irs27951s International Rectifier Corp., irs27951s Datasheet - Page 16

• Manufacturer Part Number: irs27951s
• Description: Resonant Half-bridge Converter Control Ic
• Manufacturer: International Rectifier Corp.

The running frequency of the IRS795 is given by:
R
Or just simply select the RT value form the frequency chart shown below:
The maximum duty cycle is given by:
www.irf.com
Teq
is the total equivalent resistance at RT pin.
Figure 4: Switching frequency and RT selection
Figure 3: Dead-time with CT capacitor chart
500
450
400
350
300
250
200
150
100
2000
1800
1600
1400
1200
1000
50
f
0
800
600
400
200
SW
0
0
0
=
2
⋅
[
R
Dead‐Time vs. CT Value
DC
Teq
10
Frequency Chart
(
500
MAX
. 0
85
=
C
T
0
20
1
5 .
+
RT (KΩ)
−
40
16
CT (pF)
1000
(
t
pF
DT
*
)
30
+
f
t
)
DT
]
1500
40
CT=220pF
CT=330pF
CT=470pF
CT=1nF
2000
50
© 2010 International Rectifier
IRS27951S
IRS27952S