Application Note
5
2011-07-06
1 Abstract
ICE2HS01G is our 2
nd
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.
TL431
OPTO
Q
PH
C
RES
C
O1
C
O2
R
BA1
R
BA2
R
OVS2
R
OVS3
R
OVS1
R
oc
C
oc
Q
PL
C
BUS
R
T
C
SS
R
FMIN
R
reg
R
OCP
R
FT2
R
FT1
R
SS1
C
SS1
Q
SH
Q
SL
IC Dr
iver
IC Driver
Pulse
Trans.
R
INS1
R
INS2
HG LG
R
INS3
VINS
VCC
C
VCC
HV
VCC
GND
CS
C
CS1
R
CS1
D
CS2
R
CS2
C
CS2
CL
C
CL
SRD
R
CL
R
SRD
Q
SRD
SHG
SLG
L
res
HV IC
LOAD
FREQ
SS
Timer
C
T
Delay
EnA
TD
V
ref
V
mc
V
res
ICE2HS01G
R
EnA
R
delay
R
TD
R
mc1
R
res1
R
mc2
R
res2
V
out
C
EnA
Q
S1
Q
S2
Q
S3
Q
S4
D
CS1
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