Diotec Semiconductor AG

  

79423 Heitersheim 

Tel.: +49-7634-5266-0  

mail@diotec.com 

Kreuzmattenstr. 4 

Germany 

Fax: +49-7634-5266-61 

www.diotec.com

 

Version 2005-07-26 

Diotec 

Products  

 for 

Power Supplies

 

 
Typical Applications:  
AC/DC-, DC/DC-Converters, Battery Chargers, Off-Line PS

 

 
 
 
 
 
 
 
 
 

 
 

Line Protection 

Î

 TVS-Diodes

 

 

Input Rectification  

Î

 Bridge 

Rectifiers, 

  

 

Standard-/Fast Rectifiers

 

 

Voltage Regulation 

Î

 Zener 

Diodes 

 

Boost-Diode for PFC 

Î

 Superfast-/Ultrafast 

Rectifiers 

 
Gate Protection (MOS) 

Î

 Zener-Diodes, 

TVS-Diodes

 

 

Clamping Network (Flyback) 

Î

 Fast-Diodes,TVS-Diodes

 

 

Demagnetization (Forward) 

Î

 Fast-Diodes

 

 

Output Rectification 

Î

 Schottky 

Diodes, 

  

 

Superfast-/Ultrafast Rectifiers

 

 
OR-ing Diodes 

Î

 

Schottky Diodes,   

  

 

Standard Rectifiers

 

 

 

 
 

 

 
Diotec Products for 

Power Supplies

 

www.diotec.com

 07/2005 

Input Rectification (Front End) 

 
 
 
 
 
 
 
 
 
 
 

TVS-Diodes 

AC side: protect the whole unit against voltage spikes from the mains, caused by lightning, electrostatic 
discharge (ESD), fast switching transients, etc. 
DC side: protect the rectifier bridge against voltage spikes caused by fast switching transients of the 
following inverter stage 
Dimensioning: the maximum occuring peak input voltage resp. the DC voltage must not exceed the stand-off 
voltage of the device; it may be necessary to switch devices in series to achieve higher voltage rating. 
 

Types

1

 

Leaded: BZW04-…, 

P4KE…

, BZW06-…, 

P6KE…

, 

1.5KE…

 , 5KP…; (400 to 5000 W) 

SMD: 

TGL34-…

 

, TGL41-…,

 

P4SMA…,  P6SMB…, 1.5SMC… ;

 (150 to 1500 W, 

up to 550V!

) 

 

 

Bridge Rectifiers 

Available as complete device but can also be formed by four single devices. Recommended values for 
protective resistor R

t

 and load capacitor C

L

 are given within the datasheet. R

t

 includes also series resistance 

of transformer and leads, at small powers an additional device is therefore often not necessary. 
 

Types

1

 

Small power (0.5 to 1 A) 
SMD: 

MYS40…380,

 

MS40…500, S40…500, B40…500S

, B40…380FS (Fast), CS10…50S (Schottky) 

trough hole: 

B40…500D

,  B40…380FD (Fast recovery), CS10…50D (Schottky) 

 
Medium Power (1.5 to 25 A) 
Single In-line: B..C1500, 

B..C2300-1500

; GBS4 A…M; 

B..C3200-2200 to B..C7000-4000;

 GBS4 

 

GBU4 to GBU12; KBU4 to KBU12; 

GBI10 A…M to GBI25 A…M 

Square with wire leads: KBPC600, KBPC800, PB1000, PB1000S 
 
High Power (10 to 50 A) 
Square, Fast-on terminals: KBPC1000FP,

  KBPC1500FP to KBPC5000FP

 

Square, Wire leads: KBPC1000WP,

  KBPC1500WP to KBPC5000WP, 

KBPC2500I to KBPC3500I 

 
3~ Bridges (6 to 35 A) 
Single In-line: DBI 6-… to DBI 25-… 
Square, Fast-on terminals: 

DB15-… to DB35-… 

 

                                                

1

 Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”. 

R

t

 

~

+

~

-

C

L

 

 

 
 

 

 
Diotec Products for 

Power Supplies

 

www.diotec.com

 07/2005 

Single Rectifiers 1200 V to 24 kV 

EMI tests using burst pulses up to 2 kV are a big challenge for rectifiers used in 230 V power supplies. 
Instead of switching two devices in series, single rectifiers having 1200 to 2000 V can be used.  
Special high voltage rectifiers allow usage at medium to high voltages. 
 

Types

1

 

Leaded: 

EM513…EM518, BY255…BY2000, P600S; 

(1 to 6 A; 1200 to 2000 V) 

 

BV4…6, BY4…16; 

(0.1 to 1 A; 4 to 16 kV) 

 

H

H

V

V

1

1

.

