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参数资料
| 型号： | A4980KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/44页 |
| 文件大小： | 0K |
| 描述： | IC STEPPER DVR PROGR 28-TSSOP |
| 标准包装： | 1 |
| 应用： | 步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±1.4A |
| 电压 - 负载： | 0 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 620-1461-6 |
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A4980
Automotive, Programmable Stepper Driver
Reset Time, t EN , to allow the internal charge pump and regulator to
reach their full operating state.
The VBB and VREG undervoltage monitor system is designed to
allow the A4980 to continue operating safely during the extreme
motor supply voltage drop caused by cold cranking with a weak
battery when a reverse battery protection diode is also present.
During low voltage transients the A4980 will continue to step a
motor. However, current control will not achieve the same accu-
racy as specified with a motor supply voltage greater than 7 V. In
fact a low motor supply voltage may not provide sufficient drive
to allow the motor current to reach its normal operating level,
especially if the motor is rotating and a back EMF is present. It is
therefore recommended that when a VBB undervoltage condition
is indicated, the motor is held stationary. This will help ensure
that the motor does not slip and that the system retains some
degree of control over the motor position, thus avoiding the need
to recalibrate the motor position.
The output drive FETs of the A4980 remain protected from short
circuits down to the VREG undervoltage level. However, the
overcurrent thresholds cannot be guaranteed to meet the preci-
sion specified at higher supply voltage. In addition the open load
detection may indicate a fault and the stall detection is not likely
to correctly identify a motor stall condition when VBB is below
the VBB undervoltage level.
Temperature Monitors
Three specific temperature thresholds are provided: a hot
warning, a cold warning, and an overtemperature shutdown. In
addition, the analog internal signal used to determine the chip
temperature can be selected in Configuration Register 1 as the
output on the DIAG pin through the serial interface. The analog
scale is T J ≈ (V DIAG – V TO ) / A T .
Hot Warning If the chip temperature rises above the Hot Tem-
perature Warning Threshold, T JWH , the Fault flag will go low and
the Hot Warning bits will be set in the diagnostic registers. No
action will be taken by the A4980. When the temperature drops
below the Hot Temperature Warning Threshold, the Fault flag
will go high but the Hot Warning bits remain set in the diagnostic
registers until reset.
Cold Warning If the chip temperature falls below the Cold
Temperature Warning Threshold, T JWC , the Fault flag will go low
and the Cold Warning bits will be set in the diagnostic registers.
No action will be taken by the A4980. When the temperature rises
above the Cold Temperature Warning Threshold, the Fault flag
will go high but the Cold Warning bits remain set in the diagnos-
tic registers until reset.
Overtemperature Shutdown If the chip temperature rises
above the Overtemperature Shutdown Threshold, T JF , the Fault
flag will go low and the Thermal Shutdown bits will be set in the
diagnostic registers. The A4980 will disable the outputs to try to
prevent a further increase in the chip temperature. When the tem-
perature drops below the Overtemperature Shutdown Threshold,
the Fault flag will go high but the Thermal Shutdown bits remain
set in the diagnostic register until reset.
Bridge and Output Diagnostics
The A4980 includes monitors that can detect a short to supply or
a short to ground at the motor phase connections. These condi-
tions are detected by monitoring the current from the motor
phase connections through the bridge to the motor supply and to
ground.
Low current comparators and timers are provided to help detect
possible open load conditions.
Short to Supply A short from any of the motor connections to
the motor supply (VBBA or VBBB) is detected by monitoring the
voltage across the low-side current sense resistor in each bridge.
This gives a direct measurement of the current through the low
side of the bridge.
When a low-side FET is in the On state, the voltage across the
sense resistor, under normal operating conditions, should never
be more than the Maximum Sense Voltage, V SMAX . In this state,
an overcurrent is determined to exist when the voltage across the
sense resistor exceeds the Low-Side Overcurrent Sense Voltage,
V OCL , typically 2 × V SMAX . This overcurrent must be continu-
ously present for at least the Overcurrent Fault Delay, t SCT ,
before the short fault is confirmed by setting the relevant bit in
FAULT0 and driving the DIAG output low if the Fault Output
flag is selected. The output is switched off and remains off until a
fault reset occurs.
Note that the sense resistor cannot distinguish which low-side
FET is in an overcurrent state. So, if more than one low-side FET
is active when the fault is detected, for example during low-side
recirculation with synchronous rectification, then the shorted con-
nection is determined from the internal PWM state.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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| A4982 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
| A4982_V4 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
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| A4982SETTR-T | 功能描述:IC STEPPER MOTOR DRIVER 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A4982SLPTR | 制造商:Allegro MicroSystems LLC 功能描述:DMOS Microstepping Driver |
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