IRS27951SPBF International Rectifier, IRS27951SPBF Datasheet - Page 12

• 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

State Diagram
UVLO Mode
The IC remains in the UVLO condition until the voltage on the V
V
quiescent current of I
supply voltage condition of V
Sleep Mode
When V
towards the enable threshold, V
circuits are disabled and the Ic consumes I
When the voltage at the CT/SD pin exceeds V
at the RT pin is enabled.
The IC can be placed in Sleep mode while operating in Normal mode by externally pulling the CT/SD pin below
V
start.
Normal Mode
The IC enters in normal operating mode once the UVLO voltage and V
is 2V under normal mode. Gate drive signal appears at HO and LO with fixed 50% duty-cycle.
During this mode, the over-current protection scheme using the VS sense circuitry is active.
Current Fault Mode:
When operating in Normal mode, the IC senses the voltage on the VS pin each time the low-side device is turned
ON (with a leading edge blanking on LO, t
current gate pulse, disables the oscillator and gate drivers, and enters the Current Fault mode. When the IC enters
this state, RT and CT/SD pins are internally discharged and IC supply voltage must be recycled before the IC can
restart with soft-start again
www.irf.com
CCUV+
EN2
. When this occurs, the RT pin of the IC is internally discharged to COM to ensure a system restart with soft-
. During the time the IC remains in the UVLO state, the gate drive circuit is inactive and the IC draws a
CC
exceeds the V
CC START
CCUV+
. The UVLO mode is accessible from any other state of operation whenever the IC
CC
threshold the IRS2795 starts to charge up CT capacitor with I
< V
EN1
. During this period, the IC is in Sleep mode. The oscillator and gate drive
CC UV-
occurs.
blank
SLEEP
). When the voltage sensed exceeds VOCP, the IC terminates the
EN1
.
, the IC is pulled out of sleep mode and the 2V reference voltage
12
CC
pin exceeds the V
EN1
has been exceeded. The RT pin voltage
CC
turn on threshold voltage,
© 2010 International Rectifier
CT
startup current
IRS27951S
IRS27952S