3936 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – DMOS THREE-PHASE PWM MOTOR DRIVER

3936
DMOS THREE-PHASE
PWM MOTOR DRIVER
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Load Supply Voltage, V_BB ........................... 50 V
Output Current, I_OUT................................... ±3 A*
Logic Supply Voltage, V_DD......................... 7.0 V
Logic Input Voltage Range, V_IN
(t_W>30 ns) .......... -0.3 V to V_DD + 0.3 V
(t_W<30 ns) ................ -1.0V to V_DD +1V
Sense Voltage, V_SENSE................................. 0.5 V
Reference Voltage, V_REF ................................ V_DD
Package Power Dissipation,
P_D ............................................... 3.9 W
Operating Temperature Range,
T_A ................................ -20°C to +85°C
Junction Temperature, T_J ......................... +150°C
Storage Temperature Range,
T_S............................... -55°C to +150°C
* Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any set of
conditions, do not exceed the specified current rating or a
junction temperature of 150°C.
Designed for pulse-width modulated (PWM) current control of three-
phase brushless dc motors, the A3936SED is capable of peak output currents
to ± 3 A and operating voltages to 50 V. Internal fixed off-time PWM current-
control timing circuitry can be configured to operate in slow-, fast- and mixed-
decay modes.
Internal synchronous rectification control circuitry is provided to
improve power dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with
hysteresis, and crossover current protection. Special power up sequencing is
not required.
The A3936 is supplied in a 44-pin plastic PLCC with a copper
batwing tabs (suffix ‘ED’). The power tabs are at ground potential and need
no electrical isolation. This device is also available in a lead-free version
(100% matte tin leadframe).
Features
±3 A, 50 V Continuous Output Rating
Low r_DS(on) Outputs (typically 500 mΩ source, 315 mΩ sink)
Configurable Mixed, Fast and Slow Current-Decay Modes
Synchronous Rectification for Low Power Dissipation
Internal UVLO and Thermal Shutdown Circuitry
Crossover-Current Protection
Tachometer Output for External Speed Control Loop
A3936-DS Rev. 1
Always order by complete part number
Part Number
Package
A3936SED
44-pin PLCC
A3936SED-T
44-pin PLCC, Lead-free