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1 GENERAL DESCRIPTION

Theregulatorisageneralpurpose24VDCto13.2V

DC regulator, e.g. to be used for supply of VHF

radiotelephones.

The regulator is a serial regulator with excellent

noise performance.

1.1 TECHNICAL DATA

TheregulatoriscontrolledfromtheconnectedVHF

unit by the on/off button.

Input Voltage 21.6 to 31.2V DC

Output Voltage 13.2V DC

Output Current Max. 8A DC

Operation Temperature

Range 15°C to +55°C

Fuse 8 Amp. 5 x 20mm

Current from on/off

Terminal Less than 15 mA DC

1.2 PRINCIPLE OF OPERATION

Theregulatorisalinearserialregulatorwheremost

of the loss is dissipated in resistors. It is provided

with a terminal for remote shut-down. If the on/off

terminalisconnectedto the -terminal, theregulator

is on. If the on/off terminal is disconnected, the

regulator is off.

1.3 CIRCUIT DESCRIPTION

The output voltage is regulated by the integrated

voltageregulatorIC1.Theoutputvoltageis12VDC

plus the forward voltage over diodes D5 and D6:

approx. 13.2V DC in total if T4 is conducting. If the

outputvoltagedropsthecurrentthroughIC1andR5

increases. An increase in voltage across R5 will

result in an increase in current in T1 and the resis-

torsR10- R23resultinginan increaseinthe output

current. T1 delivers most of the output current and

FC1 only a small driver current.

If the input voltage is low and the output current is

high, the voltage across R10 -R23 results in T1

going into saturation. The voltage across R4 in-

creasesandwhenthevoltageacrossR4andVBE Of

T1 is greater than approx. 1 Volt, T3 starts to

conduct base current to T1. This transistor then

shuntstheremainingcurrent to the output,bypass-

ing R10 - R23.

COMPONENT LOCATION

View from component side with upper side tracks.

PCB rev. 24613G View from component side with lower side tracks.

R10

R11

R12

R13

R14

R15

R16

R23

R22

R21

R20

R19

R18

R17

IC1

B-T2

E-T2

E-T1

C-T1

B-T1 E-T2

C-T2

R10

R11

R12

R13

R14

R15

R16

R23

R22

R21

R20

R19

R18

R17

IC1

B-T2

E-T2

E-T1

C-T1

B-T1 E-T2

C-T2

When the input voltage and the output current are

high,T1isnearlysaturated.Whentheinputvoltage

islowandtheoutputcurrentishigh,theresistorsR1

- R3 will result in saturation of both T1 and T2. The

combination of T1 in saturation and T2 delivering

the remaining output current divides the total loss,

sothemain loss is in the resistors giving low loss in

thesemi-conductorsanda lower junction tempera-

ture, resulting in a higher reliability for the whole

regulator.

T4isusedtoswitchtheregulatorONandOFF.Ifthe

ON/OFF input is disconnected T4 is OFF and the

basecurrentstoT1 andT2 arezero andthe current

throughIC1willalsobereducedtozero.Thestand-

by current consumption is then less than 10 micro

amp.IftheON/OFFinputisconnectedto-input,T4

goes into saturation and the regulator starts.

In case of a short-circuit over the output R5 and D3

limitsthecurrentthroughIC1andT4toapprox.250

mAandR1-R3andD3limitsthecurrentthroughT1

and T2 to approx. 15 Amp. The temperature of the

1.4 PARTS LIST

REGULATOR ECI A/S 5-0-24613G 600416

POSITION DESCRIPTION MANUFACTOR TYPE PART NO.

C1 CAPACITOR ELECTROLYTIC 47uF -10/+50% 63V ERO EB 00 FL 247 J 14.552

C2 CAPACITOR MKT 0.22uF 10% 63V ERO MKT1818 11.090

C3 CAPACITOR MKT 0.22uF 10% 63V ERO MKT1818 11.090

C4 CAPACITOR ELECTROLYTIC 47uF -10/+50% 63V ERO EB 00 FL 247 J 14.552

C5 CAPACITOR MKT 100nF 10% 100VDC PHILIPS 2222 371 28104 11.180

D1 DIODE MOTOROLA MR750 25.219

D2 DIODE SCHOTTKY THOMSON-CSF BAT43 27.600

D3 DIODE ZENER PHILIPS BZX79C7V5 26.539

D5 DIODE 1N4148 HIGH SPEED PHILIPS 1N4148-143 25.131

D6 DIODE 1N4148 HIGH SPEED PHILIPS 1N4148-143 25.131

F1 FUSE 8AF 250V Ø5x20mm ELU 171 100 8AF 45.561

IC1 VOLTAGE REGULATOR +12V MOTOROLA MC7812CT 31.260

R1 RESISTOR POWER 1R0 OHM 10% 6.5W VITROHM 1R0 10% TYPE 296-0 05.725

R2 RESISTOR POWER 1R0 OHM 10% 6.5W VITROHM 1R0 10% TYPE 296-0 05.725

R3 RESISTOR POWER 1R0 OHM 10% 6.5W VITROHM 1R0 10% TYPE 296-0 05.725

R4 RESISTOR 47 OHM 5% 0.6W BEYSCHLAG MBB 0207-00-BX-47R 03.167

R5 RESISTOR PMF 27 OHM 5% 3W PHILIPS 2322 195 13279 04.660

R6 RESISTOR MF 1k0 OHM 5% 0.4W PHILIPS 2322 181 53102 01.200

R7 RESISTOR MF 1k0 OHM 5% 0.4W PHILIPS 2322 181 53102 01.200

R8 RESISTOR MF 10k OHM 5% 0.4W PHILIPS 2322 181 53103 01.225

R9 RESISTOR 2.2 KOHM 5% 0.6W DRALORIC SMA 0207 STK100-2K 03.208

R10 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R11 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R12 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R13 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R14 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R15 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R16 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R17 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R18 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R19 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R20 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R21 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R22 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

