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3948 Datasheet

  • 3948

  • DMOS FULL-BRIDGE PWM MOTOR DRIVER

  • 12頁

  • ALLEGRO   ALLEGRO

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3948
A3948SLB
(SOIC)
CP
CP
2
CP
1
PHASE
OSC
GROUND
GROUND
LOGIC SUPPLY
ENABLE
DATA
CLOCK
STROBE
DMOS FULL-BRIDGE PWM
MOTOR DRIVER
1
2
3
4
5
胃
24
23
NC
22
21
V
BB
20
19
18
V
DD
17
16
V
REG
RANGE
NO
CONNECTION
OUT
B
LOAD SUPPLY
GROUND
GROUND
SENSE
OUT
A
NO
CONNECTION
MODE
REF
Designed for pulse-width modulated (PWM) current control of dc
motors, the A3948SB and A3948SLB are capable of continuous output
currents to
鹵1.5
A and operating voltages to 50 V. Internal fixed off-
time PWM current-control timing circuitry can be programmed via a
serial interface to operate in slow, fast, and mixed current-decay
modes. Similar devices with outputs rated to
鹵2
A are available as the
A3958SB/SLB.
PHASE and ENABLE input terminals are provided for use in
controlling the speed and direction of a dc motor with externally
applied PWM-control signals. The ENABLE input can be
programmed via the serial port to PWM the bridge in fast or slow
current decay. Internal synchronous rectification control circuitry is
provided to reduce 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 A3948SB/SLB is supplied in a choice of two power
packages, a 24-pin plastic DIP with a copper batwing tab (package
suffix 鈥楤鈥?, and a 24-lead plastic SOIC with a copper batwing tab
(package suffix 鈥楲B鈥?. In both cases, the power tab is at ground
potential and needs no electrical isolation.
Data Sheet
29319.36A
6
7
8
9
9
LOGIC
CHARGE PUMP
SERIAL PORT
10
11
12
NC
15
14
梅
13
Dwg. PP-069A
Note that the A3948SLB(SOIC) and A3948SB
(DIP) do not share a common terminal
assignment.
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, V
BB
..................
50 V
Output Current, I
OUT
........................
鹵
1.5 A
Logic Supply Voltage, V
DD
................
7.0 V
Input Voltage, V
IN
....
-0.3 V to V
DD
+ 0.3 V
Sense Voltage, V
S
..........................
0.55 V
Reference Voltage, V
REF
..................
5.5 V
Package Power Dissipation (T
A
= 25擄C), P
D
A3948SB .................................
3.1 W*
A3948SLB ...............................
1.6 W*
Operating Temperature Range,
T
A
...............................
-20
擄
C to +85
擄
C
Junction Temperature,
T
J
............................................
+150
擄
C
Storage Temperature Range,
T
S
.............................
-55
擄
C to +150
擄
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擄C.
* Per SEMI G42-88 Specification.
FEATURES
s
s
s
s
s
s
s
鹵1.5
A, 50 V Continuous Output Rating
Low
r
DS(on)
Outputs
Programmable Mixed, Fast, and Slow Current-Decay Modes
Serial Interface Controls Chip Functions
Synchronous Rectification for Low Power Dissipation
Internal UVLO and Thermal-Shutdown Circuitry
Crossover-Current Protection
Always order by complete part number:
Part Number
A3948SB
A3948SLB
Package
24-pin batwing DIP
24-lead batwing SOIC
R
胃
JA
40擄C/W
77擄C/W
R
胃
JT
6擄C/W
6擄C/W

3948 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 1 : ￥16.71000散裝

  • -

  • 散裝

  • 在售

  • 腳輪，滾珠式

  • 0.618"（15.70mm）直徑

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