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MAX6495 Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX6495
Description  72V, Overvoltage-Protection Switches/Limiter Controllers with an External MOSFET
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6495 Datasheet(HTML) 8 Page - Maxim Integrated Products

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The gate cycles during overvoltage-limit and overvolt-
age-switch modes are quite similar but have distinct
characteristics. In overvoltage-switch mode, GATE is
enhanced to (VIN + 10V) while the monitored VIN volt-
age remains below the overvoltage fault threshold
(OVSET < VTH+). When an overvoltage fault occurs
(OVSET
≥ VTH+), GATE is pulled one diode drop below
OUTFB, turning off the external MOSFET and discon-
necting the load from the input. GATE remains low
(MOSFET off) as long as the VIN voltage is above the
overvoltage fault threshold. As VIN falls back below the
overvoltage fault threshold, GATE is again enhanced to
(VIN + 10V).
In overvoltage-limit mode, GATE is enhanced to (VIN
+10V) while the monitored OUTFB voltage remains
below the overvoltage fault threshold (OVSET < VTH+).
When an overvoltage fault occurs (OVSET
≥ VTH+),
GATE is pulled one diode drop below OUTFB until
OUTFB drops 5% below the overvoltage fault threshold
(MAX6495/MAX6496/MAX6499). GATE is then turned
back on until OUTFB reaches the overvoltage fault
threshold and GATE is again turned off. GATE cycles in
a sawtooth waveform until OUTFB remains below the
overvoltage fault threshold and GATE remains con-
stantly on (VIN +10V). The overvoltage limiter’s saw-
tooth GATE output operates the MOSFET in a
switched-linear mode while the input voltage remains
above the overvoltage fault threshold. The sawtooth fre-
quency depends on the load capacitance, load current,
and MOSFET turn-on time (GATE charge current and
GATE capacitance).
GATE goes high when the following startup conditions
are met: VIN is above the UVLO threshold, SHDN is
high, an overvoltage fault is not present, and the device
is not in thermal shutdown.
Undervoltage Monitoring (MAX6499)
The MAX6499 includes undervoltage and overvoltage
comparators for window detection (see Figures 3 and
12). GATE is enhanced and the n-channel MOSFET is
on when the monitored voltage is within the selected
“window.” When the monitored voltage falls below the
lower limit (VTRIPLOW) or exceeds the upper limit
(VTRIPHIGH) of the window, GATE falls to OUTFB turn-
ing off the MOSFET. The application in Figure 3 shows
the MAX6499 enabling the DC-DC converter when the
monitored voltage is in the selected window.
The resistor values R1, R2, and R3 can be calculated
as follows:
where RTOTAL = R1 + R2 + R3.
Use the following steps to determine the values for R1,
R2, and R3:
1) Choose a value for RTOTAL, the sum of R1, R2, and
R3. Because the MAX6499 has very high input
impedance, RTOTAL can be up to 5MΩ.
2) Calculate R3 based on RTOTAL and the desired
upper trip point:
3) Calculate R2 based on RTOTAL, R3, and the desired
lower trip point:
4) Calculate R1 based on RTOTAL, R2, and R3:
R1 = RTOTAL – R2 – R3
To improve ESD protection, keep R3
≥ 1kΩ.
R
VR
V
R
TH
TOTAL
TRIPLOW
23
= ()
×
R
VR
V
TH
TOTAL
TRIPHIGH
3
=
×
+
VV
R
RR
VV
R
R
TRIPLOW
TH
TOTAL
TRIPHIGH
TH
TOTAL
=
()
+
⎝⎜
⎠⎟
=
()
⎝⎜
⎠⎟
+
23
3
72V, Overvoltage-Protection Switches/
Limiter Controllers with an External MOSFET
8
_______________________________________________________________________________________
OVSET
GND
CLEAR
GATE
OUTFB
IN
SHDN
UVSET
R2
VIN
R3
R1
MAX6499
DC-DC
CONVERTER
GND
IN
OUT
Figure 3. MAX6499 Window-Detector Circuit


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