.

5

5

,

,

 

 

H

H

V

V

2

2

 

 

(

(

5

5

0

0

0

0

 

 

m

m

A

A

,

,

 

 

1

1

.

.

5

5

 

 

t

t

o

o

 

 

2

2

 

 

k

k

V

V

 

 

F

F

a

a

s

s

t

t

)

)

;

;

 

 

H

H

V

V

3

3

,

,

 

 

H

H

V

V

5

5

 

 

(

(

2

2

0

0

0

0

 

 

m

m

A

A

,

,

 

 

3

3

 

 

t

t

o

o

 

 

5

5

 

 

k

k

V

V

 

 

F

F

a

a

s

s

t

t

)

)

 

 

 

 

 

 

D

D

D

D

3

3

0

0

0

0

 

 

…

…

 

 

D

D

D

D

1

1

8

8

0

0

0

0

 

 

(

(

2

2

0

0

 

 

m

m

A

A

,

,

 

 

3

3

k

k

V

V

 

 

t

t

o

o

 

 

1

1

8

8

 

 

k

k

V

V

 

 

F

F

a

a

s

s

t

t

)

)

 

SMD:  

SM513…SM2000, S1T…S1Y, S2T…S2Y, S3T…S3Y;

 

S

S

A

A

2

2

6

6

1

1

…

…

S

S

A

A

2

2

6

6

5

5

 

 

(

(

F

F

a

a

s

s

t

t

)

)

;

;

 

 

(1 to 3 A) 

Special package “Hockey Puck“

2

:  

Si-A1125/500-6, Si-A3000/1350-2.5, Si-A7500/3300-3.2, Si-A8000/3600-1.8;

 (7.7 to 1.8 A; 3.2 to 24 kV) 

 
 
 
 

Power Factor Correction (PFC) 

 
 
 
 
 
 
 

 

Ultrafast Diodes

 for boost stage 

Operation frequencies are normally high, for reduction of power losses in the switch (affected highly by 
reverse recovery behaviour of the diode!) the boost diode must be ultrafast. At 230 V

RMS

 mains, minimum a   

600 V type should be used, at 110 V

RMS

 a 400 V type.  

 

Types

1

 

Leaded: 

UF4004…4007

, 

UF5404…5408

, UF600G…M; (1 to 6 A) 

SMD: 

SUF4004…4007

, US1G…M, US2G…M, US3G…M; (1 to 3 A) 

 

 

Zenerdiodes

/

TVS-Diodes

 for Gate protection 

To provide protection against both negative and positive voltage spikes two zener diodes can be switched in 
series or a 

single bidirectional TVS-diode

 (Suffix “B” or “C”) can be used. 

 

Types

1

 

Leaded: 

 ZPY…, 

ZY…,

 3EZ…, 

1N53..B; (1.3 to 5 W steady)

 

 

BZW04-…B, 

P4KE…C,

 BZW06-…B, 

P6KE…C

, 

1.5KE…C

, 5KP…C; (400 to 5000 W peak) 

SMD:  

ZMM…, 

ZMD…

, ZMY..., 

SMZ1...,

 SZ3C…, 

Z1SMA, Z2SMB…, Z3SMC…;

 (0.5 to 3 W steady) 

 

TGL34-…C, TGL41-…C

, 

P4SMA…C, P6SMB…C, 1.5SMC…C

 (150 to 1500 W peak) 

 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”.

 

2

 

On request

 

 

 

 
 

 

 
Diotec Products for 

Power Supplies

 

www.diotec.com

 07/2005 

Flyback Converter 

 
 
 
 
 
 
 
 
 
 
 
 

Clamping Network: 

TVS-/

F

F

a

a

s

s

t

t

-Diode 

Necessary for three reasons: Leakage inductance of the transformer causes voltage spikes during turn-off of 
the switch. Current commutation from primary to secondary side needs a small time during that voltage 
across the switch is rising to high levels. If output voltage is not controlled and there is no load at the output, 
voltage may increase until rectifier diode breaks down.  

