h 30 min. per axis

unit not operating

Frequency / amplitude

Frequency / acceleration

Duration

Vibration

(Sinusoidal)

MIL-STD-810D

Method 514.3

Status of unit

Number of shocks

Peak acceleration

Duration

Shock form

Status of unit

3 shocks in each axis

100 g

6 ms

1/2 sinusoidal

unit not operating

Shock

(Half sinus)

MIL-STD-810D

Method 516.3

Number of bumps

Peak acceleration

Duration

2000 Bumps in each axis

40 g

6 ms

Bump

(Half sinus)

MIL-STD-810D

Method 516.3

Status of unit

unit not operating

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12- Description of Protections

The MGDM-75 series include 3 types of protection devices that

are powered and controlled by a fully independant side power

stage.

12-1 Input Undervoltage Lockout (UVLO)

12-1-1 Undervoltage Lockout (UVLO)

An undervoltage protection will inhibit the module when input

voltage drops below the lockout turn-off threshold (see sec-

tion 4 for value) and restores to normal operation automatically

when the input voltage rises the lockout turn-on threshold.

On

Off

Vin

UVLO UVLO

Turn-off Turn-on

12-2 Output Over Current Protection (OCP)

Vout

The MGDM-75 Series incorporates a staight line current limit

and protection circuit. When the output current reaches 110%

of it’s full-rated current (Icurrent limit), the output voltage

falls and output current falls along the vertical line as described

in the figure herein. The module restart automatically to nor-

mal operation when overcurrent is removed.

4

Icurrent limit

Iout

110% of full 130% of full

rated current rated current

12-3 Output Overvoltage Protection (OVP)

Each circuit has an internal overvoltage protection circuit that

monitors the voltage accross the output power terminals.

It is designed to turn the converter off at 120%

(+/-5%) of output voltage.

Once in OVP protection, the module will restart automatically

when overvoltage is removed.

12-4 Over Temperature Protection (OTP)

On

A thermal protection device adjusted at 115°C (+/-5%) internal

temperature with 10°C hysteresis cycle will inhibit the mo-

dule as long as the overheat is present and restores to nor-

mal operation automatically when overheat is removed. The

efficiency of the OTP function is warranty with the module

mounted on a heatsink.

Off

10˚c

Baseplate

Temperature

115˚c

12

Gaia Converter FC03-032.03/06 Revision G

©

For locations, phone, fax, E-Mail see back cover

Hi-Rel

Grade

MGDM-75 Series

13- Description of Functions

13-1 Trim Function

The output voltage Vo may be trimmed in a range of

90%/110% of the nominal output voltage via a single external

trimpot or fixed resistor.

Trim Up Function

4

Do not attempt to trim the module higher than 110% of

nominal output voltage as the overvoltage protection may

occur.

5

6

Vin

Vo

S+

MGDM75

3

On/Off

Ru

Error amp.

R1

Also do not exceed the maximum rated output power when

the module is trimmed up.

The trim up resistor must be connected to S+ pin.

The trim up resistance must be calculated with the following

formula :

Trim 7

Load

R2

Vref=

2.5V

1µF

2

1

Sync

Gin

S-

8

9

Go

Ru = R1 (V0-Vref)V0nom - R1 - R2

(V0-V0nom)Vref

Trim Down Function

4

3

5

6

Vin

Vo

S+

Do not trim down more than -10% of nominal output vol-

tage.

MGDM75

On/Off

The available output power is reduced by the same

percentage that output voltage is trimmed down.

The trim down resistor must be connected to S- pin.

The trim down resistance must be calculated with the

following formula :

Error amp.

R1

Trim 7

Load

4

R2

Rd

Vref=

2.5V

1µF

2

1

Sync

Gin

S-

8

9

Go

Rd = (R2 + R1)V0- R2V0nom

V0nom - V0

4

3

Trim via a voltage

5

Vin

Vo

S+

MGDM75

The output voltage is given by the following formula :

6

On/Off

V0 = 1 +

R1 (Vtrim - 1)

(R1 + R2) Vref

Ru

Error amp.

R1

100nF

Trim 7

Load

R2

BAT54

Vref=

2.5V

1µF

Vcontrol

2

1

S-

8

9

Sync

Gin

Go

Parameter

Unit

Vdc

Min.

Typ.

2,5

Max.

Trim reference

Resistor R1

Resistor R2

Trim capacitor

2,45

2,55

Ohm

µF

/

3800

270

1

/

13

Gaia Converter FC03-032.03/06 Revision G

©

For locations, phone, fax, E-Mail see back cover

Hi-Rel

Grade

MGDM-75 Series

13- Description of Functions (continued)

13-2 Sense Function

If the load is separated from the output by any line lenght,

some of these performance characteristics will be degraded

at the load terminals by an amount proportional to the

impedance of the load leads. Sense connections enable to

compensate the line drop at a maximum of +/-10% of output

voltage. The overvoltage protection will be activated and module

will shut down if remote sense tries to boost output voltage

above 110% of nominal output voltage. Connection is described

in figure herein.

4

5

Vin

Vo

MGDM75

6

S+

3

On/Off

Trim 7

Load

2

Sync

S-

8

9

1

Gin

Go

13-3 On/Off Function

The control pin 3 (On/Off) can be used for applications requiring

On/Off operation. This may be done with an open collector

transistor, a switch, a relay or an optocoupler. Several

converters may be disabled with a single switch by connecting

all

BP

4

5

6

Vin

Vo

S+

Vi

3

On/Off

7

Trim

MGDM75

Load

On/Off pins together.

On/Off

2

• The converter is disabled by pulling low the pin 3.

• No connection or high impedance on pin 4 enables the

converter.

