Analog Integrated Circuit Device Data

Freescale Semiconductor

9

33395

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 33395 and 33395T devices are designed to provide

the necessary drive and control signal buffering and

amplification to enable a DSP or MCU to control a three-

phase array of power MOSFETs such as would be required

to energize the windings of powerful brushless DC (BLDC)

motors. It contains built-in charge pump circuitry so that the

MOSFET array may consist entirely of N-Channel

MOSFETs. It also contains feedback sensing circuitry and

control circuitry to provide a robust overall motor control

design.

FUNCTIONAL PIN DESCRIPTION

CHARGE PUMP CAPACITOR (CP2H)

High potential pin connection for secondary charge pump

capacitor

CHARGE PUMP RESERVE CAPACITOR (CPRES)

Input from external reservoir capacitor for charge pump

INPUT VOLTAGE (VIGN)

Input from ignition level supply voltage for power functions

HIGH-SIDE GATE VOLTAGE (VGDH)

Output full-time gate drive for auxiliary high-side power

MOSFET switch

INPUT VOLTAGE PROTECTED (VIGNP)

Input from protected ignition level supply for power

functions

HIGH-SIDE SENSE (SRC1, SRC2, SRC3)

Sense for high-side source voltage, phase 1/2/3

GATE DRIVE HIGH (GDH1, GDH2, GDH3)

Output for gate high-side, phase 1/2/3

OUTPUT FOR GATE (GDL1, GDL2, GDL3)

Output for gate drive low-side, phase 1

POWER GROUND (PGND)

Ground pins for power functions

TEST PIN (TEST)

This should be connected to ground or left open

IS MINUS (-ISENS)

Inverting input for current limit comparator

IS PLUS (+ISENS)

Non-Inverting input for current limit comparator

ANALOG GROUND (AGND)

Ground pin for logic functions

LOGIC SUPPLY VOLTAGE (VDD)

Supply voltage for logic functions

PULSE WIDTH MODULATOR (PWM)

Input for pulse width modulated driver duty cycle

MODE CONTROL BIT 1 (MODE1)

Input for mode control selection

MODE CONTROL BIT 0 (MODE0)

Input for mode control selection

HIGH-SIDE ENABLE (HSE3, HSE2, HSE1)

Input for high-side enable logic, phase 1/2/3

LOW-SIDE ENABLE (LSE3, LSE2, LSE1)

Input for low-side enable logic, phase 1/2/3

EXTERNAL PUMP CAPACITOR (CP1L, CP1H)

Input from external pump capacitor for charge pump and

secondary pins

CHARGE PUMP CAPACITOR (CP2L)

Input from external reservoir, external pump capacitors for

charge pump, and secondary pins