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What is A3958SLB?

This electronic component, produced by the manufacturer "Allegro MicroSystems", performs the same function as "DMOS FULL-BRIDGE PWM MOTOR DRIVER".


A3958SLB Datasheet PDF - Allegro MicroSystems

Part Number A3958SLB
Description DMOS FULL-BRIDGE PWM MOTOR DRIVER
Manufacturers Allegro MicroSystems 
Logo Allegro MicroSystems Logo 


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3958
A3958SLB
CP 1
CP2 2
CP1 3
θ
PHASE 4
OSC 5
GROUND 6
GROUND 7
LOGIC SUPPLY 8 VCC
ENABLE 99
DATA 10
CLOCK 11
STROBE 12
24 VREG
23 RANGE
NC 22 NO
CONNECTION
21 OUTB
VBB 20 LOAD SUPPLY
19 GROUND
18 GROUND
17 SENSE
16 OUTA
NC 15
NO
CONNECTION
14 MODE
÷ 13 REF
Dwg. PP-069
Note that the A3958SLB(SOIC) and A3958SB
(DIP) do not share a common terminal
assignment.
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, VBB .................. 50 V
Output Current, IOUT ........................ ±2.0 A
Logic Supply Voltage, VDD ................ 7.0 V
Input Voltage, VIN .... -0.3 V to VDD + 0.3 V
Sense Voltage, VS ............................ 0.5 V
Reference Voltage, VREF .................. 2.7 V
Package Power Dissipation (TA = 25°C), PD
A3958SB ................................. 3.1 W*
A3958SLB ............................... 2.2 W*
Operating Temperature Range,
TA ............................... -20°C to +85°C
Junction Temperature,
TJ ............................................ +150°C
Storage Temperature Range,
TS ............................. -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.
* Per SEMI G42-88 Specification.
DMOS FULL-BRIDGE PWM
MOTOR DRIVER
Designed for pulse-width modulated (PWM) current control of dc
motors, the A3958SB and A3958SLB are capable of continuous output
currents to ±2 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.
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 A3958SB/SLB is supplied in a choice of two power
packages, a 24-pin plastic DIP with a copper batwing tab (package
suffix ‘B’), and a 24-lead plastic SOIC with a copper batwing tab
(package suffix ‘LB’). In both cases, the power tab is at ground
potential and needs no electrical isolation.
FEATURES
I ±2 A, 50 V Continuous Output Rating
I Low rDS(on) Outputs (270 m, Typical)
I Programmable Mixed, Fast, and Slow Current-Decay Modes
I Serial Interface Controls Chip Functions
I Synchronous Rectification for Low Power Dissipation
I Internal UVLO and Thermal-Shutdown Circuitry
I Crossover-Current Protection
Always order by complete part number:
Part Number
Package
A3958SB
24-pin batwing DIP
A3958SLB
24-lead batwing SOIC
RθJA
40°C/W
56°C/W
RθJT
6°C/W
6°C/W

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A3958SLB equivalent
3958
DMOS FULL-BRIDGE
PWM MOTOR DRIVER
FUNCTIONAL DESCRIPTION
Serial Interface. The A3958 is controlled via a 3-wire
(clock, data, strobe) serial port. The programmable
functions allow maximum flexibility in configuring the
PWM to the motor drive requirements. The serial data is
clocked in starting with D19.
Bit Function
D0 Blank Time LSB
D1 Blank Time MSB
D2 Off Time LSB
D3 Off Time Bit 1
D4 Off Time Bit 2
D5 Off Time Bit 3
D6 Off Time MSB
D7 Fast Decay Time LSB
D8 Fast Decay Time Bit 1
D9 Fast Decay Time Bit 2
D10 Fast Decay Time MSB
D11 Sync. Rect. Mode
D12 Sync. Rect. Enable
D13 External PWM Mode
D14 Enable
D15 Phase
D16 Reference Range Select
D17 Internal PWM Mode
D18 Test Use Only
D19 Sleep Mode
D0 – D1 Blank Time. The current-sense comparator is
blanked when any output driver is switched on, according
to the table below. fosc is the oscillator input frequency.
D1 D0 Blank Time
00
01
10
11
4/fosc
6/fosc
12/fosc
24/fosc
D2 – D6 Fixed-Off Time. A five-bit word sets the
fixed-off time for internal PWM current control. The off
time is defined by
toff = (8[1 + N]/fosc) - 1/fosc
where N = 0 … 31
For example, with an oscillator frequency of 4 MHz, the
off time will be adjustable from 1.75 µs to 63.75 µs in
increments of 2 µs.
D7 – D10 Fast Decay Time. A four-bit word sets the
fast-decay portion of the fixed-off time for the internal
PWM control circuitry. This will only have impact if the
mixed-decay mode is selected (via bit D17 and the MODE
input terminal). For tfd > toff, the device will effectively
operate in the fast-decay mode. The fast decay portion is
defined by
tfd = (8[1 + N]/fosc) - 1/fosc
where N = 0 … 15
For example, with an oscillator frequency of 4 MHz, the
fast decay time will be adjustable from 1.75 µs to
31.75 µs in increments of 2 µs.
D11 Synchronous Rectification Mode. The active
mode prevents reversal of load current by turning off
synchronous rectification when a zero current level is
detected. The passive mode will allow reversal of current
but will turn off the synchronous rectifier circuit if the
load current inversion ramps up to the current limit set by
VREF/RS.
D11 Mode
0 Active
1 Passive
D12 Synchronous Rectification Enable.
D12 Synchronous Rect.
0 Disabled
1 Enabled
D13 External PWM Decay Mode. Bit D13 determines
the current-decay mode when using ENABLE chopping
for external PWM current control.
D13 Mode
0 Fast
1 Slow
D14 Enable Logic. Bit D14, in conjunction with
ENABLE, determines if the output drivers are in the
chopped (OFF)(ENABLE = D14) or ON (ENABLE
D14) state.
ENABLE D14 Mode
0 0 Chopped
1 0 On
0 1 On
1 1 Chopped
www.allegromicro.com
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Featured Datasheets

Part NumberDescriptionMFRS
A3958SLBThe function is DMOS FULL-BRIDGE PWM MOTOR DRIVER. Allegro MicroSystemsAllegro MicroSystems

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