R23 RESISTOR POWER 6R8 OHM 10% 6.5W VITROHM 6R8 10% TYPE 296-0 05.730

T1 TRANSISTOR DARLINGTON TEXAS MJ2501 29.235

T2 TRANSISTOR DARLINGTON TEXAS MJ2501 29.235

T3 TRANSISTOR AF BC547B NPN TO-92 PHILIPS BC547B 28.067

T4 TRANSISTOR BD140-10 AEG BD140-10 29.066

DIAGRAM

This diagram is valid for PCB rev. 24613G

140mm

7.5mm 7.5mm

90mm

7.5mm 7.5mm

105mm

155mm

25332A

4 pcs. ø3.5mm

78mm

DIMENSION AND DRILLING PLAN

The regulator must only be mounted vertically.

Free distance must be kept to allow circulation.

coolingsurfacewillincreaseandactivatethethermal

protection circuit inside IC1 and lower the output

voltage, even though a short-circuit of the output

should be avoided.

The diode D1 protects against reverse input volt-

age. A fuse will blow in case of reverse input.

TECHNICAL MANUAL

FOR

24V/12V REGULATOR

N420

Doc. No.: M420GB Issue: D/0339

1 GENERAL DESCRIPTION

Theregulatorisageneralpurpose24VDCto13.2V

DC regulator, e.g. to be used for supply of VHF

radiotelephones.

The regulator is a serial regulator with excellent

noise performance.

1.1 TECHNICAL DATA

Theregulatoris controlledfromthe connectedVHF

unit by the on/off button.

Input Voltage 21.6 to 31.2V DC

Output Voltage 13.2V DC

Output Current Max. 8A DC

Operation Temperature

Range 15°C to +55°C

Fuse 8 Amp. 5 x 20mm

Current from on/off

Terminal Less than 15 mA DC

1.2 PRINCIPLE OF OPERATION

Theregulatorisa linear serialregulatorwheremost

of the loss is dissipated in resistors. It is provided

with a terminal for remote shut-down. If the on/off

terminalis connected to the -terminal, the regulator

is on. If the on/off terminal is disconnected, the

regulator is off.

1.3 CIRCUIT DESCRIPTION

The output voltage is regulated by the integrated

voltageregulatorIC1.Theoutputvoltageis 12V DC

plus the forward voltage over diodes D5 and D6:

approx. 13.2V DC in total if T4 is conducting. If the

outputvoltagedropsthecurrentthroughIC1andR5

increases. An increase in voltage across R5 will

result in an increase in current in T1 and the resis-

torsR10 -R23 resultingin anincrease inthe output

current. T1 delivers most of the output current and

FC1 only a small driver current.

If the input voltage is low and the output current is

high, the voltage across R10 -R23 results in T1

going into saturation. The voltage across R4 in-

creasesandwhenthevoltageacrossR4andVBE Of

T1 is greater than approx. 1 Volt, T3 starts to

conduct base current to T1. This transistor then

shuntsthe remaining current to the output, bypass-

ing R10 - R23.

COMPONENT LOCATION

View from component side with upper side tracks.

PCB rev. 24613G View from component side with lower side tracks.

R10

R11

R12

R13

R14

R15

R16

R23

R22

R21

R20

R19

R18

R17

IC1

B-T2

E-T2

E-T1

C-T1

B-T1 E-T2

C-T2

R10

R11

R12

R13

R14

R15

R16

R23

R22

R21

R20

R19

R18

R17

IC1

B-T2

E-T2

E-T1

C-T1

B-T1 E-T2

C-T2

When the input voltage and the output current are

high,T1isnearly saturated. Whentheinput voltage

islowandtheoutputcurrentishigh,theresistorsR1

- R3 will result in saturation of both T1 and T2. The

combination of T1 in saturation and T2 delivering

the remaining output current divides the total loss,

sothe main lossis in theresistors giving low loss in

thesemi-conductors and alower junction tempera-

ture, resulting in a higher reliability for the whole

regulator.

T4isusedtoswitchtheregulatorONandOFF.Ifthe

ON/OFF input is disconnected T4 is OFF and the

basecurrentsto T1andT2 arezero and thecurrent

throughIC1willalso be reducedtozero.The stand-

by current consumption is then less than 10 micro

amp.Ifthe ON/OFF inputisconnected to -input,T4

goes into saturation and the regulator starts.

In case of a short-circuit over the output R5 and D3

limitsthecurrent through IC1and T4 toapprox.250