33931 datasheet(13/21 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33931

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

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.

MCU

INTERFACE

33931

PROTECTION LOGIC CONTROL

COMMAND AND FAULT REGISTERS

GATE CONTROL LOGIC

CURRENT SENSE

VOLTAGE

REGULATION

TEMPERATURE

SENSE

CHARGE

PUMP

H-BRIDGE

OUTPUT DRIVERS

OUT1 - OUT2

ANALOG CONTROL AND PROTECTION

PWM CONTROLLER

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