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PDF ( 数据手册 , 数据表 ) 3946

零件编号 3946
描述 Half-bridge Power MOSFET Controller
制造商 Allegro Micro Systems
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3946 数据手册, 描述, 功能
3946
Half-Bridge Power MOSFET Controller
A3946KLB SOIC
Scale 1:1
VREG
CP2
CP1
PGND
GL
S
GH
BOOT
1
2
3
4
5
6
7
8
16 VBB
15 VREF
14 DT
13 LGND
12 RESET
11 IN2
10 IN1
9 ~FAULT
A3946KLP TSSOP with Exposed Thermal Pad
Scale 1:1
VREG
CP2
CP1
PGND
GL
S
GH
BOOT
1
2
3
4
5
6
7
8
16 VBB
15 VREF
14 DT
13 LGND
12 RESET
11 IN2
10 IN1
9 ~FAULT
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, VBB ............................. 60 V
Logic Inputs ..................................–0.3 V to 6.5 V
Pin S……. .........................................–4 V to 60 V
Pin GH ...........................................–4 V to 75 V
Pin BOOT….. ................................–0.6 V to 75 V
Pin DT ........................................................ VREF
Pin VREG ......................................–0.6 V to 15 V
Package Thermal Resistance, RJA
A3946KLB..................................... 48°C/W1
A3946KLB..................................... 38°C/W2
A3946KLP ..................................... 44°C/W1
A3946KLP ..................................... 34°C/W2
Operating Temperature Range, TA.. –40°C to +135°C
Junction Temperature, TJ...........................+150°C
Storage Temperature Range, TS....-55°C to +150°C
Notes:
1. Measured on a two-sided PCB with 3 in.2 of
2 oz. copper.
2. Measured on JEDEC standard High-K board.
The A3946 is designed specically 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 rectier.
A bootstrap capacitor provides the above-battery supply voltage
required for N-channel MOSFETs. An internal charge pump for the
high side allows for 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 copper batwing power tab (part number sufx LB),
and a 16-lead TSSOP with exposed thermal pad (sufx LP).
www.DataSheet4U.com
FEATURES
„ 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 charge pump for 100% duty cycle
„ Overtemperature protection
„ Undervoltage protection
„ –40ºC to 135ºC ambient operation
Always order by complete part number:
Part Number
A3946KLB
A3946KLP
Package
16-Lead SOIC; Copper Batwing Power Tab
16-Lead TSSOP; Exposed Thermal Pad







3946 pdf, 数据表
3946
Half-Bridge Power MOSFET Controller
Application Block Diagrams
C2
10 µF
P
C1
0.47 µF
CP2
CP1
+VBAT
VREF
VREF
0.1 uF
10
kL
~FAULT
IN
Brake
DT
RDEAD
15.8 k
L
IN1
Forward
IN
IN2
External
+5 V
RESET
+5 Vref
Charge
Pump
LP
Protection
VREG Undervoltage
Overtemperature
UVLOBOOT
L
Turn-On
Delay
Charge
Pump
Bootstrap
UVLO
ILIM
High Side
Driver
Control
Logic
VREG
L
Low Side
Driver
L
P
L
VREG
BOOT
CREG
10 µF
P
CBOOT
0.47 µF
GH RGATE
33
S
IRF2807
200
k
IRF2807
GL RGATE
33
PGND
LGND
LP
P
M
DC
Motor
Diagram A. Dependent drivers. Unidirectional motor control with braking and dead time. TDEAD = 1 µs; QTOTAL = 160 nC.
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8














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