irs20954s International Rectifier Corp., irs20954s Datasheet - Page 18

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irs20954s

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

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Table 1 shows suggested values of resistance for setting the deadtime. Resistors with up to 5% tolerance can be used if these
listed values are followed.
Power Supply Considerations
V
I
The resistance of R
In case of 400 kHz average PWM switching frequency, the required I
voltage yields Rdd=33 k .
Make sure I
input.
www.irf.com
Rdd
I
DD
DD
DDZ
= 1.5 mA x 300 x 10
is designed to be supplied with the internal zener diode clamp. V
d
t
V
V


B
Supplying V
B

Rdd
I

DD
10
DD
(Dynamic power consumption)
10
8 .
is below the maximum zener diode bias current, I
8 .
V
V

[:]
dd
0
to feed this I
5 .
DD
mA
-9
x switching frequency + 0.5 mA + 0.5 mA
DD
Table 1: Suggested Resistor Values for Deadtime Settings
Deadtime
therefore is:
mode
DT1
DT2
DT3
DT4
(Static) (zener bias)
>0.5mA
<10 k
3.3 k
5.6 k
8.2 k
R6
Figure 17: External Resistor
R6
R7
DDZ,
Vcc
COM
8.2 k
3.3 k
4.7k
Open
at static state conditions such as a condition with no PWM
DT
R7
DD
DD
IRS20954
supply current I
is 1.18 mA. A condition using 50 V power supply
0.71·(V
0.46·(V
0.29·(V
1.0·(V
voltage
DT/SD
DD
cc
cc
cc
cc
)
)
)
)
can be estimated by:
IRS20954S
18

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