mc33899vwr2 Freescale Semiconductor, Inc, mc33899vwr2 Datasheet - Page 19

• Manufacturer Part Number: mc33899vwr2
• Description: Programmable H-bridge Power Ic
• Manufacturer: Freescale Semiconductor, Inc

Short-to-GND or Short-to-VIGNP Fault Filtering
fault filter. After a single fault occurrence, another 7 shorts
consecutive with PWM must be detected before the bit is
latched into the fault register.
Short to -1.0 V on Output Devices
impedance (10 kHz to 1000 kHz) and a direct short to - 0.5 V
on all I/Os that exit the module. A shorted output to these
voltages does not impact correct fault diagnostics for the
effected channel or any other normal operation of the 33899.
This feature applies to the SO and S1 outputs as well.
Loss of Module Ground
pins of the 33899 see very low impedance to ignition. In the
application, a loss of ground condition results in all I/O pins
floating to ignition voltage V
referenced I/O pins are at worst case pulled to ground.
Loss of Module Ignition Supply
power input pins of the 33899 see infinite impedance to the
ignition supply voltage (depending on the application) but
there is some undefined impedance from these pins to
ground.
Output Driver Load(s)
load of up to 3.5 A of continuous average current (at a
maximum frequency of 11 kHz) with current feedback
capability. The 33899 drives ETC (Electronic Throttle
Control) motors. The typical characteristics of the ETC motor
are as follows:
Output Power Density
adequate thermal resistance to limit junction temperature to
150°C when the device is operated at 11 kHz, 3.5 A
continuous average current, and a 2.0 ms nominal transition
time. This applies to FR4 PC board with a metal pedestal
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33899 has a short-to-GND and short-to-VIGNP digital
The 33899 can survive a short to -1.0 V through a 300 mΩ
Loss of ground condition at the parts level denotes that all
Loss of ignition condition at the parts level denotes that the
The 33899 is capable of driving any PWM’ed inductive
•Resistance 1.25 Ω to 2.4 Ω (lumped resistance due to
•Inductance 800 µH at 1000 Hz over the temperature
The die area for the output MOSFETs provides an
actuator, harness, and connectors) over the
temperature range.
range.
IGNP
, while all externally
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
under the device, which provides a thermal path to the case
of the module.
Output Synchronous Rectification Control
power dissipation during the recirculation period. In order to
prevent shoot-through current, the 33899 has a dead time
circuit that turns on the upper recirculation MOSFET after the
lower gate voltage falls below the threshold voltage and turns
it off before the lower gate voltage rises above the threshold
voltage.
Output Overvoltage Shutdown
above the overvoltage shutdown threshold for a time period
greater than t
table,
Output Avalanche Protection
suddenly disabled and V
overstress of the drivers. To prevent this the V
the 33899 should not exceed 40 V during a fly-back
condition. A zener clamp and/or an appropriately valued
capacitor are common methods of limiting the transient.
Power-ON Reset (POR)
typically increase to 5.0 V and 3.3 V, respectively, within
0.3 ms to 3.0 ms. The 33899 has power-ON reset (POR)
circuitry that monitors both the VCC and VCCL voltages.
When either voltage falls below its POR threshold, the S0 and
S1 outputs are driven to the inactive state. When both
voltages rise above the POR threshold, the outputs are
enabled. During POR none of the outputs momentarily
glitches ON. The contents of all SPI registers (both DI and
DO) are cleared on each power-ON reset cycle. See
Input (V
normal operation.
Fault Detection
short circuit fault detection is performed while the H-Bridge
circuit(s) are enabled (see
user can determine whether an open circuit has caused the
output current to go to 0 A via the CSNS output. All valid
faults are latched into the SPI Fault register and cleared when
a logic [1] is written to the FLTCLR bit by the system
microprocessor (refer to
The 33899 uses synchronous rectification to reduce the
The 33899 disables all MOSFET outputs when V
An inductive fly-back event, namely when the outputs are
On power-up, the VCC and VCCL supplies to the 33899
Open load detection is performed in the OFF state, and
page
CCL
) on page 12
9).
OVS
(refer to
IGNP
Table
for part requirements to guarantee
Dynamic Electrical Characteristics
Figure
FUNCTIONAL DEVICE OPERATION
is lost, could result in electrical
8, page 22).
13, page 20). However, the
OPERATIONAL MODES
IGNP
input to
IGNP
+ 3.3 V
33899
is
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