8

9

Sync

S-

1

Gi

Gin

Go

By releasing the On/Off function, the converter will restart

within the start up time specifications given in table section

3. For further details please consult ‘’Logic On/Off’’ application note.

4

Parameter

Unit

Vdc

Min.

Typ.

Max.

4,5

Notes, conditions

On/Off module enable voltage

On/Off module disable voltage

2

0

/

Open, the switch must not sink more than 100µA

The switch must be able to sink 1mA

Vdc

0.5

The module restarts with the same delay after alarm mode

removed

On/Off module enable delay

On/Off module disable delay

ms

µs

/

30

100

Vi nominal, full load

13-4 Synchronization Function

An external clock with rectangular «Pull Up» signals can be

used to lock one or more converters. The external clock si-

gnal should have a frequency range from 860KHz to 940KHz,

a low level below 0,5V a high level of 4V (+/-0.5V), a rise

time of 30 ns max. and a drop time of 100ns max..

BP

4

5

6

Vin

Vo

Vi

3

S+

On/Off

100pF

7

Trim

MGDM75

Load

Ext. clock

2

1

Totem pole

output

8

9

Sync

Gin

Vsync

S-

4.7k

1N4148

Gi

Go

4V

+/- 0,5

0V

Vin

30ns

max

T/2

100ns

max

T

( 860Khz < F < 940Khz )

14

Gaia Converter FC03-032.03/06 Revision G

©

For locations, phone, fax, E-Mail see back cover

Hi-Rel

Grade

MGDM-75 Series

14- Application Notes

14-1 Synchronization of Modules

The MGDM-75 series provides a synchronization function

trough the pin 2 (Synchro) to enable automatic synchroni-

sation between several converters.

If several converters are used, they lock themselves into

the highest switching frequency.

The synchronization signal available on pin 2 is referenced

to ground in (Gi) and the signal shape is the double of the

switching frequency (i.e 2x420KHz). It is a rectangular

signal with 3.5 Vp (+/-0.5V) amplitude with an impedance

of 4,7 KOhm on low level.

10nF

BP

4

5

6

Vin

Vo

S+

3

On/Off

7

Trim

MGDM75

2

8

9

Sync

S-

1

Gin

Go

BP

10nF

(*)

10nF

BP

4

5

6

Vin

Vo

S+

3

On/Off

7

Trim

MGDM75

On/Off

2

8

9

Sync

S-

1

Gin

Go

BP

10nF

(*)BP: Base Plate

4

14-2 Connection of Modules in Series

10nF

4

The output of single output units can be connected in

series without any precautions to provide higher output

voltage level.

BP

5

6

Vin

Vo

S+

3

On/Off

Nevertheless, GAIA Converter recommends to protect each

individual output by a low power shottky diode rated with

the maximum current of the converter to avoid reverse

polarity at any output.

Reverse polarity may occur at start up if the output volta-

ges do not rise at the same time.

100µF

7

Trim

MGDM75

2

1

8

9

Sync

Gin

S-

Go

BP

10nF

(*)

10nF

4

BP

MGDM75

BP

5

6

Vin

Vo

S+

3

On/Off

100µF

7

Trim

2

1

8

9

Sync

Gin

S-

Go

10nF

(*)BP: Base Plate

15

Gaia Converter FC03-032.03/06 Revision G

©

For locations, phone, fax, E-Mail see back cover

Hi-Rel

Grade

MGDM-75 Series

11- Dimensions

Dimensions are given in mm (inches). Tolerance : +/- 0,2 mm (+/- 0.01 “) unless otherwise indicated.

Weight : 70 grams (1.95 Ozs) max.

Mouting Hole

0 3,1 (0.122)

0.5 (0,019)

10,795

(0.425)

9,894

(0.39)

Uncoated

metal header

Use this side

for heat sinking

5.6 min

(0,22)

26,16 (1.03)

36,83 (1.45)

R2,4 (0.1)

CH 2x2

6.8 max

(0,267)

12.7 Max

(0,5)

4

Pin dimensions :

Pin 1, 2, 3, 4, 7, 8 :

Ø 1 mm (0.04”)

Pin 5, 9 :

Ø 1,5 mm (0.059”)

12- Product marking

Side face : Company logo, module reference,

Date code : year and week of manufacturing

13- Connections

9

8

7

6

5

1

Single Output

- Input (Gi)

2

Synchro (Sync)

On/Off

3

4

+ Input (Vi)

+ Output (Vo)

Sense + (S+)

Trim(Trim)

Sense - (S-)

- Output (Go)

5

6

7

8

9

1

2

3

4

Bottom view

16

Gaia Converter FC03-032.03/06 Revision G

©

For locations, phone, fax, E-Mail see back cover

For more detailed specifications and applications information, contact :

International Headquarters

Marketing and Sales department

GAÏA Converter - France

North American Headquarters

GAÏA Converter Canada, Inc

Address : 6611 Thissen

Address : B.P. 26 - 33186 LE HAILLAN - FRANCE

Tel. : + (33)-5-57-92-12-80

ST-LAURENT, QUEBEC - CANADA H4S 1W2

Tel. : (514)-333-3169

Fax : + (33)-5-57-92-12-89

Fax : (514)-333-4519

Represented by :

Information given in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed for the consequence of its use nor for any infringement of patents or other rights of third parties which may result from its use.

These products are sold only according to GAIA Converter general conditions of sale, unless otherwise confirmed by writing. Specifications subject to change without notice.


型号：	MGDM-75
厂家：	ETC
描述：	Hi-Rel DC/DC CONVERTER 75W POWER 高可靠性DC / DC转换器功率75W 转换器
文件：	总17页 (文件大小：618K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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