HV7800K1-G 데이터 시트보기 (PDF) - Supertex Inc
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HV7800K1-G Datasheet PDF : 7 Pages
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HV7800
A trace or component inductance of just 10nH contributes
an impedance of 6.2mΩ at 100kHz, which constitutes a 6%
error when using a 100mΩ sense resistor.
shows the orientation of this diode. The Zener diode provides
clamping at 5.0V for a positive VSENSE and at 600mV for a
negative VSENSE.
Transient Protection
Add a protection resistor (RP) in series with the LOAD pin
if VSENSE can exceed 5.0V in a positive sense or 600mV in
a negative sense, whether in a steady state or in transient
conditions.
A large VSENSE may occur during system startup or shutdown
due to the charging and discharging of bulk storage
capacitors. VSENSE may be large due to fault conditions, such
as a short circuit condition, or a broken or missing sense
resistor.
An internal 5.0V Zener diode with a current rating of 10mA
protects the sense amplifier inputs. The block diagram
Under worst case conditions, limit the Zener current to 10mA.
A 100kΩ resistor limits the Zener diode current to 4.5mA
when VSENSE is 450V, whether positive or negative. Note that
the protection resistor may affect the bandwidth. The resistor
forms a RC network with the trace and pin capacitance at the
LOAD pin. A capacitance of 5.0pF results in a time constant
of 500ns.
The protection resistor may cause an offset due to bias
current at the LOAD input. Under worst case bias current
(1.0nA), a 100kΩ protection resistor could cause an offset
of 100µV or 0.2% of full scale. Note that the bias current
is nominally zero as the LOAD is a high impedance CMOS
input.
Pin Description
Pin #
Pin Name
1
LOAD
2
NC
3
IN
4
GND
5
OUT
Description
Sense amplifier input. High impedance input with Zener diode protection. Add an external
protection resistor in series with LOAD if VSENSE exceeds the range of -600mV to +5V.
No connect. This pin must be left floating for proper operation.
Sense amplifier input and supply.
Supply return.
Output with a nominal output resistance of 3.6kΩ. Preservation of accuracy may require
an external buffer amplifier to prevent excessive loading.
Doc.# DSFP-HV7800
A062813
Supertex inc.
6
www.supertex.com
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