參數(shù)資料
型號(hào)： IRS20124SPBF
廠商： International Rectifier
文件頁(yè)數(shù)： 14/27頁(yè)
文件大?。?/td> 0K
描述： IC DIGITAL AUDIO DRIVER 14-SOIC
標(biāo)準(zhǔn)包裝： 55
類型： MOSFET 驅(qū)動(dòng)器
應(yīng)用： 放大器，接收器
安裝類型： 表面貼裝
封裝/外殼： 14-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 14-SOIC（窄型）
包裝： 管件
www.irf.com
21
IRS20124S(PbF)
DT/SD pin
DT/SD pin provides two functions: 1) setting dead-
time and 2) shutdown. The IRS20124 determines
its operation mode based on the voltage applied
to the DT/SD pin. An internal comparator
translates which mode is being used by comparing
internal reference voltages. Threshold voltages for
each mode are set internally by a resistive voltage
divider off Vcc, negating the need of using a precise
absolute voltage to set the mode.
Vcc
0.89xVcc
0.57xVcc
0.36xVcc
0.23xVcc
Shutdown
45nS
35nS
25nS
15nS
Operational Mode
VDT
Dead-time
Deadtime Settings vs VDT Voltage
Design Example
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/SD
>0.5mA
R1
R2
IRS20124
Table 1. Suggested
Resistor Values for Deadtime
Settings
Shutdown
Since IRS20124 has internal deadtime generation,
independent inputs for HO and LO are no longer
provided. Shutdown mode is the only way to turn
off both MOSFETs simultaneously to protect them
from over current conditions. If the DT/SD pin de-
tects an input voltage below the threshold, V
DT4,
the IRS20124 will output 0 V at both HO and LO
outputs, forcing the switching output node to go
into a high impedance state.
Over Current Sensing
In order to protect the power MOSFET, IRS20124
has a feature to detect over-current conditions,
which can occur when speaker wires are shorted
together. The over-current shutdown feature can
be configured by combining the current sensing
function with the shutdown mode via the DT/SD pin.
Load Current Direction in Class D
Audio
Application
In a Class D audio amplifier, the direction of the
load current alternates according to the audio in-
put signal. An over current condition can therefore
happen during either a positive current cycle or a
negative current cycle. It should be noted that
External Resistor
Deadtime
mode
R1
()
R2
()
DT/SD
(V)
DT1
<10k
Open
1.00 (Vcc)
DT2
3.3k
8.2k
0.71 (Vcc)
DT3
5.6k
4.7k
0.46 (Vcc)
DT4
8.2k
3.3k
0.29 (Vcc)
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