Download 200 W, Single Output Power Supply

DN06010/D
Design Note – DN06010/D
200 W, Single Output Power Supply
Device
NCP1217
Application
Input Voltage
Refrigerator
90 to 270 Vac
Output Power
Topology
I/O Isolation
140 W / 200 W pk
CCM
(Continuous
Conduction
Mode) Flyback
Yes
Other Specifications
Output Voltage
Ripple
Nominal Current
Max Current
Min Current
Output 1
Output 2
Output 3
Output 4
14 V
200 mVp-p
10 A
14 A
0A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
PFC (Yes/No)
No
Minimum Efficiency
80%
Operating Temp Range
0 to +70˚C
Circuit Description
Key Features
This 14 Vout, off-line power supply was originally
designed for refrigeration control applications but can be
user tailored to accommodate most 12 to 15 volt
applications requiring 140 watts output continuous with a
200 watt peak capability.
The converter circuit is
designed around a continuous conduction mode (CCM)
flyback topology to minimize the inverter’s peak-toaverage current ratio. Slope compensation for D > 50% is
achieved with the unique internal architecture of the
NCP1217 controller and the value of resistor R9. The 100
kHz flyback transformer is designed with a compact
PQ3230 ferrite core. Voltage feedback and regulation is
implemented with a simple TL431 programmable
reference and optocoupler.
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August 2006, Rev. 0
CCM operation for low peak to average current ratio.
Output ripple reduction inductor (L3)
Dual common mode EMI filter for low conducted EMI.
Very low standby input current at no load (< 1 watt).
Simple, low cost yet highly effective converter circuit.
Overcurrent and overvoltage protection.
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DN06010/D
Schematic
F1
5A
AC
in
0.33uf
"X2"
C1
L2
L1
TH1
C3 C4
chassis
ground
11
MUR160
1N5245B
(15V)
D4
C16
47uf
25V
10nf
C17
R8
22K
R5
R9
2.4K
5
C10
C11
0.1uf
2,200uf
16V
7
10
R11
2K
SFH6156A-4
or H11A817A
U2
2
3
4
C9
8
8
1
+
14 V,
10 A
output
_
NCP1217
(100 kHz)
U1
C8
2,200uf
16V x 3
4,5,6
1N4148A
6
L3
10
C7
D3
R7
150
D2
MBR20100
R4
0.15,
2W
R3
4.7
R6
4.7K,
0.5W
1,2,3
4.7uH
Q1
SPP20N60S5
(Infineon)
2.2nf
"Y2"
x2
Gnd
T1
12
D1
C5
390uF
400Vdc
R1
1.0M
1/2W
T
10 ohm
4A, NTC
R2
33K
5W
BD1
6A
600V
0.33uf
"X2"
C2
10nf
500V
C6
C15
C14
C13
0.1
100pf
1nf
R10
1K
Opto
R12
1K
U3
TL431
Notes:
R13
15K
C12
0.1uf
R14
3.3K
1. Crossed schematic lines are not connected.
2. R4 sets current limit point; R9 sets slope compensation; R13 sets output voltage.
3. D4 sets OVP to 15V on Vcc rail (nominally 10 - 12Vdc)
4. Q1 and D2 will need heatsinks; Aavid #529802B02100 or similar
5 Small heatsink or plate recommended for BD1
6. L1 is Coilcraft CMT1-2.1-4L; L2 is Coilcraft F5593-A; L3 is Coilcraft PV-0-472-20L
7. TH1 is NTC thermistor for inrush limiting (Ametherm or equivalent).
8. Output caps C7, 8, 9, 10 should have low ESR with high ripple current rating.
August 2006, Rev. 0
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DN06010/D
MAGNETICS DESIGN DATA SHEET
Project / Customer: 14 Vout, 200 Wpk power supply
Part Description: 100 kHz flyback transformer, 14 Vout
Schematic ID: T1
Core Type: PQ3230 (Ae = 1.6)
Core Gap: Gap center leg approximately 1 mm for L = 300 uH
Inductance: 300 uH +/-10% (measured from pins 10 to 12)
Bobbin Type: Vertical 12 pin pcb mount
Windings (in order):
Winding # / type
Turns / Material / Gauge / Insulation Data
"A" Primary (12 - 11)
20 turns of 2 strands of #26HN over one layer;
Self-leads to pins; insulate for 2.7 kV to next layer.
Vcc/Aux (8 - 7)
5 turns sprial wound over the center 12.5mm with
3mm end margins. Insulate for 2.7 kV to next layer.
14 V Secondary (4,5,6 - 1,2,3)
6 turns of #17 equivalent Litz wire (or 8 strands
of #26HN twisted) over the center 12.5mm with
3mm end margins. Insulate with tape for 2.7 kV
to next winding.
"B" Primary (11 - 10)
Same as "A" primary. Insulate with tape.
Hipot: 2.7 kV primary/aux to 14V secondary. Vacuum varnish.
Lead Breakout / Pinout
Schematic
Bottom (pin side) view
12
Pri A
11
Pri B
10
Aux
7
1
2
3
12
11
10
9
8
7
14V
4 Sec
5
6
8
1
2
3
4
5
6
1
1
© 2006 ON Semiconductor.
Disclaimer: ON Semiconductor is providing this design note “AS IS” and does not assume any liability arising from its use; nor
does ON Semiconductor convey any license to its or any third party’s intellectual property rights. This document is provided only to
assist customers in evaluation of the referenced circuit implementation and the recipient assumes all liability and risk associated
with its use, including, but not limited to, compliance with all regulatory standards. ON Semiconductor may change any of its
products at any time, without notice.
Design created by Frank Cathell, E-mail: [email protected]
August 2006, Rev. 0
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