ST AN1132 Application note
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AN1132 |
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APPLICATION NOTE |
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90W SMPS FOR MONITORS WITH STANDBY FUNCTION
by Claudio Adragna
Purpose of this note is to provide a brief summary of the specifications and the functionality of the application board implementing a 90W multioutput SMPS for monitors, based on the L5991, current mode PWM controller.
Evaluation results are also presented so as to underline the benefits offered by the L5991 in such a new generation of SMPS that requires a superior efficiency in standby conditions, aiming at compliance with energy saving standards.
Design Specifications
Table 1 summarises the electrical specification of the application. The complete electrical schematic is shown in fig. 1 and the bill of material is listed in Table 2.
Table 1. Design Specification
Input Voltage Range (Vin) |
88 to 264 Vac |
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Mains Frequency (fL) |
50/60 Hz |
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Maximum Output Power (Pout) |
90W |
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Horizontal Deflection |
Vout = 200V |
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Iout = 0.325A |
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Full load ripple = 1% |
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Video Amplifier |
Vout = 80V |
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Iout = 0.125A |
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Outputs |
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Full load ripple = 1% |
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Vertical Deflection |
Vout = ±15V |
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Iout = 0.33A |
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Full load ripple = 1% |
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Heater |
Vout = 6.3V |
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Iout = 0.8A |
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Full load ripple = 2% |
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Switching Frequency in Normal Mode (fosc) |
40kHz |
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Switching Frequency in Suspend / OFF mode (fSB) |
18kHz |
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Target Efficiency (@ Pout =90W, Vin =88 ÷264 Vac) (η) |
> 80% |
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Maximum Input Power (@ Pout = 0.5 W, Vin =88 ÷ 264 Vac) |
≤ 2W |
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The selected topology is flyback. The operation mode (@ Pout = 90W ) is CCM (Continuous Conduction Mode) at low mains voltage, DCM (Discontinuous Conduction Mode) at high mains voltage. This design choice relieves the stress on the power components at low mains voltage, compared with a full DCM solution.
The application will benefit from the features of the L5991 PWM controller in order to minimise the power drawn from the mains under light load conditions: low start-up and quiescent currents, and Standby function.
September 2000 |
1/12 |
2/12 |
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C01 4700pF 4KV C02 |
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.Figure1 |
AN1132 |
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F01 |
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RP1 |
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NOTE APPLICATION |
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KBU4G |
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R31 4.7M |
R32 4.7M |
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88 to 264 |
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R01 |
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1 |
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18 |
D07 BYT11-800 |
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200V |
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VAC |
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C03 220 F |
R21 |
C10 |
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65W |
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17 |
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400V |
47K |
47nF |
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D08 STTA106 |
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H1 1 H |
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3W |
250V |
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80V |
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16 |
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C13 |
C14 |
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D06 |
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C15 |
10W |
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220 F |
100 F |
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D01 |
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STTA106 |
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R23 C12 |
100V |
250V |
22 F 100V |
GND |
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1N4148 |
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4 |
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SchematicElectrical. |
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R02 56K |
R03 56K |
D05 1N4148 |
7 |
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14 |
D9 BYW100-100 |
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6.3V |
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R22 22 |
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C16 |
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R07 47K |
R08 330K |
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5W |
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1000 F |
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16V |
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C23 10nF |
R09 22 |
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8 |
T1 |
13 |
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C09 56nF |
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C04 47 F |
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12 |
D10 BYW100-100 |
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+15V |
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7 |
15 |
14 |
9 |
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C17 |
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5W |
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8 |
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3 |
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470 F 25V |
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R12 22 |
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11 |
C18 |
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R34 |
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10 |
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C07 0.1 F |
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MF01 |
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470 F 25V |
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4.7K |
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IC1 |
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-15V |
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STP7NB60FI |
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4 |
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10 |
D11 BYW100-100 |
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L5991 |
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R13 1K |
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R24 |
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5W |
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R20 |
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13 |
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C06 |
