33931 Datasheet, PDF (13/21 Pages) Freescale Semiconductor, Inc – 5.0 A Throttle Control H-bridge

FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
33931
CURRENT SENSE
VOLTAGE
REGULATION
TEMPERATURE
SENSE
CHARGE
PUMP
ANALOG CONTROL AND PROTECTION
PWM CONTROLLER
MCU
INTERFACE
COMMAND AND FAULT REGISTERS
PROTECTION LOGIC CONTROL
GATE CONTROL LOGIC
H-BRIDGE
OUTPUT DRIVERS
OUT1 - OUT2
Figure 10. Functional Internal Block Diagram
ANALOG CONTROL AND PROTECTION
CIRCUITRY:
An on-chip voltage regulator supplies the internal logic.
The charge pump provides gate drive for the H-bridge
MOSFETs. The Current and Temperature sense circuitry
provides detection and protection for the output drivers.
Output under-voltage protection shuts down the MOSFETS.
GATE CONTROL LOGIC:
The 33931 is a monolithic H-bridge Power IC designed
primarily for any low-voltage DC servo motor control
application within the current and voltage limits stated for the
device. Two independent inputs provide polarity control of
two half-bridge totem-pole outputs. Two independent disable
inputs are provided to force the H-bridge outputs to tri-state
(high-impedance off-state).
H-BRIDGE OUTPUT DRIVERS: OUT1 AND OUT2
The H-bridge is the power output stage. The current flow
from OUT1 to OUT2 is reversible and under full control of the
user by way of the Input Control Logic. The output stage is
designed to produce full load control under all system
conditions. All protective and control features are integrated
into the Control and Protection blocks. The sensors for
current and temperature are integrated directly into the
output MOSFET for maximum accuracy and dependability.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33931
13