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Appendix A: Hardware Reference Manual
protected through current limit and inductive clamping and can sense faults including open load and
output shorts. Control and feedback of the outputs is performed through a serial peripheral interface
(SPI). This common interface is connected to the SPI of the MCU.
As the MC33879 is a general purpose load driver, it is not optimized for stepper motor control. However,
simple accommodations in software allow it to work well with a stepper motor. For motor control,
dissipation of energy in an active coil is important before changing the direction of the current flow. This
is called dead-time insertion. For the implementation of the MC33879 as a stepper motor driver,
dead-time insertion must be handled manually through software. The result is the addition of new states
to the stepper motor state machine to prevent shoot-through that could lead to a system fault.
The configurable functionality of the MC33879 makes it a good choice for implementations other than a
dual H-bridge. Paralleling outputs can create a higher power device that drives loads requiring greater
than 0.6 A of current. This makes it possible to drive a DC motor if used for idle speed control or other
purposes. Other possibilities for loads include relays and LEDs.
10.4.6 Discrete Low-side Driver
10.4.6.1
Design Criteria
Provision must be made for driving unspecified loads in the system. These loads can be motors, relays,
lamps, LEDs, solenoids, or other high current devices. As the load may be an inductive type, flyback
voltage must suppressed on the output.
Implementation Recommendations
Two discrete low side drivers are implemented through two dual-channel NMOS transistors. These
control the O2HOUT and ROUT2 signals. Each dual-channel transistor is paired together to make a
single high power output. Additionally, the output has a 1500 W TVS to suppress transients that may
occur on the unspecified load.
This is a generic implementation for a discrete low side driver. Optimization of the circuit begins with sizing
the transistor to match a specific system load. The same should be performed with the transient
suppressor. Components of the discrete low side driver are quite large and selected based on the high
drive current beyond a normal application demand. Specific implementations may also take into account
current feedback and fault detection through analog measurement. This combined with over-current
protection would create a low side driver that is much more capable for a specific application.
10.4.7 Discrete IGBT Driver
10.4.7.1
Design Criteria
The IGBT must be capable of carrying greater than 2.0 A and have a breakdown of at least 400 V to drive
the example inductive ignition system. Packaging must be small and cost effective. Device must maintain
minimum operating characteristics over temperature.
Implementation Recommendations
A small TO-252 sized IGBT was selected capable of delivering 10 A with a breakdown voltage of 430 V.
The breakdown voltage for an example ignition system was found to be 420 V. This parameter is
dependent on the actual system it is implemented on and a device with appropriate performance
selected. Power dissipation is a large concern for the IGBT. Worst case operating conditions should be
considered for power dissipation to validate the use of the selected component package.
Small Engine Reference Design User Manual , Rev. 3.0
Freescale Semiconductor
53
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