參數(shù)資料
型號(hào): IRS20954STRPBF
廠商: International Rectifier
英文描述: Protected Digital Audio Driver
中文描述: 受保護(hù)的數(shù)字音頻驅(qū)動(dòng)程序
文件頁(yè)數(shù): 18/25頁(yè)
文件大?。?/td> 585K
代理商: IRS20954STRPBF
IRS20954S
www.irf.com
18
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.
Vcc
COM
DT
>0.5mA
R6
R7
IRS20954
Figure 17: External Resistor
Deadtime
mode
DT1
DT2
DT3
DT4
Table 1: Suggested Resistor Values for Deadtime Settings
R6
R7
DT/SD
voltage
1.0·(V
cc
)
0.71·(V
cc
)
0.46·(V
cc
)
0.29·(V
cc
)
<10 k
3.3 k
5.6 k
8.2 k
Open
8.2 k
4.7k
3.3 k
Power Supply Considerations
Supplying V
DD
V
DD
is designed to be supplied with the internal zener diode clamp. V
DD
supply current I
DD
can be estimated by:
I
DD
= 1.5 mA x 300 x 10
-9
x switching frequency + 0.5 mA + 0.5 mA
(Dynamic power consumption) (Static) (zener bias)
The resistance of R
dd
to feed this I
DD
therefore is:
V
V
Rdd
DD
B
I
8
10
+
[
]
In case of 400 kHz average PWM switching frequency, the required I
DD
is 1.18 mA. A condition using 50 V power supply
voltage yields Rdd=33 k
.
Make sure I
DD
is below the maximum zener diode bias current, I
DDZ,
at static state conditions such as a condition with no PWM
input.
V
V
I
DDZ
5
mA
Rdd
B
8
10
+
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