 

Types

1

 

Leaded:  

BZW04-…, 

P4KE…,

 BZW06-…, 

P6KE…

, 

1.5KE…

 , 5KP…; (400 to 5000 W)

 

 

B

B

A

A

1

1

5

5

7

7

…

…

1

1

5

5

9

9

,

,

 

 

B

B

Y

Y

3

3

9

9

6

6

…

…

B

B

Y

Y

3

3

9

9

9

9

,

,

 

 

B

B

Y

Y

5

5

0

0

0

0

-

-

…

…

,

,

 

 

M

M

R

R

8

8

2

2

0

0

…

…

8

8

2

2

8

8

;

;

 

 

(

(

1

1

 

 

t

t

o

o

 

 

5

5

 

 

A

A

)

)

 

 

SMD:  

TGL34-… ,

 

TGL41-…,

 

P4SMA…,  P6SMB…, 1.5SMC…;

 (150 to 1500 W, 

up to 550 V!

) 

 

R

R

G

G

L

L

3

3

4

4

…

…

,

,

 

 

R

R

G

G

L

L

1

1

…

…

,

,

 

 

S

S

A

A

1

1

5

5

4

4

…

…

1

1

6

6

0

0

,

,

 

 

S

S

A

A

2

2

6

6

3

3

…

…

2

2

6

6

5

5

 

 

(

(

2

2

0

0

0

0

0

0

 

 

V

V

!

!

)

)

;

;

 

 

F

F

R

R

1

1

…

…

,

,

 

 

F

F

R

R

2

2

…

…

,

,

 

 

F

F

R

R

3

3

…

…

;

;

 

 

(

(

0

0

.

.

5

5

 

 

t

t

o

o

 

 

3

3

 

 

A

A

)

)

 

 

 
 

Zenerdiodes

/

TVS-Diodes

 for Gate protection 

To provide protection against both negative and positive voltage spikes two zener diodes can be switched in 
series or a 

single bidirectional TVS-diode

 (Suffix “B” or “C”) can be used. 

 

Types

1

 

Leaded:  

ZPY…, 

ZY…,

 3EZ…, BZV58C…, 

1N53..B; (1.3 to 5 W steady)

 

 

BZW04-…B, 

P4KE…C,

 BZW06-…B, 

P6KE…C

, 

1.5KE…C

, 5KP…C; (400 to 5000 W peak) 

SMD:    

ZMM…, 

ZMD…

, ZMY..., 

SMZ1...,

 SZ3C…, Z1SMA, Z2SMB…, Z3SMC…; (0.5 to 3 W steady) 

 

TGL34-…C, TGL41-…C,

 

P4SMA…C, P6SMB…C, 1.5SMC… C;

 (150 to 1500 W peak) 

 

 

Output Rectification: 

Ultrafast

 

or 

Schottky 

Diodes

 

Depending on output voltage either ultrafast (50…1000 V) or Schottky diodes (20…100 V) can be used. 
Blocking voltage must be larger than twice the output DC voltage! 

 

Types

1

 

Leaded:  

UF4001…4007

, 

UF5400…5408

, UF600A…M; (1 to 6 A)

 

 

SB120…1100

, 

SB220…2100, SB320…3100, SB520…5100, SB820…8100; 

(1 to 

8 A!

) 

SMD:  

EGL34A…G, EGL1A…G,

 

SUF4001…4007

, 

US1A…M, US2A…A, US3A…A;

 (0.5 to 3 A) 

 

SGL34-20…100, SGL1-20…100, SMS120…1100, SMS220…2100

, 

SMS320…3100,  

 

SK12…110, SK32SMA…310SMA, SK52…510, SK82…810;

 (0.5 to 

8 A

!)

 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”.

 

Available as single device on request

 

 

 

 
 

 

 
Diotec Products for 

Power Supplies

 

www.diotec.com

 07/2005 

Forward Converter

 

 
 
 
 
 
 
 
 
 
 
 
 
 

Zenerdiodes

/

TVS-Diodes

 for Gate protection 

To provide protection against both negative and positive voltage spikes two zener diodes can be switched in 
series or a 

single bidirectional TVS-diode

 (Suffix “B” or “C”) can be used. 

 

Types

1

 

Leaded:  

ZPY…, 

ZY…,

 3EZ…, BZV58C…, 

1N53..B; (1.3 to 5 W steady)

 

 

BZW04-…B, 

P4KE…C,

 BZW06-…B, 

P6KE…C

, 

1.5KE…C

, 5KP…C; (400 to 5000 W peak) 

SMD:  

 ZMM…, 

ZMD…

, ZMY..., 

SMZ1...,

 SZ3C…, Z1SMA, Z2SMB…, Z3SMC…; (0.5 to 3 W steady)

 

 

TGL34-…C, TGL41-…C,

 P4SMA…C, P6SMB…C, 1.5SMC… C; (150 to 1500 W peak) 

 

 

F

F

a

a

s

s

t

t

 

 

D

D

i

i

o

o

d

d

e

e

s

s

 for transformer demagnetization 

During turn-off phase of switch the stored inductive energy within the transformer is fed back to the input 
voltage source. 
 

