MC34937 Datasheet, PDF (1/49 Pages) Freescale Semiconductor, Inc – Three Phase Field Effect Transistor Pre-driver

Freescale Semiconductor
Technical Data
Document Number: MC34937
Rev. 2.0, 9/2013
Three Phase Field Effect
Transistor Pre-driver
The 34937A is a field effect transistor (FET) pre-drivers designed
for three phase motor control and similar applications. The integrated
circuit (IC) uses SMARTMOS technology.
The IC contains three high side FET pre-drivers and three low side
FET pre-drivers. Three external bootstrap capacitors provide gate
charge to the high side FETs.
The IC interfaces to a MCU via six direct input control signals, an
SPI port for device setup and asynchronous reset, enable and
interrupt signals. Both 5.0 and 3.0 V logic level inputs are accepted
and 5.0 V logic level outputs are provided.
34937A
Industrial
THREE PHASE PRE-DRIVER
Features
• Extended supply voltage operating range: 6.0 to 58 V
• Wide dead time range (50 ns to 12 s) programmable via the SPI
port
• External FET gate drive capability of >1.0 A with protection
• Charge pump ensures sufficient external FET drive at low supply
voltages
• Device protection against reverse charge-injection from C_GD and
C_GS of external FETS
• Integrated overcurrent, desaturation, and phase fault-detection
• Immunity against positive or negative transient voltage spikes on
the gate driver
• Current shoot-through protection built into dead time control
• Supports direct 3.3 V and 5.0 V logic interface to MCUs
• Integrated current sensing amplifier
• Device configuration and diagnostics through the SPI
V_SYS
34937
VPUMP
VSUP
PUMP
VPWR
VLS
PA_HS_G
PB_HS_G
PC_HS_G
MCU
OR
DSP
VDD
PA_HS_S
VSS
PB_HS_S
PC_HS_S
3
3
PX_HS
PX_LS
3
PHASEX
PA_LS_G
CS
PB_LS_G
SI
PC_LS_G
SCLK
SO
PX_LS_S
RST
INT
EN1
EN2
AMP_P
AMP_N
GND AMP_OUT
EK SUFFIX (Pb-FREE)
98ASA99334D
54-PIN SOICW-EP
Applications
• 12 V - 48 V 3-phase brushless DC (BLDC) motors
and permanent magnet synchronous motors (PMSM)
• E-Bike, hospital beds, electric chair/scooter
• CPAPs, inflation pumps, industrial fans
• Portable power tools, commercial fans/blowers
• Small kitchen appliances
R_SEN
Figure 1. 34937A Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2013. All rights reserved.