LM5071HEEVAL National Semiconductor, LM5071HEEVAL Datasheet - Page 12

• Manufacturer Part Number: LM5071HEEVAL
• Manufacturer: National Semiconductor

Specifications of LM5071HEEVAL

• Lead Free Status / Rohs Status: Not Compliant

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A Note For Using The Efficiency
Optimized EP13 Power
Transformer DA2383
Please note that the DA2383 is a single output transformer.
When using a DA2383 to obtain better efficiency (See Figure
3 for the applicable load and AUX input voltage levels), D5
should be removed and installed onto the Q2 pads on the top
side of the evaluation board. This is because the secondary
winding of DA2382 uses Pins 6 through 9 of the transformer
bobbin, unlike DA2257 that only uses of Pins 7 and 8 for the
secondary winding. The maximum converter stage efficiency
at 3.3A will be expected to be greater than 84%.
Appendix: LM5071 Evaluation Board Bill of Materials
ITEM
BR1
BR2
C10
C15
C16
C19
C20
C22
C23
C25
C26
C27
C28
C31
C1
C2
C4
C5
C7
C8
C9
D1
D2
D3
D4
D5
D6
Q1
Q3
P3
P4
J1
J2
J4
J5
L1
L3
CBRHD-01
CBRHD-01
C0805C473K5RAC
C0805C681K5RAC
C5750X7R2A475M
C5750X7R2A475M
C3216X5R0J106M
C3216X5R0J106M
C3216X5R0J106M
C3216X5R0J106M
C3216X5R0J106M
EMVY6R3ADA331MF80G
C2012X7R1E105K
C2012X7R1E474K
C0805C102K5RAC
C0805C102K5RAC
C0805C331K5RAC
C0805C473K5RAC
C2012X7R2A104K
C4532X7R3D222k
C0805C473K5RAC
S3BB-13
NU
CRH01
CMHD4448
12CWQ03FN
CMR1U-01M
RJ-45-8N-B
PJ-102A
3104-2-00-01-00-00-080
3104-2-00-01-00-00-080
bus-wire short
DO1813P-331MLD
5012K-ND
5012K-ND
SUD25N15-52
CMPT5401
PART NUMBER
DIODE BRIDGE, SMDIP, CENTRAL
DIODE BRIDGE, SMDIP, CENTRAL
CAP, CER, CC0805, KEMET
CAP, CER, CC0805, KEMET
CAPACITOR, CER, CC2220, TDK
CAPACITOR, CER, CC2220, TDK
CAPACITOR, CER, CC1206, TDK
CAPACITOR, CER, CC1206, TDK
CAPACITOR, CER, CC1206, TDK
CAPACITOR, CER, CC1206, TDK
CAPACITOR, CER, CC1206, TDK
CAPACITOR, AL ELEC, CHEMI-ON
CAPACITOR, CER, CC0805, TDK
CAPACITOR, CER, CC0805, TDK
CAP, CER, CC0805, KEMET
CAP, CER, CC0805, KEMET
CAP, CER, CC0805, KEMET
CAP, CER, CC0805, KEMET
CAPACITOR, CER, CC0805, TDK
CAPACITOR, CER, CC1812, TDK
CAP, CER, CC0805, KEMET
SCHOTTKY, SMB, DIODE INC
ONLY INSTALL FOR AUX
SCHOTTKY, DO123, TOSHIBA
DIODE, DO123, CENTRAL
SCHOTTKY, TO252, IR
ULTRAFAST DIODE, CENTRAL
RJ-45 CONNECTOR
POWER JACK
POST, MILL MAX
POST, MILL MAX
AWG #22 BUS WIRE
SM INDUCTOR, COILCRAFT
TEST POINT, KEYSTONE
TEST POINT, KEYSTONE
MOSFET, N-CH, TO252, VISHAY
BIPOLAR, PNP, SOT23, CENTRAL
12
DESCRIPTION
A Few More Hints On Improving
The Efficiency
Since the evaluation board is designed as a low cost solu-
tion, upgrading the following components with slightly more
expensive devices will increase the efficiency.
installed SUD25N15-52, to improve the dc-dc converter ef-
ficiency by 1%
Schottky barrier rectifier with low leakage current, to in-
crease the AUX operation’s end-to-end efficiency by at least
1%. This is suitable for an AUX input voltage greater than
15V.
(i) Use SUD15N15-95 for Q1; a faster device than the
(ii) Use DFLS1100 for D1; a 100V 1A high voltage
<
14V
100nF, 100V
125mA, 75V
4.7µF, 100V
4.7µF, 100V
330µF, 6.3V
0.47µF, 25V
330pF, 50V
2.2nF, 2 kV
0.5A, 100V
0.5A, 100V
10µF, 6.3V
10µF, 6.3V
10µF, 6.3V
10µF, 6.3V
10µF, 6.3V
1.0µF, 25V
150V, 25A
47nF, 50V
680p, 50V
47nF, 50V
47nF, 50V
3A, 100V
1A, 200V
12A, 30V
1A, 100V
150V, 1A
1nF, 50V
1nF, 50V
VALUE
0.33µH