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| 型号： | A3972SB |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER PWM DUAL 24-DIP |
| 标准包装： | 15 |
| 应用： | 步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±1.5A |
| 电压 - 负载： | 15 V ~ 50 V |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 24-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 24-DIP |
| 包装： | 管件 |
A3972
Word 1 Bit Assignments
Dual DMOS Full-Bridge
Microstepping PWM Motor Driver
FUNCTIONAL DESCRIPTION (continued)
For example, with a master oscillator frequency of 4 MHz, the
Bit
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
Function
Word select = 1
Blank-time LSB
Blank-time MSB
Off-time LSB
Off-time bit 1
Off-time bit 2
Off-time bit 3
Off-time MSB
Fast-decay time LSB
Fast-decay time bit 1
Fast-decay time bit 2
? xed off-time will be adjustable from 1.75 μ s to 63.75 μ s in
increments of 2 μ s.
D8 – D11 Fast Decay Time. These four bits set the fast-
decay portion of ? xed off-time for the internal PWM control
circuitry. The fast-decay portion is de ? ned by:
t fd = [(1 + N) x 8/f OSC ] - 1/f OSC
where N = 0….15
For example, with an oscillator frequency of 4 MHz, the fast-
decay time will be adjustable from 1.75 μ s to 31.75 μ s in incre-
ments of 2 μ s. For t fd > t off , the device will effectively operate
in fast-decay mode.
D11 Fast-decay time MSB
D12 C0 oscillator control
D13 C1 oscillator control
D14 SR control bit 1
D15 SR control bit 2
D16 Reserved for testing
D17 Reserved for testing
D18 Idle mode
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 er-
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 4 MHz internal clock
0 1 External clock
1 0 External clock/2
1 1 External clock/4
D14 – D15 Synchronous Recti ? cation.
roneously resetting the source-enable latch, the sense comparator
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.
D15
0
0
1
D14
0
1
0
Synchronous Recti ? er
Active
Disabled
Passive
D2
D1
Time
1
1
Low side only
0
0
1
1
0
1
0
1
4/ f OSC
6/ f OSC
8/ f OSC
12/ f OSC
The different modes of operation are in the synchronous recti ? -
cation section of the functional description.
D16, D17. These bits are reserved for testing and should be
programmed to zero during normal operation.
D3 – D7 Fixed Off Time. These ? ve bits set the ? xed off-time
for the internal PWM control circuitry. Fixed off-time is de ? ned
by:
t off = [(1 + N) x 8/f OSC ] - 1/f OSC
where N = 0….31
D18 Idle Mode. The device can be placed in a low power
“idle” mode by writing a “0” to D18. The outputs will be dis-
abled, 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.
continued next page ...
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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| A3972SB-T | 功能描述:IC MOTOR DRIVER PWM DUAL 24-DIP 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 |
| A3973KB | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DUAL FULL BRIDGE PROTECTED MOTOR DRIVER |
| A3973SB | 功能描述:IC MOTOR DRIVER PWM DUAL 24-DIP RoHS:否 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 |
| A3973SB-T | 功能描述:IC MOTOR DRIVER PWM DUAL 24-DIP 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 |
| A3973SLB | 功能描述:IC MOTOR DRIVER PWM DUAL 24SOIC RoHS:否 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 |
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