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ISL62381, ISL62382, ISL62383, ISL62381C, ISL62382C, ISL62383C
FN6665 Rev 6.00 Page 17 of 24
October 23, 2015
Resistor ROCSET and capacitor CSEN form an RC network to
sense the inductor current. To sense the inductor current
correctly, not only in DC operation but also during dynamic
operation, the RC network time constant ROCSETCSEN needs
to match the inductor time constant L/DCR. The value of CSEN
is then written as Equation 10:
For example, if L is 1.5µH, DCR is 4.5m, and ROCSET is 9k
the choice of CSEN = 1.5µH/(9kx 4.5m) = 0.037µF
Upon converter start-up, the CSEN capacitor bias is 0V. To
prevent false OCP during this time, a 10µA current source
flows out of the ISEN1 pin, generating a voltage drop on the
RO resistor, which should be chosen to have the same
resistance as ROCSET
. When PGOOD pin goes high, the
ISEN1 pin current source will be removed.
When an OCP fault is declared, the PGOOD pin will pull-down
to 32and latch off the converter. The fault will remain latched
until the EN pin has been pulled below the falling EN threshold
voltage, or until VIN has decayed below the falling POR
threshold.
When using a discrete current sense resistor, inductor
time-constant matching is not required. Equation 7 remains
unchanged, but Equation 8 is modified in Equation 11:
Furthermore, Equation 9 is changed in Equation 12:
Where RSENSE is the series power resistor for sensing
inductor current. For example, with an RSENSE = 1m and an
OCP target of 10A, ROCSET = 1k
Overvoltage Protection
The OVP fault detection circuit triggers after the FB pin voltage
is above the rising overvoltage threshold for more than 2µs.
The FB pin voltage is 0.6V in normal operation. The rising over
voltage threshold is typically 116% of that value, or 1.16*0.6V =
0.696V.
When an OVP fault is declared, the PGOOD pin will pull down
with 65and latch-off the converter. The OVP fault will remain
latched until the EN pin has been pulled below the falling EN
threshold voltage, or until VIN has decayed below the falling
POR threshold.
For ISL62381, ISL62381C, ISL62383 and ISL62383C,
although the converter has latched-off in response to an OVP
fault, the LGATE gate-driver output will retain the ability to
toggle the low-side MOSFET on and off in response to the
output voltage transversing the OVP rising and falling
thresholds. The LGATE gate-driver will turn on the low-side
MOSFET to discharge the output voltage, thus protecting the
load from potentially damaging voltage levels. The LGATE
gate-driver will turn off the low-side MOSFET once the FB pin
voltage is lower than the falling overvoltage threshold for more
than 2µs. The falling overvoltage threshold is typically 106% of
the reference voltage, or 1.06*0.6V = 0.636V. This process
repeats as long as the output voltage fault is present, allowing
the ISL62381, ISL62381C, ISL62383 and ISL62383C to
protect against persistent overvoltage conditions.
For ISL62382 and ISL62382C, if OVP is detected, it simply tri-
states the PHASE node by turning UGATE and LGATE off.
Undervoltage Protection
The UVP fault detection circuit triggers after the FB pin voltage
is below the undervoltage threshold for more than 2µs. The
undervoltage threshold is typically 86% of the reference
voltage, or 0.86*0.6V = 0.516V. If a UVP fault is declared, and
the PGOOD pin will pull-down with 93and latch-off the
converter. The fault will remain latched until the EN pin has
been pulled below the falling enable threshold, or if VIN has
decayed below the falling POR threshold.
Programming the Output Voltage
When the converter is in regulation, there will be 0.6V between
the FB and GND pins. Connect a two-resistor voltage divider
across the OUT and GND pins with the output node connected
to the FB pin, as shown in Figure 27. Scale the voltage-divider
network such that the FB pin is 0.6V with respect to the GND
pin when the converter is regulating at the desired output
voltage. The output voltage can be programmed from 0.6V to
5.5V.
Programming the output voltage is written as Equation 13:
Where:
-V
OUT is the desired output voltage of the converter
- The voltage to which the converter regulates the FB pin is
the VREF (0.6V)
-R
TOP is the voltage-programming resistor that connects
from the FB pin to the converter output. In addition to
setting the output voltage, this resistor is part of the loop
compensation network
-R
BOTTOM is the voltage-programming resistor that
connects from the FB pin to the GND pin
Choose RTOP first when compensating the control loop, and
then calculate RBOTTOM according to Equation 14:
Compensation Design
Figure 27 shows the recommended Type-II compensation circuit.
The FB pin is the inverting input of the error amplifier. The COMP
signal, the output of the error amplifier, is inside the chip and
unavailable to users. CINT is a 100pF capacitor integrated inside
the IC that connects across the FB pin and the COMP signal.
(EQ. 10)
CSEN
L
ROCSET DCR
-----------------------------------------
=
VOCSET1 V–ISEN1 ILRSENSE
10AR
OCSET
–= (EQ. 11)
ROCSET
IOC RSENSE
10A
-------------------------------------
=(EQ. 12)
VOUT VREF 1
RTOP
RBOTTOM
-----------------------------
+
=(EQ. 13)
RBOTTOM
VREF RTOP
VOUT VREF
–
-------------------------------------
=(EQ. 14)