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PDF A3946 Data sheet ( Hoja de datos )
| Número de pieza | A3946 | |
| Descripción | Half-Bridge Power MOSFET Controller | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A3946
Half-Bridge Power MOSFET Controller
Features and Benefits
▪ On-chip charge pump for 7 V minimum input
supply voltage
▪ High-current gate drive for driving a wide range of
N-channel MOSFETs
▪ Bootstrapped gate drive with top-off charge pump
for 100% duty cycle
▪ Overtemperature protection
▪ Undervoltage protection
▪ –40ºC to 135ºC ambient operation
Packages:
16-pin SOICW (suffix LB)
16-pin TSSOP with exposed
thermal pad (suffix LP)
Description
TheA3946 is designed specifically for applications that require
high power unidirectional DC motors, three-phase brushless DC
motors, or other inductive loads. The A3946 provides two
high-current gate drive outputs that are capable of driving a
wide range of power N-channel MOSFETs. The high-side gate
driver switches an N-channel MOSFET that controls current to
the load, while the low-side gate driver switches an N-channel
MOSFET as a synchronous rectifier.
Abootstrap capacitor provides the above-battery supply voltage
required for N-channel MOSFETs. An internal top-off charge
pump for the high side allows DC (100% duty cycle) operation
of the half-bridge.
The A3946 is available in a choice of two power packages:
a 16-lead SOIC with two internally-fused pins for enhanced
power dissipation (part number suffix LB), and a 16-lead
TSSOP with exposed thermal pad (suffix LP). Both packages
have a lead (Pb) free version, with 100% matte tin plated
leadframes (suffix -T).
Approximate Scale 1:1
Typical Application
VBAT
ECU
VBB
~FAULT
BOOT
GH
IN1
IN2
RESET
A3946
S
GL
CP1
DT
VREF
CP2
VREG
LGND
PGND
M
29319.150h
1 page  
A3946
Half-Bridge Power MOSFET Controller
ELECTRICAL CHARACTERISTICS at TA = –40 to +135°C, VBB = 7 to 60 V (unless otherwise noted)
Characteristics
Protection
VREG Undervoltage
BOOT Undervoltage
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Logic
Input Current
Logic Input Voltage
Logic Input Hysteresis
Fault Output
Symbol
Test Conditions
VREGOFF
VREGON
VBSOFF
VBSON
TJTSD
TJ
VREG decreasing
VREG increasing
VBOOT decreasing
VBOOT increasing
Temperature increasing
Recovery = TJTSD – TJ
IIN(1)
IIN(0)
VIN(1)
VIN(0)
–
Vol
Voh
IN1 VIN / IN2 VIN = 2.0 V
IN1 VIN / IN2 VIN = 0.8 V
RESET pin only
IN1 / IN2 logic high
RESET logic high
Logic low
All digital inputs
I = 1 mA, fault asserted
V=5V
Min.
Limits
Typ. Max. Units
7.8 8.3
8.6 9.1
7.25 7.8
8 8.75
– 170
– 15
8.8
9.6
8.3
9.5
–
–
V
V
V
V
°C
°C
– 40 100 μA
– 16 40 μA
– – 1 μA
2.0 – – V
2.2 – – V
– – 0.8 V
100 – 300 mV
– – 400 mV
– – 1 μA
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A3946
Half-Bridge Power MOSFET Controller
C2
10 μF
P
VBB
C1
0.47 μF
CP2
CP1
P
+VBAT
VREF
VREF
0.1 uF
10
k7 L
~FAULT
VREF DT
DC Motor #1
Forward
Slow
Decay
DC Motor #2
Forward
Slow
Decay
IN1
IN2
External
+5 V
RESET
+5 Vref
Charge
Pump
LP
ILIM
Top-Off
Charge Pump
Protection
VREG Undervoltage
Overtemperature
UVLOBOOT
L
Bootstrap
UVLO
Turn-On
Delay
High Side
Driver
Control
Logic
VREG
L
Low Side
Driver
L
P
L
VREG
BOOT
CREG
P 10 μF
M
M
DC Motor
#1
DC Motor
#2
GH RGATE
IRF2807
33 7
S
470
k7
P
GL
RGATE
IRF2807
PGND
LGND
33 7
470
k7
LP
Diagram C. Independent drivers. Two low-side drives.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet A3946.PDF ] | |
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