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参数资料
| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 32/44页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR MICRO STEP 28TSSOP |
| 特色产品： | A4979 Series |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器，步进电机驱动器 |
| 评估套件： | 可供 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 7 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°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： | 620-1463-6 |
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A4979
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
The total power dissipation for each of the four decay modes,
P D(TOT) XX , is the average power for the drive current ramp por-
tion, P D , and the drive current decay portion, P D(XX) of the PWM
cycle. For slow decay the current will be rising for approximately
20% of the cycle and decaying for approximately 80%. For fast
decay the ratio will be approximately 50%. Note that these are
approximate figures and will vary slightly depending on the
motor characteristics and the use of synchronous rectification.
The following formulas may be used to estimate total power dis-
sipation:
? Synchronous slow decay mode
P D(TOT)SS = 0.2 × P D + 0.8 × P D(SS)
P D(TOT)SS = 0.2 ( I 2 [ R DS(on)H + R DS(on)L ]) + 0.8 ( I 2 × 2 × R DS(on)L )
? Non-synchronous slow decay mode
P D(TOT)NS = 0.2 × P D + 0.8 × P D(NS)
P D(TOT)NS = 0.2 ( I 2 [ R DS(on)H + R DS(on)L ]) + 0.8 ( I 2 × R DS(on)L + I × V F )
5
4
3
2
? Synchronous fast decay mode
P D(TOT)SF = 0.5 × P D + 0.5 × P D(SF)
P D(TOT)SF = I 2 ( R DS(on)H + R DS(on)L )
? Non-synchronous fast decay mode
P D(TOT)NF = 0.5 × P D + 0.5 × P D(NF)
P D(TOT)NF = 0.5( I 2 [R DS(on)H + R DS(on)L ] ) + 0.5( I × [ V FH + V FL ] )
An approximation of the total dissipation can be calculated by
summing the total power dissipated in both bridges and adding
the control circuit power due to V BB × I BB and V DD × I DD .
The total power at the required ambient temperature can then be
compared to the allowable power dissipation shown in figure 15.
For critical applications, where the first order power estimate is
close to the allowable dissipation, the power calculation should
take several other parameters into account including: motor
parameters, dead time, and switching losses in the controller.
R θ JA = 28 °C/W
(on 4-layer PCB)
1
R θ JA = 32 °C/W
(on 2-layer PCB)
0
25
50
75
100
125
150
Ambient Temperature (°C)
Figure 15. Allowable power dissipation, on typical PCBs
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
32
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