NCV7721D2R2G

NCV7721
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10
Underload Detection
The underload detection circuit monitors the current from
each output driver. A minimum load current (this is the
maximum open circuit detection threshold) is required when
the drivers are turned on. If the underload detection
threshold has been detected continuously for more than the
underload delay time, FLTB will report a low. There is no
change to the driver condition (remains in the active state).
The fault can be cleared by a toggle of the EN pin or a power
on reset of VCC.
The NCV7721 uses a global underload timer. An under
load condition starts the global under load delay timer. If
under load occurs in another channel after the global timer
has been started, the delay for any subsequent underload will
be the remainder of the initially started timer. The timer runs
continuously with any persistent under load condition and
will impact the time for multi underload situations. Figures
9 and 10 highlight the timing conditions for an underload
state where the global timer is reset (discontinuous time) and
the conditions where the global timer is not reset
(continuous time).
Figure 9. Underload Discontinuous Time
OUTx
OUTy
FLTB
Time
If the 1
st
underload condition is <350 us,
the global timer resets and starts again
with the 2
nd
underload condition.
<350[us](typ)
load[mA]
7[mA](typ)
Underload Detection Threshold
Global Timer
resets
here
>350[us](typ)
Figure 10. Underload Continuous Time
OUTx
OUTy
After a total continuous period is more than 350[us] (typ)
(underload detection time), Bit 14 in the output register is set
FLTB
Time
load[mA]
7[mA](typ)
Underload Detection Threshold
350[us](typ)
NCV7721
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11
ENABLE
A single enable input (EN) provides on and off control for
the two half−bridge outputs and activation of the fault
reporting FLTB pin. The EN input has a logic level input
threshold. A high on EN enables both outputs (OUT1 &
OUT2). The outputs will become active in the state which is
represented by the respective input pins (IN1 & IN2).
Input Control
IN1 & IN2 are both logic level inputs which are active
with EN high. A low on IN1 or IN2 with EN high activates
the low−side drivers of OUT1 or OUT2. A high on IN1 or
IN2 with EN high activates the high−side drivers of OUT1
or OUT2.
Fault Reporting
Fault reporting is carried out through the open−drain
FLTB pin. A pull−up resistor is required for operation. The
FLTB pin has a maximum voltage of 5.5 V. In normal
operation, FLTB reports a high signal. During a fault, the
FLTB pin will go low and stay low. FLTB reporting is
cleared by a toggle of the EN input or a power−on reset of
VCC.
There are 3 faults reported by FLTB
1. Underload
2. Overcurrent
3. Thermal Shutdown
Undervoltage lockout and overvoltage lockout are NOT
reported on FLTB.
Thermal Shutdown
Thermal Shutdown uses one common sensor for each HS
and LS transistor pair. If the IC temperature reaches Over
Temperature Shutdown, all drivers are latched off and FLTB
will report a low. It can be reset only after the part cools
below the shutdown temperature, including thermal
hysteresis. The driver can be turned back on by a toggle of
the EN pin or a power on reset of VCC.
Table 4. LOGIC TABLE
EN IN1 IN2 OUT1 OUT2
0 0 0 Off Off
0 0 1 Off Off
0 1 0 Off Off
0 1 1 Off Off
1 0 0 Low Low
1 0 1 Low High
1 1 0 High Low
1 1 1 High High
Table 5. FAULT TABLE
Fault FLTB
Driver Condition
During Fault
Driver Condition after Parameters
Within Specified Limits
FLTB Clear Requirement
No Fault High Output Driver on Output Driver on N/A
Underload (7 mA) Low unchanged unchanged EN toggle or VCC POR
Overcurrent Low Offending Driver is latched
off after 25 ms
Offending Driver is latched off EN toggle or VCC POR
Thermal Shutdown Low All Drivers latched off at 175°C All Drivers latched off EN toggle or VCC POR
NCV7721
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12
PACKAGE DIMENSIONS
SOIC−14 NB
CASE 751A−03
ISSUE L
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION
SHALL BE 0.13 TOTAL IN EXCESS OF AT
MAXIMUM MATERIAL CONDITION.
4. DIMENSIONS D AND E DO NOT INCLUDE
MOLD PROTRUSIONS.
5. MAXIMUM MOLD PROTRUSION 0.15 PER
SIDE.
H
14
8
71
M
0.25 B
M
C
h
X 45
SEATING
PLANE
A1
A
M
_
S
A
M
0.25 B
S
C
b
13X
B
A
E
D
e
DETAIL A
L
A3
DETAIL A
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
D 8.55 8.75 0.337 0.344
E 3.80 4.00 0.150 0.157
A 1.35 1.75 0.054 0.068
b 0.35 0.49 0.014 0.019
L 0.40 1.25 0.016 0.049
e 1.27 BSC 0.050 BSC
A3 0.19 0.25 0.008 0.010
A1 0.10 0.25 0.004 0.010
M 0 7 0 7
H 5.80 6.20 0.228 0.244
h 0.25 0.50 0.010 0.019
__ __
6.50
14X
0.58
14X
1.18
1.27
DIMENSIONS: MILLIMETERS
1
PITCH
SOLDERING FOOTPRINT*
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
0.10
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NCV7721D2R2G

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Gate Drivers AUTOMOTIVE DRIVER
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