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| 型号： | A3908EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER DC LV 500MA 8DFN |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | 500mA |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN/MLP（2x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1282-6 |
A3908
Low Voltage DC Motor Driver
Functional Description
Voltage Regulation The A3908 regulates the voltage
across the motor coil. The voltage across the OUTA
and OUTB terminal is sensed and compared to an
internal threshold voltage. The high-side switch will
be driven in linear mode to keep the applied voltage
maintained at the calculated level, as follows:
V OUT = 4 × V REF ( R 2 / [ R 1 + R 2 ]) ,
where V REF (VBG) is 1.285 V typical.
Then, for forward mode:
V OUT = V OUTA – V OUTB ,
and for reverse mode:
V OUT = V OUTB – V OUTA .
The alternative method is to provide a tightly regu-
lated voltage to the motor supply pin and run the
source and sink drivers as switches. The voltage drop
across these switches will vary linearly with tempera-
ture and current, therefore the voltage across the motor
coil also will vary. The A3908 will eliminate these
sources of error for a system where controlling the
motor voltage is the optimum means of control.
Thermal Shutdown The A3908 will disable the out-
puts if the junction temperature, T J , reaches 165°C.
There is 15°C of hysteresis, so when the junction
temperature drops below 150°C, the device will begin
to operate normally.
Control Logic Table
Dropout Mode The source and sink drivers have a
total R DS(on) of approximately 1.2 Ω total. When the
motor supply voltage, V DD , drops too low compared
to the regulated value, the IC enters dropout mode. In
this case, the voltage across the motor coil will be:
V MOTOR = V DD – I LOAD ( R DS(sink) + R DS(src) )
Brake Mode When both inputs are high, the A3908
goes into high-side brake mode (turns on both source
drivers). There is no protection during braking, so care
must be taken to ensure that the peak current does not
exceed the absolute maximum current, I OUT .
Standby Mode To minimize battery drain, standby
mode will turn off all of the circuitry and draw typi-
cally less than 100 nA from the VDD line. There will
be a very short delay, approximately 2 μ s, before
enabling the output drivers after release of standby
mode.
Power Dissipation . Power can be approximated
based on the below three components:
P D(src) = I LOAD ( V DD – V REG ) ,
P D(sink) = I LOAD × R DS(sink) , and
P bias = V DD × I DD .
IN1
0
0
1
1
Settings
IN2
0
1
0
1
OUTA
Off
Low
V REG
High
OUTB
Off
V REG
Low
High
Resulting Mode
Standby
Reverse
Forward
Brake
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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| A3909GLNTR-T | 功能描述:IC MOTOR DRIVER PAR 10SSOP 制造商:allegro microsystems, llc 系列:- 包装:剪切带（CT） 零件状态:有效 输出配置:半桥（4） 应用:DC 电机，通用，步进电机 接口:逻辑 负载类型:电感 技术:DMOS 导通电阻（典型值）:1.6 欧姆 LS + HS 电流 - 输出/通道:1A 电流 - 峰值输出:- 电压 - 电源:4 V ~ 18 V 电压 - 负载:4 V ~ 18 V 工作温度:-40°C ~ 150°C（TJ） 特性:- 故障保护:限流，超温 安装类型:表面贴装 封装/外壳:10-SOP（0.154"，3.90mm 宽） 供应商器件封装:10-SSOP 标准包装:1 |
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