參數(shù)資料
型號(hào)： IRS20124STRPBF
廠商： International Rectifier
文件頁(yè)數(shù)： 15/27頁(yè)
文件大小： 0K
描述： IC DRIVER DGTL AUDIO 14-SOIC
標(biāo)準(zhǔn)包裝： 2,500
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： 帶卷 (TR)
www.irf.com
22
IRS20124S(PbF)
each MOSFET carries a part of the load current
in an audio cycle. Bi-directional current sensing
offers over current detection capabilities in both
cases by monitoring only the low side MOSFET.
Load Current
0
Bi-
Directional Current Sensing
IRS20124 has an over-current detection function
utilizing R
DS(ON) of the low side switch as a current
sensing shunt resistor. Due to the proprietary HVIC
process, the IRS20124 is able to sense negative
as well as positive current flow, enabling bi-direc-
tional load current sensing without the need for
any additional external passive components.
Direction in MOSFET Current and Load Current
vs
Vsoc+
Vsoc-
COM
~
~ ~
~
(a) Normal Operation
Condition
(b) Over- Current in
Positive Load Current
(c) Over- Current in
Negative Load Current
Vs Waveform in Over-Current Condition
IRS20124 measures the current during the period
when the low side MOSFET is turned on. Under
normal operating conditions, Vs voltage for the low
side switch is well within the trip threshold bound-
aries, V
SOC- and VSOC+. In the case of Fig. 9(b) which
demonstrates the amplifier sourcing too much cur-
rent to the load, the Vs node is found below the trip
level, V
SOC-. In Fig. 9(c) with opposite current direc-
tion, the amplifier sinks too much current from the
load, positioning Vs well above trip level, V
SOC+.
Once the voltage in Vs exceeds the preset thresh-
old, the OC pin pulls down to COM to detect an
over-current condition.
Since the switching waveform usually contains
over/under shoot and associated oscillatory arti-
facts on their transient edges, a 200 ns blanking
interval is inserted in the Vs voltage sensing block
at the instant the low side switch is engaged.
Because of this blanking interval, the OC function
will be unable to detect over current conditions if
the low side ON duration less than 200 ns.
OCSET1
OCSET2
Vs
LO
OC
+
-
OR
AND
Simplified Functional Block Diagram of
Bi-Directional Current Sensing
The bi-directional current sensing block has an
internal V level shifter feeding the signal to the
comparator. OC
SET1 sets the threshold, and is
given a trip level at V
SOC+, which is OCSET1 -V. In
the same way, for a given OC
SET2, VSOC- is set at
OC
SET2 -V.
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