MIC2588-2BMTR Micrel, MIC2588-2BMTR Datasheet - Page 13
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MIC2588-2BMTR
Manufacturer Part Number
MIC2588-2BMTR
Description
Semiconductors and Actives, ic, soic
Manufacturer
Micrel
Datasheet
1.MIC2588_2BM.pdf
(21 pages)
MIC2588/MIC2594
the OFF pin falls below its V
turns off due to a fault. Should either event occur, the GATE
pin is immediately pulled low and will remain low until the
ON pin once again exceeds its V
turn-on and turn-off points are set using the resistor divider
R1, R2, and R3 as shown in the “Typical Application.” The
equations to establish the trip points are shown below. In the
following example, the circuit’s nominal ON threshold is set to
V
V
Given V
two resistor values can be readily found. A suggested value
for R3 is that which will provide a minimum of 100µA of cur-
rent through the voltage divider chain at V
yields the following as a starting point:
The closest standard 1% value for R3 = 12.4kΩ.
solving for R2 and R1 yields:
M9999-083005
ON
OFF
= 40V and the circuit’s nominal OFF threshold is
= 35V.
V
V
R3 =
OFF
ON
OFF
, V
= V
V
= V
OFFL
ON
100 A
ONH
OFFL
, and any one resistor value, the remaining
(typ)
(typ)
(typ)
12.23k
R1 R2 R3
OFFL
R1 R2 R3
R2 R3
R3
ONH
threshold value, or the part
threshold. The circuit’s
DD
= V
OFF
. This
13
The closest standard 1% value for R2 = 1.78kΩ.
The closest standard 1% value for R1 = 392kΩ.
Using standard 1% resistor values, the circuit’s nominal
ON and OFF thresholds are:
Good general engineering design practices must consider
the tolerances associated with these parameters, including
but not limited to, power supply tolerance, undervoltgae
and overvoltage tolerances, and the tolerances of the
external passive components.
V
V
ON
OFF
R2 = R3
R2 = 12.4k
R2 = 1.771k
R1= R3
R1= 12.4k
R1= 391.380k
= 40.1V
= 35V
V
ON
V
V
OFF
1.223V
ON
40V – 1.223V
–1.223V
35V
40V
1.223V
– 1
– 1
– R2
– 1.78kΩ
September 2005
Micrel