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| A4915METTR-T Datasheet, PDF (1/17 Pages) Allegro MicroSystems – 3-Phase MOSFET Driver | |||
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A4915
3-Phase MOSFET Driver
Features and Benefits
⢠5 to 50 V supply voltage
⢠Latched TSD with fault output
⢠Drives six N-channel high current MOSFETs
⢠Internally controlled synchronous rectification
⢠Speed voltage input enables internal PWM duty cycle
control of full bridge
⢠Center aligned PWM
⢠Internal UVLO and crossover current protection
⢠Hall switch inputs
⢠Adjustable dead time protection
⢠Low power sleep mode for battery-powered applications
Packages:
28-pin TSSOP
with exposed thermal pad
(LP package)
28-contact QFN
5 mm à 5 mm à 0.90 mm
(ET package)
Description
The A4915 is designed for pulse width modulated (PWM)
current control of 3-phase brushless DC motors. The A4915
is capable of high current gate drive for 6 all N-channel power
MOSFETs. An internal charge pump ensures gate drive down
to 7 V supply and provides limited gate drive down to 5 V. A
bootstrap capacitor is used to generate a supply voltage greater
than the source voltage of the high side MOSFET, required
for N-channel MOSFETs.
Internal synchronous rectification control circuitry is provided
to improve power dissipation in the external MOSFETs during
PWM operation. Internal circuit protection includes latched
thermal shutdown, dead time protection, and undervoltage
lockout. Special power up sequencing is not required.
The A4915 is supplied in a 28-pin TSSOP with an exposed
thermal pad (suffix LP) and a 28-contact 5 Ã 5 mm QFN with
an exposed thermal pad (suffix ET). These packages are lead
(Pd) free, with 100% matte-tin leadframe plating.
Not to scale
Functional Block Diagram
VDD
0.47 μF
A4915
Rdead
HA
HB
HC
CVDD1
VDD
TDEAD
BRAKEn
DIR
ENABLE
Comm
Logic
Control
Logic
VDD
SPEED
FAULT
OSC
Voltage to
Duty
VRESET
Charge Pump
Regulator
Bootstrap
Monitor
High Side
Driver
VREG
Low Side
Driver
VBB
VREG
CREG
CVBB2
CVBB1
VIN
47 V
TVS
VDD
CA
CB
CC
GHA
GHB
GHC
SA
SB
SC
GLA
GLB
GLC
LSS
GND
CBOOTA
RGATE
RGATE
Phase A
R2
R1
R3
HA
HB
HC
To Phase B
To Phase C
One of three phases shown
A4915-DS, Rev. 1
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