參數(shù)資料
型號(hào)： HV302NG
廠商： SUPERTEX INC
元件分類： 電源管理
英文描述： Sequencing Hotswap Controllers
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
封裝： SOIC-14
文件頁(yè)數(shù)： 6/10頁(yè)
文件大?。?/td> 618K
代理商： HV302NG
6 Rev. D 04/17/02
HV302 / HV312
Design Information
Programming Under and Over Voltage Shut Down
The UV and OV pins are connected to comparators with nominal
1.21V thresholds and 100mV of hysteresis (1.21V
±
50mV). They
are used to detect under voltage and over voltage conditions at the
input to the circuit. Whenever the OV pin rises above its high
threshold (1.26V) or the UV pin falls below its low threshold
(1.16V) the GATE voltage is immediately pulled low, the PWRGD
pin changes to its inactive state and the external capacitor
connected to the RAMP pin is discharged.
Calculations can be based on either the desired input voltage
operating limits or the input voltage shutdown limits. In the
following equations the shutdown limits are assumed.
The under voltage and over voltage shut down thresholds can be
programmed by means of the three resistor divider formed by R1,
R2 and R3. Since the input currents on the UV and OV pins are
negligible the resistor values may be calculated as follows:
R3
R2
R3
R1
R3
+
R2
+
V
1.16
V
UV
EEUV(off)
UVL
OFF
+
×
=
=
=
R3
R2
R1
V
1.26
V
OV
EEOV(off)
OVH
OFF
+
+
×
=
=
=
Where
V
and
V
EEOV(off)
are Under & Over Voltage Shut
Down Threshold points.
If we select a divider current of 100
μ
A at a nominal operating input
voltage of 50 Volts then
50V
R3
R2
R1
=
=
+
+
500k
100uA
From the second equation for an OV shut down threshold of 65V
the value of R3 may be calculated.
R3
65
1.26
OV
OFF
=
=
500k
×
9.69k
65
500K
1.26
R3
=
×
=
The closest 1% value is 9.76k
From the first equation for a UV shut down threshold of 35V the
value of R2 can be calculated.
(
500K
500k
1.16
R2
=
)
R3
R2
35
1.16
UV
OFF
+
×
=
=
6.81k
9.76k
35
=
×
The closest 1% value is 6.81k
Then
500K
R1
=
The closest 1% value is 487k
483k
R3
R2
=
Under Voltage/Over Voltage Operation
From the calculated resistor values the OV and UV start up
threshold voltages can be calculated as follows:
R3
R2
R1
R3
+
R2
+
V
1.26
V
UV
EEUV(on)
UVH
ON
+
×
=
=
=
R3
R2
R1
R3
V
1.16
V
OV
EEOV(on)
OVL
ON
+
+
×
=
=
=
Where
V
EEUV(on)
and
V
EEOV(on)
are Under & Over Voltage Start
Up Threshold points.
Then
R2
R1
1.26
V
EEUV(on)
+
6.81k
487k
1.26
V
EEUV(on)
×
=
R3
R2
R3
+
+
×
=
38.29V
9.76k
6.81k
9.76k
=
+
+
+
And
R3
R3
R2
R1
1.16
V
EEOV(on)
+
+
×
=
59.85V
9.76k
9.76k
6.81k
487k
1.16
V
EEOV(on)
=
+
+
×
=
Therefore, the circuit will start when the input supply voltage is in
the range of 38.29V to 59.85V.
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 Fax: (408) 222-4895 www.supertex.com
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