T

T

y

y

p

p

e

e

s

s

1

1

 

 

Leaded:  

BA157…159

, 

BY396…BY399

, 

BY500-…,

 MR820…828;

 (1 to 5 A)

 

SMD:  

RGL34…, RGL1…, SA154…160

, SA263…SA265 (

2000 V!

); 

FR1…, FR2…, FR3…;

 (0.5 to 3 A) 

 
 

Output Rectification: 

Ultrafast

 

or 

Schottky 

Diodes

 

Depending on output voltage either ultrafast (50…1000 V) or Schottky diodes (20…100 V) can be used.  

 

Types

1

 

Leaded:  

UF4001…4007

, 

UF5400…5408

, UF600A…M; (1 to 6 A)

 

 

SB120…1100

, 

SB220…2100, SB320…3100, SB520…5100, SB820…8100; 

(1 to 

8 A!

) 

SMD:  

EGL34A…G, EGL1A…G,

 

SUF4001…4007

, 

US1A…M, US2A…A, US3A…A;

 (0.5 to 3 A) 

 

SGL34-20…100, SGL1-20…100, SMS120…1100, SMS220…2100

, 

SMS320…3100,  

 

SK12…110, SK32SMA…310SMA, SK52…510, SK82…810;

 (0.5 to 

8 A

!) 

 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”.

 

 

 

 
 

 

 
Diotec Products for 

Power Supplies

 

www.diotec.com

 07/2005 

Voltage Regulation 

 
 
 
 
 
 

 

Zenerdiodes 

for simple voltage regulation 

A simple method to provide stabilized voltages from an unregulated voltage source. The resistor has to be 
choosen so that maximum allowable zener current I

Zmax

 (see datasheet) at the maximum occuring input 

voltage and at no load at the output is not exceeded. If voltage source is formed by a transformer, the series 
resistance of the windings may be enough to provide this resistor. Power dissipation of below devices ranges 
up to 5 W (leaded) and 3 W (SMD) respectively. For higher power needs series connection of zenerdiodes 
can be used. 
Tolerance is graded to E24 standard (approximately +/- 5%), if tighter limits are required parts with  
+/- 2% tolerance are available on request.  

 

Types

1

 

Leaded:  ZPY…, 

ZY…,

 3EZ…, 

1N53..B; (1.3 to 5 W)

 

SMD:  

ZMM…, 

ZMD…

, ZMY..., 

SMZ1...,

 SZ3C…, 

Z1SMA, Z2SMB…, Z3SMC…;

 (0.5 to 3 W) 

 

 

OR-ing Diodes

 

 
 
 
 
 
 
 
 
 
 
 
 

 

Decoupling of voltage sources: 

Standard 

or 

Schottky

 Diodes

 

If low power losses are required and DC voltage is below 100 V Schottky diodes can be used. Special diodes 
(on request) offer beside 

low forward voltage drop

 also 

low leakage currents

. Standard diodes are suitable 

for higher voltages, for high current applications the usage of press-fit packages is possible. The D30V.. 
series is a 

common cathode configuration

 of standard diodes within a square bridge package. 

 

Types

1

 

Leaded: 

 

1N4001…7, 1N5391…99, 

1N5400K…08K,

 

1N5400…08

, 

BY251…55

, 

BY550-…,

 

 

P600…,

 

P1000…, P1200…;

 (1 to 12 A) 

 

SB120…1100

, 

SB220…2100, SB320…3100, SB520…5100, SB820…8100;

 (1 to 

8 A

!) 

SMD:  

GL34…,

 

GL1…,

 

SM4001…7

, SM5059…63, SM5400…08, 

S1…, S2…, S3…, S5…;

 (0.5 to 5 A) 

 

SMS120…1100, SMS220…2100, SMS320…3100, SK12…110, SK32SMA…310SMA,  

 SK52…510, 

SK82…810; 

(

1 to

 8 A!) 

Pressfit:  

BYP25…, BYP35…, BYP60…, KYW25…, KYW35…, KYZ25…, KYZ35…; (25 to 60 A) 

Square with Fast-on or Wire leads: 

D30VC20…80; (2x15 A) 

                                                

1

 

Preferred types are 

bold

; colours according to Diotec Selection Guide. Datasheets see www.diotec.com, “Products”.

 

Unregulated 
DC voltage 

Regulated 
DC voltage 

DC 

Source  

1

DC 

Source  

2