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1
Abstract
nd
ICE2HS01G is our 2
generation half-bridge LLC controller designed especially for high efficiency with its
synchronous rectification (SR) control for the secondary side. With its new driving techniques, SR can be
realized for half-bridge LLC converter operated with secondary switching current in both CCM and DCM
conditions. No individual SR controller IC is needed at the secondary side.
A typical application circuit of ICE2HS01G is shown in Figure 1. For best performance, it is suggested to use
half-bridge driver IC in the primary side with ICE2HS01G.
C
BUS
HV
VCC
C
R
delay
Delay
R
EnA
EnA
C
TD
EnA
R
TD
V
R
R
res1
mc1
V
R
mc2
V
Timer
R
res2
C
R
T
Figure 1
Typical application circuit
In this application note, the design procedure for LLC resonant converter with ICE2HS01 is presented,
together with an example of a 300W converter with 400VDC. Detailed calculation of the values of the
components around the IC is also included, together with tips on the PCB layout.
2
Design Procedure
2.1
Target Specifications
Application Note
R
INS1
R
INS2
R
INS3
HV IC
VCC
GND
VCC
VINS
HG LG
CS
CL
ICE2HS01G
SRD
ref
mc
SHG
SLG
res
SS
FREQ
LOAD
R
R
OCP
reg
R
R
SS1
C
R
SS
FMIN
R
T
C
SS1
Q
PH
L
res
Q
PL
C
RES
C
CS1
R
C
R
D
CS2
CS2
CS1
CS1
D
CS2
C
CL
R
CL
R
SRD
Q
Pulse
SRD
Trans.
Q
S1
Q
S2
IC Driver
Q
S3
Q
S4
FT1
OPTO
FT2
5
Q
SH
C
C
O1
O2
Q
SL
R
OVS1
R
BA2
R
OVS2
C
R
oc
oc
R
BA1
TL431
R
OVS3
V
out
2011-07-06
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