IRS20954STRPBF International Rectifier, IRS20954STRPBF Datasheet - Page 19

• Manufacturer Part Number: IRS20954STRPBF
• Description: IC DVR DGTL AUDIO PROT 16-SOIC
• Manufacturer: International Rectifier
• Type: MOSFET Driverr

Specifications of IRS20954STRPBF

• Applications: Amplifiers, Receivers
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The high-side bootstrap power supply can be charged up through a resistor from the positive supply bus to V
internal 20.8 V zener diode clamp between V
for the initial low-side ON.
To determine the requirement for Rcharge, following condition has to be met;
Where I
Note that Rcharge can drain floating supply charge during on state of high-side, which limits maximum PWM modulation index
capability of the system. Rcharge should be large enough not to discharge the floating power supply during the high-side ON.
The protection control block monitors the status of the power supply of V
Voltage Lockout threshold. The LO and HO of the IRS20954 are disabled by shutdown until the UVLO of V
released and CSD timer capacitor Ct is charged up. After the UVLO of V
www.irf.com
I
CHARGE
Start-up Sequence (UVLO)
I
>
CHARGE
QBS
Charging V
I
QBS
is high-side quiescent current
is a required charging current through Rcharge
BS
Prior to start
PWM
Not recommended for new designs.
Please use IRS20957SPBF.
Figure 19: Bootstrap Supply Pre-Charging
CSD
VDD
VSS
VREF
OCSET
DT
B
IN
NC
and V
IRS20954S
Figure 18: Supplying V
10.4V
S
. Advantage of this scheme is to eliminate the minimum duration required
COM
CSH
VCC
NC
LO
HO
VB
VS
Rdd
DD
CC
DD
and V
is released, CSD pin resets power-on timer. At the
CC
whether the voltages are above the Under
12V
+B
Vcc
-B
IRS20954SPBF
B
pin by utilizing an
CC
and V
DD
19
are