Dr. Flyback
TM
for Optimal Efficiency (95% to 96%) & Power Density
Resonant Flyback
Almost Always ZVS for both switches to reduce EMI filters size and to reduce transformer size
f
sw
V
EAO
-clamped=2.0V: Laser Trim for Switching Frequency Selection in Light Load Mode
Ready for GaN or SiC
March 27,2023 DRFLYBACK-A_SERIES-REV.00S Page 1
GENERAL DESCRIPTION
FEATURES
Dr. Flyback
TM
is the industry first Resonant Flyback
controller with integrated Super Junction Mosfet (SJMOS):
TSSOP package:
High Side integrates a 650V/4A 1.2Ω Power Mosfet
Dr. Flyback
TM
system’s both switches (High Side Mosfet
and Low Side Mosfet) are Almost Always Zero Voltage
Switching (ZVS). As the results, its efficiency is ~2%
higher than the traditional Quasi-Resonant (QR) Flyback
topology.
Dr. Flyback
TM
unique Input Power and Switching Frequency
one to one mapping, Dr. Flyback
TM
efficiency is optimized
for 100%, 75%, 50%, 25%, 10%, light load and no load
consumption.
APPLICATIONS
Output Power < 150W Flyback Converter
Optimal Power Density AC Adapter/Charger
(uncased) 32.8W/in
3
(2W/cc)
Cool Mos or GaN or SiC Device in AC Adapter
1. Patented (Both China and USA)
2. Industry First Resonant Flyback
3. Almost Always ZVS for both switches
4. f
sw
V
EAO
-clamped Options (@V
EAO
=2.0V): for switching
frequency optimization in light load mode (default:
89kHz). For other frequency selection or adjustment,
please consult with Champion FAEs
5. Optimal Efficiency and Power Density for Flyback
power system with minimum components (~60 total
components for USB Type-C PD AC Adapter)
6. ~2% Additional Efficiency Improvement: (Efficiency of Dr.
Flyback
TM
system － Efficiency of QR Flyback system)
~2% @ same test condition
7. η ~> 95%
+
, the highest Efficiency Flyback Power Supply
with Dr. Flyback
TM
, Dr. Bridge, Dr. SR and CM02
8. Lossless Snubber without snubber resistor; only C
snubber
(C
sn
): Typical C
sn
< 2nF
9. Kick Mode when V
EAO
< 0.5V/0.75V for super light load
10. Power Supply Application Range from 10W to 150W
11. Typical No Load Input Power Consumption < 30mW
@Vin = 230Vac @Vo=5V
12. Internal Jitter for easy EMI design
13. Internal 200V LDO with ~10.7V VDDA, LDO output
14. Protections:
A. Input-O.V.P ~450Vdc (318Vac):
When Input > 450Vdc, Dr. Flyback
TM
stops and when Input
< 450Vdc, Dr. Flyback
TM
runs immediately.
B. Brown In/Out ~117Vdc(83Vac)/37Vdc(bulk cap voltage)
C. Output-O.V.P with ZCD pin :
ZCD pin > 5V : Latch Mode
ZCD pin >2.8V : Retry Mode(Default)
D. Output-U.V.P with ZCD pin: Retry Mode
After V
EAO
> 2.75V and Internal Timer > 4~10mS (1/f
sw
)
(~900 cycles) timer delay for Output-U.V.P: Retry Mode
ZCDSHORT threshold = 0.375V, when VDDA < ~13.0V
ZCDSHORT threshold = 0.50V, when VDDA > ~13.0V
E. After V
EAO
> 3.65V and internal Timer > ~30mS for Peak
Load protection: Retry Mode
F. VDDA: VDDA O.V.P = 27.5V: Retry Mode
G. VDDA: UVLO-on ~21 V, UVLO-off ~7.5V
H. OTP/SD with 0.75V threshold and internal pull up 52uA
with external thermistor: Retry Mode;
Type-C PD IC or Secondary-Side any protections can use
a Photocoupler to pull down OTP/SD pin
I. Second Internal OTP ~150°C/130°C: Retry Mode
J. Isense OVP : Isense pin > 0.5V : Latch Mode
15. Regulation:
SSR, Secondary Side Regulation: with TL431 and with
Photocoupler: Dr. Flyback
TM
provides 450uA at V
EAO
pin.
Redundant OVP is possible through OTP/SD pin
16. Typical R
SENSE
can be a 0.25W power dissipation resistor
for AC Adapter
Dr. Flyback
TM
for Optimal Efficiency (95% to 96%) & Power Density
Resonant Flyback
Almost Always ZVS for both switches to reduce EMI filters size and to reduce transformer size
f
sw
V
EAO
-clamped=2.0V: Laser Trim for Switching Frequency Selection in Light Load Mode
Ready for GaN or SiC
March 27,2023 DRFLYBACK-A_SERIES-REV.00S Page 2
PIN CONFIGURATION
High Voltage 18-pin (TSSOP) TOP View
Q
H
: 650V/4A SJMOS, R
DS(on)
typ. =1.2Ω
HIGHOUT
5
RVIN
7 OTP/SD
RESETFAULT
15
VDDA
ISENSE
ZCD 13
VSSD
2
VL
12
10
VSSD
11
HV VIN
3
17
1
4
8
16
VL
LOWOUT
Csn
WindingDiode
14
Csn 18
6
VBOOT
VEAO9
SIMPLIFIED BLOCK DIAGRAM
VBOOT
16
CMP
RESETFAULT
8
VSSD
4
OTP
Output
RVIN
14
In/Out
0.75V
52uA
0.2uA
CI MODE
VL
Feed
Forward
TIMER
(650V Rdson~1.2 Ohm)
OTP/SD
7
VDDA
12
ZCD
VEAO
9
VEAO x K2
QH
~117Vdc (83Vac) /
37Vdc
OVP> 2.8V/5V
Control Fsw
LOW SIDE
LOGIC
450Vdc
JITTER For
Easy EMI
ISENSE
10.
2.5V
VEAO < 0.75V
Control I
VSSD
13
(The negative voltage
will be internally
clamped at ~5V)
0.75V
UVP< 0.375V/0.5V
VL
3,15
LOW SIDE
450uA/200uA
Input
Csn
200V
LDO
1uA
WindingDiode
5
LOWOUT
11
OVP
HIGH SIDE
VEAO x K1
HIGHOUT
17
VBOOT
800V
START
UP
1,18
HIGH SIDE
LOGIC
CI MODE
Output
Brown
10
VL
Isense OVP
VEAO > 1.73V
1.5V
10.7V
HVVIN
2
ZCD
6
Note: Q
H
: 650V/4A SJMOS, R
DS(on)
typ.=1.2Ω