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47 |
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12K |
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C05 |
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2 |
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12 |
100pF R14 |
R15 |
R26 |
R25 |
C19 |
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6800pF |
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0.47 |
0.47 |
2.7K |
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47 F 25V |
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R19 |
Q3 |
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11 |
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10K |
BC337 |
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R16 100 |
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1 |
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16 |
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6 |
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5 |
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VR1 |
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R33 |
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C08 |
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C20 |
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100K |
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9.1K |
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3.3nF |
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6 |
2 |
R27 470K |
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R29 |
R30 |
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C21 |
C22 |
330K |
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OP1 |
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4 |
330pF |
1nF |
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TPS5904 |
3 |
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R28 |
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4.7K |
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D99IN1070B |
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AN1132 APPLICATION NOTE |
Table 2. Component List of the circuit of fig. 1. |
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Symbol |
Value |
Note |
R1 |
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NOT USED (shorted) |
R2, R3 |
56kΩ |
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R7 |
47kΩ |
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R8, R29 |
330kΩ |
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R9, R12, R22 |
22Ω |
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R13 |
1kΩ |
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R14, R15 |
0.47Ω |
metallic film |
R16 |
100Ω |
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R19 |
10kΩ |
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R20 |
12kΩ |
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R21 |
47kΩ |
3W |
R24 |
47Ω |
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R26 |
2.7kΩ |
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R27 |
470kΩ |
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R28 |
4.7kΩ |
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R31, R32 |
4.7MΩ |
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R33 |
9.1kΩ |
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VR1 |
100kΩ |
multiturns, Bourns 3296W or equivalent |
C1, C2 |
4.7nF |
1kV |
C3 |
220μF |
400V, electrolytic, Panasonic TSUP or Roederstein EYS |
C4, C19 |
47μF |
25 V, electrolytic |
C5 |
100pF |
plastic film |
C6 |
6.8nF |
ceramic multilayer |
C7 |
100nF |
plastic film |
C8 |
3.3nF |
plastic film |
C9 |
56nF |
plastic film |
C10 |
47nF |
250V, polypropylene o polystyrene film (Siemens-Matsushita) |
C13 |
220μF |
100 V electrolytic, Roederstein EKE or equivalent |
C14 |
100μF |
250 V, electrolytic, Roederstein EKS or equivalent |
C15 |
22μF |
100 V, electrolytic, Roederstein EKE or equivalent |
C16 |
1000μF |
16V, electrolytic, Panasonic FA or equivalent |
C17, C18 |
470μF |
25 V, electrolytic, Panasonic HFZ or equivalent |
C21 |
330pF |
ceramic or plastic film |
C22 |
1nF |
ceramic or plastic film |
C23 |
10nF |
plastic film |
D1, D5 |
1N4148 |
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D6, D8 |
STTA106 |
ST, TurboSwitch |
D7 |
BYT11-800 |
ST, Ultrafast |
D9, D10, D11 |
BYW100-100 |
ST, Ultrafast |
IC1 |
L5991 |
ST |
T1 |
ETD4407 |
ITACOIL, see Table 3 |
OP1 |
TPS5904 |
TI |
MF1 |
STP7NB60FI |
ST |
RP1 |
KBU4G |
GI, or equivalent 4A rectifier bridge |
Q3 |
BC337 |
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F1 |
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5A fuse |
H1 |
1μH |
axial inductor |
M1, M2, M3 |
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connectors |
Notes: - if not otherwise specified, all resistors are 1/4 W, 1%
-the MOSFET is provided with a 9.5 °C/W heatsink
-components indicated in the PCB and not quoted in table 2 are not assembled
3/12
AN1132 APPLICATION NOTE
Table 3. Transformer Specification (Part Number ETD4407, supplied by ITACOIL).
Core |
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Philips ETD44, 3C85 Material |
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Bobbin |
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Horizontal mounting, 18 pins |
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Air gap |
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1 mm for an inductance 1-4 of 380 μH |
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Leakage inductance |
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< 10μH |
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Winding |
Wire |
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S-F |
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Turns |
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Notes |
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Pri1 |
4xAWG29 |
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2-4 |
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19 |
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Sec1 |
AWG25 |
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17-18 |
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48 |
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Windings |
Sec2 |
AWG25 |
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15-16 |
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32 |
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Sec3 |
AWG25 |
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13-14 |
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3 |
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Evenly spaced |
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Spec & Build |
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Sec4 |
AWG25 |
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11-12 |
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6 |
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Bifiliar with Sec5 |
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Sec5 |
AWG26 |
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10-11 |
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6 |
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Bifiliar with Sec4 |
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Pri2 |
4xAWG29 |
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1-2 |
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19 |
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Aux |
AWG29 |
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8-7 |
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8 |
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Evenly spaced |
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Figure 2. PCB layout: Component side and bottom layer (top view); 1:1.33 scale
4/12
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