IRS20954STRPBF International Rectifier, IRS20954STRPBF Datasheet - Page 9

• 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

Over-Current Protection (OCP)
The IRS20954 features over-current protection to protect the power MOSFET from over load conditions. The IRS20954 enters
shutdown mode when it detects over-current condition either from low-side or high-side current sensing. The timing control
block measures resume timing interval with an external timing capacitor Ct. All the critical timing of the over-current protection is
specified and guaranteed for secure protection.
The sequence on the over-current detection is:
1.
2.
3.
4.
5.
6.
Functional Description
Floating PWM Input
The IRS20954 has a floating input interface which enables easy half bridge implementation. Three pins, V
and IN, are referenced to V
is typically middle point of DC bus in a half bridge configuration.
The IRS20954 also has a non-floating input with V
www.irf.com
As soon as either high or low-side current sensing block detects over-current condition, the OC Latch (OCL) flips and
shutdowns the outputs LO and HO.
The CSD pin starts discharging the external capacitor C
When V
The CSD pin starts charging the external capacitor C
When V
If one of current sensing block detects over-current condition, the sequence is repeated until the cause of over-current
goes away.
SCD
SCD
crosses the lower threshold V
crosses the upper threshold V
SS
. As a result, the PWM input signal can be directly fed into IN referencing ground, which
Not recommended for new designs.
Floating Bias
0V – 200V
Please use IRS20957SPBF.
Figure 5: Floating PWM Input Structure
COM
VDD
CSD
VSS
IN
IRS20954
th2
th1
, the output signal from the COMP2 resets the OCL.
, the COMP1 flips and enables shutdown signal released.
Floating Input Isolation
SS
tied to COM.
t
.
t
.
LEVEL
SHIFT
HV
PROTECTION
IRS20954SPBF
DD
, CSD
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