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參數(shù)資料
| 型號： | IRS20124S |
| 廠商： | International Rectifier |
| 英文描述： | DIGITAL AUDIO DRIVER WITH DISCRETE DEAD-TIME AND PROTECTION |
| 中文描述： | 數(shù)字音頻驅(qū)動與離散死區(qū)時間和保護(hù) |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 218K |
| 代理商： | IRS20124S |
www.irf.com
23
IRS20124S(PbF)
Figure 12. External Resistor Network to set OC
Threshold
Vcc
COM
OC
SET1
>0.5mA
R3
R4
R5
OC
SET2
How to set OC Threshold
The positive and negative trip thresholds for bi-
directional current sensing are set by the voltages
at OC
SET1
and OC
SET2
. Fig.14 shows a typical re-
sistor voltage divider that can. be used to set
OC
SET1
and OC
SET2
.
The trip threshold voltages, V
SOC+
and V
SOC+,
are
determined by the required trip current levels, I
TRIP+
and
I
TRIP-
, and R
DS(ON)
in the low side MOSFET.
Since the sensed voltage of Vs is shifted up by
2.21V internally and compared with the voltages
fed to the OC
SET1
and OC
SET2
pins, the required
value of OC
SET1
with respect to COM is
V
OCSET1
= V
SOC+
+ 2.21 = I
TRIP+
x R
DS(ON)
+ 2.21
The same relation holds between OC
SET2
and V
SOC-,
V
OCSET2
= V
SOC-
+ 2.21 = I
TRIP-
x R
DS(ON)
+ 2.21
In general, R
has a positive temperature co-
efficient that needs to be considered when the
threshold level is being set. Please also note that,
in the negative load current direction, the sensing
voltage at the Vs node is limited by the body di-
ode of the low side MOSFET as explained later.
Design Example
This example demonstrates how to use the ex-
ternal resistor network to set I
TRIP+
and I
TRIP-
to
be ±11A, using a MOSFET that has R
DS(ON)
=6
0mù.
V
ISET1
= V
TH
+ + 2.21 = I
TRIP+
x R
DS(ON)
+ 2.21= 11
x 60mù +2.21 = 2.87V
V
ISET2
= V
TH-
+ 2.21 = I
TRIP-
x R
DS(ON)
+ 2.21= (-11)
x 60mù +2.21 = 1.55V
The total resistance of resistor network is based
on the voltage at the Vcc and required bias cur-
rent in this resistor network.
R
total
=R3 + R4 + R5 = Vcc / I
bias
= 12V / 1mA = 12Kù
The expected voltage across R3 is Vcc- V
ISET1
= 12-2.87=9.13V. Similarly, the voltages across
R4 is V
SOC+
- V
SOC-
= 2.87-1.55=1.32V, and the
voltage across R5 is V
ISET2
= 1.55V respectively.
R3 =9.13V/ I
bias
= 9.13Kù
R4 =1.32V/ I
bias
= 1.32Kù
R5 =1.55V/ I
bias
= 1.55Kù
Choose R3= 9.09Kù, R4=1.33Kù, R5=1.54Kù
from E-96 series.
Consequently, actual threshold levels are
V
SOC+
=2.88V gives I
TRIP+
= 11.2A
V
SOC-
=1.55V gives I
TRIP-
= -11.0A
Resisters with 1% tolerances are recommended.
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