mc33899vwr2 Freescale Semiconductor, Inc, mc33899vwr2 Datasheet - Page 17

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

H-BRIDGE OUTPUT DRIVERS (S0 AND S1)
drive a DC motor in both forward and reverse shaft rotation
via a monolithic H-Bridge comprising low R
MOSFETs and integrated control circuitry. The switching
action of the H-Bridge can be pulse-width modulated to
obtain both torque and speed control, with PWM frequencies
up to 11 kHz supported with minimal switching losses.
a standard H-Bridge, controlled by the PWM input and the
FWD and REV inputs.
ANALOG CONTROL AND PROTECTION
the logic and protection functions internally. This reduces the
requirements for external supplies and insures the device is
safely controlled at all times when battery voltage is applied.
levels to insure the output MOSFETs turn fully ON when
commanded.
circuitry by way of a current sensor. Each sense signal is
compared with programmable over-current levels and
produces an immediate shutdown in case of a high current
short circuit. The low-side current sense is also capable of
producing a current limiting PWM to reduce overload
conditions as determined by the programmable limits. The
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33899 Power IC provides the means to efficiently
The outputs comprise four Power MOSFETs configured as
The 33899 has integrated voltage regulators which supply
An integrated charge pump provides the required bias
Each MOSFET provides feedback to the protection
Fault Registers
Command and
Current Sense
MCU Interface and Output Control
Temperature
SPI Interface
Analog Control and Protection
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Sense
DS(ON)
Figure 11. Functional Block Diagram
N-channel
PWM Controller
INTRODUCTION
Regulation
Direction
Charge
Control
Voltage
Pump
high-side current sense is available to the MCU as an analog
current proportional to the load current.
that disables the device. A thermal warning sets a flag in the
SPI register when the device is approaching a protection
limit.
MCU INTERFACE AND OUTPUT CONTROL
5V and 3.3V logic systems.
rate and current limits. The status register makes detailed
diagnostics available for protective and warning functions.
EN2, FWD, REV, and PWM.
are controlled by the PWM input when FWD is a logic [1] and
REV is a logic [0]. The low-side MOSFET connected to S1 is
idle in this state. The high-side MOSFET connected to S1 is
statically ON in the forward direction. The low-side and high-
side MOSFETs connected to S1 are controlled by the PWM
input when FWD is a logic [0] and REV is a logic [1]. The low-
side MOSFET connected to S0 is idle in this state. The high-
side MOSFET connected to S0 is statically ON in the reverse
direction. To reduce power during the recirculation period,
the upper recirculation MOSFET is turned on synchronously
with the OFF-time of the low-side MOSFET.
Each MOSFET has over-temperature protection circuitry
The SPI and control logic signals are compatible with both
The SPI provides programmable control of output slew
The output drivers are controlled by the input signals EN1,
The low-side and high-side MOSFETs connected to S0
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Output Drivers
H-Bridge
S0 - S1
INTRODUCTION
33899
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