s-400-12_supply.pdf

S-400-12 (12V 33A) Supply schematic Traced 27/10/15

RT1

PE

BD1 RS807

3u3 400V

C6

C1 2n2 Y1

R2 150k

2n2 Y1

C2 680u 250V

5D-15

V-

C17 4n7

R26

VCC D7 PE

V+

R14

R20

390k D8

R13

Q4 FJP13009

1R

C5 1n

PE 2k7

1N4007 1N4007

+

R3 150k

TR1

R11 1k5

C3

+

12R

DB2 STPS30H100C

D6 FR157

R16 330R

R41 3k9

100n

3

C13

2

V+

12R

C21

R1 680k

+

C4

R25

C10

6.3A/250V 220n 275V X2

C20 4n7

C22

4

+ 3300u 16V + 3300u 16V + 3300u 16V

1 LF1

R5 150R R6 150R R7 150R

F1

9 8 7 6 5 4 3 2 1

AC/L AC/N FG VVVV+ V+ V+

DB1 STPS30H100C

TR2

SW1

CON1

C12

Input filter and HV DC supply

LED1

V-

TXFR_MAIN

L1

1

C14 4u7 50V

J1 3m9 J4 3m9 J7 3m9

2

14.5uH 2.2mR

680u 250V

C7 V10n

PE

Voltage sense

R4

Fan supply + thermal switch

D9

D3 FR157

Q1 FJP13009

1R

390k D2

D1

V+

R9

R8

TXFR_GATE

FR104 D10

RT2

CON2 R37

+

C31 R32 6k8

FR104

Thermal switch

C9 4u7 50V

1 2

22R C32 100u 35V

+

2k7

1N4007 1N4007

Fan (14V 0.15A) V-

100n

Base transformer drive VCC

16

+I2

OUTC

13

15

R34 5k6

-I2

C1

8

C29

3

COMP

E1

9

10n C23

4

DTC

C2

11

5

CT

E2

10

R30 5k6

R24 1k

R36 5k6

10n

6

RT

GND

7

V-

Voltage loop compensation

VV-

R17 22k Gives 43kHz

1n

10n

V-

V-

V-

D5 1N4148

Soft-start

VVREF

V-

VREF

ZD3 C6V2 V-

C34

V-

V-

C15

V-

C11 D4 4u7 50V 1N4148

V-

VR1 gives 10-15V range

R15 1k5

C18 4u7 50V

R28 1k5

Short-circuit protection V+

V-

R21 68k

C24 1u 50V

R29 120k

R33 5k6

R35

D13

750R

1N4148 VCC is about 22.5V when operating normally - less if running in self-excited/startup mode

R19 10k

R31 6k8

+

V-

R12 1k5

FR104 C27 47u 50V

+

R22 27k

V-

+

Current loop compensation

R23 15R R27 15R

FR104 D11

R18 3k9

Q2 2SC2655

22n

1N4752

VR1 1k

C25

R10 3k9

+

V-

C26 220p

C16 100n

1N4752

14

VCC

D12

ZD1

VREF

Auxiliary supply

VCC

VREF

ZD2

-I1

Osci.

VCC

VREF 10n

VCC

+I1

12

2

C28 R40 1k5

TL494CN

Q3 2SC2655

IC1

1

+

R39 680R

V-

Q5 2SC1815

C30 2u2 50V C33

R38 1k5

10n V-

V-