The eGaN® FET
Journey Continues
eGaN® FET Application: High Frequency
Resonant Converters
David Reusch
Efficient Power Conversion Corporation
www.epc-co.com
EPC - The Leader in eGaN® FETs
1
Agenda
• Overview of Power Architecture
• Hard Switching Converters with eGaN®FETs
• Soft Switching Converters with eGaN®FETs
• Summary
EPC - The Leader in eGaN® FETs
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2
Intermediate Bus Architecture
AC input: 90~265 V
AC/DC
Front End
AC/DC
Front End
36-75 V
Bus
Converter
Bus
Converter
9.6-12 V
EPC - The Leader in eGaN® FETs
POL
POL
POL
5V
3. 3V
1.2 V
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3
Ideal Hard Switching
TVR
VIN
TCF
VDS
IDS
IOFF
VGS
VPL
VTH
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t
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44
100V Hard Switching FOM
FOM=(QGD+QGS2)*RDSON (nC*Ω)
160
140
QGS2
120
100
QGS2
80
60
QGS2
40
20
0
QGS2
QGD
QGD
QGS2
QGD
QGD
QGD
100 V eGaN®FET 80 V MOSFET 1
80 V MOSFET 2
80 V MOSFET 3
80 V MOSFET 4
VDS=0.5*VDS , IDS= 15 A
EPC - The Leader in eGaN® FETs
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5
Hard Switching Design
96%
375 kHz eGaN FET
Efficiency
94%
92%
250 kHz MOSFET
90%
36V MOSFET
36V eGaN FET
48V MOSFET
48V eGaN FET
60V MOSFET
60V eGaN FET
88%
86%
84%
0
2
4
6
8
EPC9102 Demo board
10
12
14
16
18
Output Current (A)
36 - 60 Vin, 12 Vout, 200 W, 375 kHz
EPC - The Leader in eGaN® FETs
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6
Resonant Bus Converter
High Frequency DC/DC Transformer
SR1
VGS(Q1,Q3)
VGS(SR1)
4:1
VGS(Q2,Q4)
VGS(SR2)
48V
12V
ILK1
ILK2
SR2
Ref: Y. Ren, M. Xu, J. Sun, and F. C. Lee, “A family of high power density unregulated bus
converters,” IEEE Trans. Power Electron., vol. 20, no. 5, pp. 1045–1054, Sep. 2005.
EPC - The Leader in eGaN® FETs
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7
100V Soft Switching FOM
FOM=(QOSS or QG)*RDSON (nC*Ω)
350
300
250
200
QOSS
QOSS
150
QOSS
100
QG
50
0
QG
QG
100 V EPC2001
80 V BSC057N08NS3G
80 V BSZ123N08NS3G
VDS=48 V
EPC - The Leader in eGaN® FETs
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88
40V Soft Switching FOM
FOM=(QOSS or QG)*RDSON (nC*Ω)
160
140
120
100
80
QG
60
QOSS
40
QOSS
20
QOSS
QG
QG
0
40 V EPC2015
40 V BSC027N04LSG 40 V BSZ040N04LSG
VDS=48 V
EPC - The Leader in eGaN® FETs
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99
eGaN® FET vs MOSFET
MOSFET
EPC - The Leader in eGaN® FETs
vs.
eGaN® FET
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10
ZVS Switching Comparison
TZVS = 42 nS
eGaN FET VDS
MOSFET VDS
TZVS = 87 nS
MOSFET VGS
eGaN FET VGS
FS = 1.2 MHz, VIN = 48 V, and VOUT ≈ 12 V
EPC - The Leader in eGaN® FETs
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11
Duty Cycle Comparison
DeGaN FET = 42%
D
MOSFET
= 34%
MOSFET VGS
eGaN FET VDS
MOSFET VDS
eGaN FET VGS
FS = 1.2 MHz, VIN = 48 V, and VOUT ≈ 12 V
EPC - The Leader in eGaN® FETs
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12
Efficiency Comparison
98
1.2 MHz
eGaN FET
10 W
12 W
14 W
96
95
1.2 MHz
MOSFET
94
22
Power Loss (W)
97
Efficiency (%)
24
93
92
91
20
1.2 MHz
MOSFET
18
16
14
12
10
8
1.2 MHz
eGaN FET
6
4
90
2
0
5
10
15
20
25
30
Output Current (IOUT)
35
40
0
5
10
15
20
25
30
35
40
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Output Current (IOUT)
FS = 1.2 MHz, VIN = 48 V, and VOUT ≈ 12 V
EPC - The Leader in eGaN® FETs
Loss Breakdown
Power Loss
(W)
12
10
Gate Drive
8
Transfomrer
Core
Conduction +
Turn Off
6
4
2
0
eGaN FET
IOUT = 2.5 A
MOSFET
IOUT = 2.5 A
eGaN FET MOSFET
IOUT = 20 A IOUT = 20 A
FS = 1.2 MHz, VIN = 48 V, and VOUT ≈ 12 V
EPC - The Leader in eGaN® FETs
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14
Frequency Capability
98
1.6 MHz
eGaN FET
10 W
12 W
14 W
96
95
0.8 MHz
MOSFET
94
22
20
Power Loss (W)
97
Efficiency (%)
24
93
92
91
18
16
14
12
0.8 MHz
MOSFET
10
8
1.6 MHz
eGaN FET
6
4
90
2
0
5
10
15
20
25
30
35
40
0
5
Output Current (IOUT)
10
15
20
25
30
35
40
Output Current (IOUT)
VIN = 48 V, and VOUT ≈ 12 V
EPC - The Leader in eGaN® FETs
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15
EPC9105 Bus Converter
EPC9105 Demonstration Board
36 - 60 VIN, 12 VOUT, 350 W, 1.2 MHz
LIN
Q1
4:1
2 SR
Q6,Q7
VOUT+
*
VIN+
Q3
*
LK1
LOUT
CIN
*
CRES
VIN-
Q2
Q4
LK2
2 SR
Q5,Q8
EPC - The Leader in eGaN® FETs
COUT
VOUTwww.epc-co.com
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97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
Power Loss (W)
Efficiency (%)
EPC9105 Bus Converter
48 VIN
0
5
10
15
20
25
30
Output Current (Io)
35
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
36 VIN
48 VIN
55 VIN
60 VIN
0
5
10
15
20
25
30
35
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Output Current (A)
FS = 1.2 MHz, VIN = 36-60 V, and VOUT ≈ VIN /4
EPC - The Leader in eGaN® FETs
Summary
eGaN FETs improve high frequency resonant
converter performance
• Lower output charge
• Lower gate charge
• More power delivery per cycle
EPC - The Leader in eGaN® FETs
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18
The end of the
road for silicon…..
is the beginning of
the eGaN FET
journey!
EPC - The Leader in eGaN® FETs
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19