irs20954s International Rectifier Corp., irs20954s Datasheet - Page 10

• Manufacturer Part Number: irs20954s
• Description: Protected Digital Audio Driver
• Manufacturer: International Rectifier Corp.

The internal protection control block manages operational mode between shutdown and normal, with a help from CSD pin.
Shutdown mode forces LO and HO to output 0 V to the COM and V
The external capacitor pin, CSD, provides five functions.
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1.
2.
3.
4.
5.
Protection Control
Power up delay timer for self reset configuration
Self-reset configuration
Shutdown input
Latched protection configuration
Shutdown status output (host I/F)
Ct
CSD Capacitor
OC detection
V
VDD
CSD
VSS
CSD
SD
VAA
VSS
Discharge
Vth1
Vth2
Figure 7: Shutdown Functional Block Diagram
Shutdown
Figure 6: Over-Current Protection Timing Chart
Power on mute
Vth2
Vth1
COMP1
COMP2
Charge
`
`
Release
UVLO(VCC)
LEVEL
SHIFT
HV
OC
Normal operation
t
S
OCL
S
R
respectively to turn the power MOSFET off.
/ t
Q
OCH
FLOATING INPUT
PWM
DEAD TIME
LEVEL
SHIFT
HV
reset interval
SD
Protection
`
LEVEL
SHIFT
HV
HO
LO
Normal operation
FLOATING HIGH SIDE
OC DET (H)
UVLO(VB)
OC DET (L)
LOW SIDE
IRS20954S
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