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NOTE.
TRANSFORMER IS TO BE USED ON SECONDARY SIDE OF MAINS
ISOLATION BARRIER (I.E. THIS TRANSFORMER IS NOT REQUIRED
TO PROVIDE MAINS ISOLATION BARRIER)
MAXIMUM VOLTAGE BETWEEN WINDINGS <60V
SHORTED TURN FOIL SCREEN TO BE
ELECTRICALLY CONNECTED TO CORE CLAMP
CONDUCTIVE ADHESIVE FOIL MAY BE USED
FOIL TO BE COVERED IN A LAYER OF MYLAR TAPE
ELECTRICAL REPRESENTATION
TX2
Ferrite Switch Mode
L925TX
4
41T
SECONDARY1
5
41T
SECONDARY2
6
1
11
16T
22T
SECONDARY3
PRIMARY1
12
2
9
PRIMARY2
16T
14T
SECONDARY4
3
10
7
10T
SECONDARY5
8
VIEW FROM SIDE OF PART
SHOWING PIN LENGTH DIMENSIONS
MATING FACE OF TX
7 REF.
PCB
2.5 MAX
VIEW FROM SIDE OF PART
SHOWING OUTER FOIL SCREEN
6 to 8mm 10THOU COPPER
OUTER SCREEN
SEE VIEW GIVING PIN
LENGTH DIMENSIONS
VIEW FROM TOP OF PART
WITH PART INSTALLED IN PCB
PIN 1 TO BE MARKED
1
12
2
11
3
10
1.1 INCH
4
9
5
8
6
7
1.2 INCH
NOTE PIN NUMBERING CONVENTION
ARRANGEMENT OF INTERNAL FOIL SCREENS
WIRE
FOIL (2mil OR THINNER)
INSULATOR
FULL WINDING WIDTH
SOLDER JOINT TO BE COVERED IN TAPE
JOINT MUST BE MADE TO CLEAN COPPER
(I.E. NOT THROUGH MYLAR INSULATOR)
1
1
BUMP FROM SCREEN JOINT TO BE
2
ADJACENT TO CORE WINDOW
TO MINIMISE LOSS OF WINDING HEIGHT
3
2
MAXIMUM OVERLAP ON ENDS OF
4
SCREENS TO BE LESS THAN 1mm
5
TO MINIMISE CAPACITIVE COUPLING
WHICH WOULD PRODUCE SHORTED
6
TURN FOR HIGH FREQUENCY CURRENTS
3
SOLDER JOINTS TO BE MADE HALF WAY
ALONG LENGTH OF FOIL FOR REDUCED LOSSES
WINDING
TURNS
WIRE DETAILS
PRIMARY2
16
ENAMELLED COPPER WIRE
SCREEN 2
INSULATED 2mil COPPER FOIL
SECONDARY3
22
ENAMELLED COPPER WIRE
SECONDARY4
14
ENAMELLED COPPER WIRE
SECONDARY5
10
ENAMELLED COPPER WIRE (BIFILAR)
SECONDARY1
41
ENAMELLED COPPER WIRE
SECONDARY2
41
ENAMELLED COPPER WIRE
SCREEN 1
INSULATED 2mil COPPER FOIL
PRIMARY1
16
ENAMELLED COPPER WIRE
WINDING ARRANGEMENT ON BOBBIN
2 LAYERS MYLAR TAPE
PRIMARY2
SCREEN2
SECONDARY4
+
SECONDARY3
SECONDARY5
SECONDARY1
+
SECONDARY2
SCREEN1
PRIMARY1
MATERIALS
CORE
PQ32/30 in PC44 MATERIAL (OR EQUIVALENT)
CORE TO BE GAPPED IN CENTRE LEG TO GIVE REQUIRED Lpri (GAP APPROX 0.4mm)
(Lpri = 450uH +/- 10% PRIMARY INDUCTANCE MEASURED FROM PIN 1 TO 3 )
PART NUMBER TDK PC44PQ32/30Z-12 (OR EQUIVALENT)
BOBBIN
PART NUMBER TDK BPQ32/30-1112CP (OR EQUIVALENT)
CLAMP
PART NUMBER TDK FPQ32/30-A (OR EQUIVALENT)
ASSEMBLY DETAILS
1
PART TO BE MARKED WITH PART NUMBER / ISSUE NUMBER
2
INTERNAL SCREENS TO BE FULL WIDTH. CONNECTION TO SCREEN VIA SOLDER JOINT TO COPPER (SEE DIAGRAM)
SOLDER JOINT TO BE ARRANGED TO PRODUCE A LUMP IN THE CORE WINDOW
SOLDER JOINT TO MADE MADE TO CLEAN COPPER AND JOINT TO BE TAPED.
