MC33883HEG FREESCALE [Freescale Semiconductor, Inc], MC33883HEG Datasheet - Page 16

• Manufacturer Part Number: MC33883HEG
• Description: H-Bridge Gate Driver IC
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

GATE PROTECTION
regulator. The high-side driver is supplied from the internal
charge pump buffered at CP_OUT.
regulator, which ensures that V
maximum V
pump, the voltage at CP_OUT can be up to 65 V. The high-
side gate is clamped internally in order to avoid a V
exceeding 18 V.
that protects the driver and the external MOSFET from a fly-
back voltage that can occur when driving inductive load. This
fly-back voltage can reach high negative voltage values and
needs to be clamped externally, as shown in
16
33883
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSTIC FEATURES
Figure 12. Gate Protection and Flyback Voltage Clamp
The low-side driver is supplied from the built-in low-drop
The low-side gate is protected by the internal linear
Gate protection does not include a fly-back voltage clamp
LR_OUT
IN
IN
GS
Output
Output
Driver
Driver
. Especially when working with the charge
CP_OUT
OUT
OUT
GATE_HS
SRC_HS
GATE_LS
D
c l
GATE_LS
M
M
PROTECTION AND DIAGNOSTIC FEATURES
1
2
does not exceed the
L
1
Flyback Voltage
Figure
V
Inductive
Conditions
Under All
Clamp
GS
GS
V
< 14 V
12.
CC
LOAD DUMP AND REVERSE BATTERY
double battery of 24 V. Protection against reverse polarity is
ensured by the external power MOSFET with the free-
wheeling diodes forming a conducting pass from ground to
V
To protect the circuit an external diode can be put on the
battery line. It is not recommended putting the diode on the
ground line.
TEMPERATURE PROTECTION
bridge. Temperature shutdown protects the circuitry against
temperature damage by switching off the output drivers. Its
typical value is 175°C with an hysteresis of 15°C.
DV/DT AT V
a diode drop voltage) to avoid perturbation of the high-side
driver.
sudden changes at V
flowing through pin C1, as shown in
minimum peak current, I
t
current, I
600 ns. Current sourced by pin C1 during a large dV / dt will
result in a negative voltage at pin C1
minimum peak voltage V
duration of t
pump capacitor (Ccp) capacitor can be added in order to limit
the surge current.
C1
CC
V
There is temperature shutdown protection per each half-
V
In some applications a large dV / dt at pin C2 owing to
For positive transitions at pin C2, the absolute value of the
For negative transitions at pin C2, the maximum peak
min duration of 600 ns.
CC
. Additional protection is not provided within the circuit.
CC
and V
voltage must be higher than (SRC_HS voltage minus
C1
max, is specified at 2.0 A for a t
C1
CC2
CC
max = 600 ns. A series resistor with the charge
can sustain load a dump pulse of 40 V and
CC
Analog Integrated Circuit Device Data
can cause large peak currents
C1
C1
min, is specified at 2.0 A for a
min is specified at -1.5 V for a
Freescale Semiconductor
Figure
(Figure
C1
13.
max duration of
13). The