IRS27951SPBF International Rectifier, IRS27951SPBF Datasheet - Page 18

• 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

PCB Layout Tips
Distance between high and low voltage components: It is strongly recommended to place the components tied to
the floating voltage pins (V
Ground Plane: In order to minimize noise coupling, the ground plane should not be placed under or near the high
voltage floating side.
Gate Drive Loops: Current loops behave like antennas and are able to receive and transmit EM noise. In order to
reduce the EM coupling and improve the power switch turn on/off performance, the gate drive loops must be reduced
as much as possible. For the low-side driver, the return of the drive loop must be directly connected to the COM pin
of the IC and separate with signal ground (power ground and signal ground have star connection at COM pin).
Supply Capacitor: It is recommended to place a bypass capacitor (C
ceramic capacitor is suitable for most applications. This component should be placed as close as possible to the
pins in order to reduce parasitic elements.
Routing and Placement: 1) The 8-pin IC has only one COM pin for both signal return and power return, so it is
strongly recommended to route the signal ground and power ground separately and with a star connection at the
COM pin. 2) The RT pin provides a current reference for the internal oscillator and needs to be kept as clean as
possible to avoid frequency jittering or duty-cycle mismatch between high-side and low-side. The components
connected to this pin must keep away from the high frequency switching loop such as the gate driver loop and the VS
node. The PCB traces connected to RT pin also need to be kept away from any switching node. 3) Connect CT
capacitor directly to COM pin, don’t share the return with any other signal ground.
C
www.irf.com
BS
Capacitor: The C
BS
B
capacitor should be placed as close as possible to the VB and VS pins.
and V
S
Figure 6: VS sensing over current protection
) near the respective high voltage portions of the device.
18
IN
) between the V
© 2010 International Rectifier
CC
and COM pins. A 1µF
IRS27951S
IRS27952S