3932
THREE-PHASE POWER
MOSFET CONTROLLER
The A3932SEQ is a three-phase MOSFET controller for use with bi-
polar brushless dc motors. Its high gate-current drive capability allows
driving a wide range of n-channel power MOSFETs and can support
motor supply voltages to 50 V. Bootstrapped high-side drive blocks
provide the floating positive supplies for the gate drive and minimize
the component count normally required. The high-side circuitry also
employs a unique FET monitoring circuit that ensures the gate voltages
are at the proper levels before turn-on and during the ON cycle.
5
29 SENSE
28 RC
GHC
CC
6
7
27
GLB
SB
PWM
8
26 TACH
25 SR
Internal fixed off-time PWM current-control circuitry can be used to
regulate the maximum load current to a desired value. The peak load-
current limit is set by the user’s selection of an input reference voltage
and external sensing resistor. The fixed off-time pulse duration is set by
a user-selected external RC timing network. For added flexibility, the
GHB
CB
9
10
11
12
13
BRAKE
24
23
GLA
SA
19 DIR
22 H2
21 H3
continued ...
GHA
FEATURES AND BENEFITS
■ Drives Wide Range of N-Channel MOSFETs
■ Synchronous Rectification
Dwg. PP-068-1
■ Power MOSFET Protection
■ Adjustable Dead Time for Cross-Conduction Protection
■ 100% Duty Cycle Operation
■ Selectable Fast or Slow Current-Decay Modes
■ Internal PWM Peak Current Control
■ High-Current Gate Drive
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
■ Motor Lead Short-to-Ground Protection
■ Internal 5-V Regulator
Supply Voltage, VBB .............................. 50 V
Peak Regulator Voltage, VREG ............... 15 V
■ Brake Input
Logic Input Voltage Range,
■ PWM Torque-Control Input
■ Fault-Diagnostic Output
VIN ................... -0.3 V to VLCAP + 0.3 V
Sense Voltage Range,
■ Tachometer Output
VSENSE ............................ -5 V to +1.5 V
Output Voltage Range,
■ Thermal Shutdown
VSA, VSB, VSC .................. -5 V to +50 V
VGHA, VGHB, VGHC .. -5 V to VBB + 17 V
VCA, VCB, VCC ..................... VSX + 17 V
■ Undervoltage Protection
Operating Temperature Range,
TA .................................. -20°C to +85°C
Junction Temperature, TJ .................. +150°C
Storage Temperature Range,
TS ............................... -55°C to +150°C