SOLDER JOINT TO BE MADE HALF WAY ALONG LENGTH OF THE FOIL
SCREEN TO BE HIGHEST POSSIBLE RESISTANCE FOIL FOR LOWEST LOSSES. (I.E. FOIL AS THIN AS POSSIBLE)
SCREEN TO BE MADE FROM MAXIMUM 0.05mm (2MIL) FOIL
3
WINDINGS WILL BE A TIGHT FIT ON BOBBIN. NOTES AND WINDING ARRANGEMENT SPECIFIED TO BE ADOPTED.
4
TRANSFORMER TO BE FITTED WITH AN OUTER COPPER SCREEN WRAPPED AROUND THE OUTSIDE OF THE
OF THE TRANSFORMER CORE AND CONTACTING THE METAL CORE CLAMP THUS FORMING A SHORTED TURN
TO LEAKAGE FLUX. SEE DIAGRAM
SCREEN TO BE 10THOU COPPER STRIP 6 to 8mm WIDE AND FITTED OVER THE JOIN OF THE CORE HALVES.
12
SCREEN TO BE COVERED IN A LAYER OF TAPE.
11
5
PIN 1 ON BOBBIN TO BE MARKED WITH WHITE PAINT (OR OTHERWISE)
10
THIS MARKING TO BE USED TO ORIENTATE TX DURING WINDING PHASE TEST
6
100% PHASE TEST AND ISOLATION TEST TO BE CARRIED OUT ON ALL WINDINGS.
9
8
7
DRAWING TITLE
DV78 450uH FLYBACK TX
Filename:
L925TX_1.1.Sch
Notes:
A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB
Contact Engineer:
Kevin Lamb
WINDING DETAILS
No PER
ID
OD
START
END
CABLE
PIN #
PIN #
1
0.8mm
0.86mm
3
2
SPACE WINDING ACROSS WHOLE BOBBIN WIDTH
1
SCREEN TO HAVE NO OVERLAP AT ENDS
1
0.25mm 0.3mm
11
12
WIND ACROSS WHOLE BOBBIN WIDTH BETWEEN GAPS IN SEC4
1
0.66mm
0.72mm
9
10
SPACE WINDING ACROSS WHOLE BOBBIN WIDTH
2
0.66mm
0.72mm
7
8
WIND AS A BIFILAR PAIR ACROSS WHOLE BOBBIN WIDTH
1
0.25mm
0.3mm
4
5
WIND SEC1 AND SEC2 AS A BIFILAR PAIR ACROSS
WHOLE BOBBIN WIDTH
1
0.25mm 0.3mm
5
6
1
SCREEN TO HAVE NO OVERLAP AT ENDS
1
0.8mm
0.86mm
2
1
SPACE WINDING ACROSS WHOLE BOBBIN WIDTH
1 FULL LAYER
WIND SECONDARY 4 FIRST THEN SECONDARY 3 IN THE GAPS
1 FULL LAYER WIND AS BIFILAR PAIR
SEC1 AND 2 WOUND AS BIFILAR PAIR ACROSS FULL WIDTH
1 FULL LAYER
03_E290
SLS
06-10-03
'VIEW FROM SIDE OF PART SHOWING PIN LENGTH DIMS' added.
KAL
02-07-03
02_E195
Production Release
02_E086
KAL
21-03-03
Changed Pri1,2 and Sec1,2 turns, Lpri & gap, Added outer screen
02_E336
KAL
20-11-02
Prototype Release
ECO No.
INITIALS
DATE
DESCRIPTION OF CHANGE
Contact Tel:
(01223) 203200
Printed:
8-Oct-2003
Sheet
1
of
NOTES
1.1
1.0
B.0
A.0
ISSUE
L925TX
1
DRAWING NO.
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