IRS27951SPBF International Rectifier, IRS27951SPBF Datasheet - Page 16

• Manufacturer Part Number: IRS27951SPBF
• Description: IC DRIVER HALF-BRIDGE 8SOIC
• Manufacturer: International Rectifier

Specifications of IRS27951SPBF

• Output Isolation: Isolated
• Frequency Range: 46.6kHz ~ 285kHz
• Voltage - Input: 12 V ~ 18 V
• Voltage - Output: 12 V ~ 18 V
• Power (watts): 833mW
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Package: 8-lead SOIC
• Circuit: Resonant Half-Bridge
• Offset Voltage (v): 600
• Output Source Current Min (ma): 300
• Output Sink Current Min (ma): 900
• Vcc Range (v): 10-20V with UVLO
• Programmable Frequency (khz): 25-500
• Programmable Deadtime (ns): 200-2000
• Ocp Threshold (v): 2
• Pbf: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The running frequency of the IRS2795 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 (K )
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