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A3972

更新时间： 2024-02-08 12:04:19
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器电机
页数 文件大小 规格书
12页 190K
描述
DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER

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A3972 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：DIP
包装说明：DIP, DIP24,.3针数：24
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.81
其他特性：ALSO REQUIRES 15V TO 50V VBB SUPPLY模拟集成电路 - 其他类型：BRUSH DC MOTOR CONTROLLER
JESD-30 代码：R-PDIP-T24JESD-609代码：e3
长度：30.099 mm功能数量：2
端子数量：24最高工作温度：85 °C
最低工作温度：-20 °C最大输出电流：1.5 A
封装主体材料：PLASTIC/EPOXY封装代码：DIP
封装等效代码：DIP24,.3封装形状：RECTANGULAR
封装形式：IN-LINE峰值回流温度（摄氏度）：NOT SPECIFIED
电源：5 V认证状态：Not Qualified
座面最大高度：5.33 mm子类别：Motion Control Electronics
最大供电电流 (Isup)：12 mA最大供电电压 (Vsup)：5.5 V
最小供电电压 (Vsup)：4.5 V标称供电电压 (Vsup)：5 V
表面贴装：NO技术：MOS
温度等级：OTHER端子面层：Matte Tin (Sn)
端子形式：THROUGH-HOLE端子节距：2.54 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：7.62 mmBase Number Matches：1

A3972 数据手册

 浏览型号A3972的Datasheet PDF文件第3页浏览型号A3972的Datasheet PDF文件第4页浏览型号A3972的Datasheet PDF文件第5页浏览型号A3972的Datasheet PDF文件第7页浏览型号A3972的Datasheet PDF文件第8页浏览型号A3972的Datasheet PDF文件第9页 
3972  
DUAL DMOS FULL-BRIDGE  
MICROSTEPPING PWM MOTOR DRIVER  
FUNCTIONAL DESCRIPTION (continued)  
Word 1 Bit Assignments  
For example, with a master oscillator frequency of 4 MHz, the  
fast-decay time will be adjustable from 1.75 µs to 63.75 µs in  
increments of 2 µs.  
Bit  
Function  
D0  
D1  
D2  
D3  
Word select = 1  
Blank-time LSB  
Blank-time MSB  
Off-time LSB  
D8 – D11 Fast Decay Time. These four bits set the fast-  
decay portion of fixed off-time for the internal PWM control  
circuitry. The fast-decay portion is defined by:  
D4  
Off-time bit 1  
tfd = [(1 + N) x 8/fOSC] - 1/fOSC  
D5  
D6  
Off-time bit 2  
Off-time bit 3  
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. For tfd > toff , the device will effectively  
operate in fast-decay mode.  
D7  
D8  
D9  
Off-time MSB  
Fast-decay time LSB  
Fast-decay time bit 1  
Fast-decay time bit 2  
Fast-decay time MSB  
C0 oscillator control  
C1 oscillator control  
SR control bit 1  
SR control bit 2  
Reserved for testing  
Reserved for testing  
Idle mode  
D10  
D11  
D12  
D13  
D14  
D15  
D16  
D17  
D18  
D12 – D13 Oscillator Control. A 4 MHz internal oscillator  
is used for the timing functions and charge-pump clock. If  
more precise control is required, an external oscillator can be  
input to the OSC terminal. To accommodate a wider range of  
system clocks, an internal divider is provided to generate the  
desired MO frequency according to the following table:  
D13  
D12  
OSC  
0
0
1
1
0
1
0
1
4 MHz internal clock  
External clock  
External clock/2  
External clock/4  
D1 – D2 Blank Time. These two bits set the blank time for  
the current-sense comparator. When a source driver turns on, a  
current spike occurs due to the reverse-recovery currents of the  
clamp diodes and/or switching transients related to distributed  
capacitance in the load. To prevent this current spike from  
erroneously resetting the source-enable latch, the sense com-  
parator is blanked. The blank timer runs after the off-time  
counter to provide the programmable blanking function. The  
blank timer is reset when PHASE is changed.  
D14 – D15 Synchronous Rectification.  
D15  
D14  
Synchronous Rectifier  
0
0
1
1
0
1
0
1
Active  
Disabled  
Passive  
Low side only  
D2  
D1  
Time  
The different modes of operation are in the synchronous  
rectification section of the functional description.  
0
0
1
0
1
0
4/fOSC  
6/fOSC  
8/fOSC  
D16, D17. These bits are reserved for testing and should be  
1
1
12/fOSC  
programmed to zero during normal operation.  
D18 Idle Mode. The device can be placed in a low power  
“idle” mode by writing a “0” to D18. The outputs will be  
disabled, the charge pump will be turned off, and the device  
will draw a lower load supply currrent. The undervoltage  
monitor circuit will remain active. D18 should be programmed  
high for 1 ms before attempting to enable any output driver.  
D3 – D7 Fixed Off Time. These five bits set the fixed off-  
time for the internal PWM control circuitry. Fixed off-time is  
defined by:  
toff = [(1 + N) x 8/fOSC] - 1/fOSC  
where N = 0….31  
continued next page ...  
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
6
1...3456789...12

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