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| 型号： | A1448EEWLT-P |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DVR BLDC FULLBRDG MLP |
| 产品变化通告： | Pre-EOL Notice 07/Feb/2012 |
| 标准包装： | 1 |
| 应用： | DC 电机驱动器，无刷（BLDC） |
| 输出数： | 1 |
| 电流 - 输出： | ±200mA |
| 电源电压： | 1.8 V ~ 4.2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-XFDFN 裸露焊盘 |
| 供应商设备封装： | 6-MLP/DFN 裸露焊盘（1.5x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1274-6 |
Low-Voltage, Full-Bridge Brushless DC Motor Driver with
A1448
Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching,
and Reverse Battery and Short Circuit Protection
Power Derating
The device must be operated below the maximum junction tem-
perature of the device, T J (max). Under certain combinations of
peak conditions, reliable operation may require derating supplied
power or improving the heat dissipation properties of the appli-
cation. This section presents a procedure for correlating factors
affecting operating T J . (Thermal data is also available on the
Allegro MicroSystems website.)
The package thermal resistance, R θ JA , is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the effective thermal conductivity, K, of
the printed circuit board, including adjacent devices and traces.
Radiation from the die through the device case, R θ JC , is relatively
small component of R θ JA . Ambient air temperature, T A , and air
motion are significant external factors, damped by overmolding.
The effect of varying power levels (Power Dissipation, P D ), can
be estimated. The following formulas represent the fundamental
relationships used to estimate T J , at various P D levels.
For a load of 30 Ω , and given common conditions such as:
T A = 25°C, V DD = 3 V, I DD = 83 mA, V LOAD = 2.43 V,
I LOAD = 81 mA, and R θ JA = 125 °C/W, (see figure 5)
then:
P D = V DD × I DD – V LOAD × I LOAD
= 3 V × 83 mA – 2.43 V × 81 mA
= 52.17 mW
Δ T = P D × R θ JA
= 52.17 mW × 125 °C/W
= 7°C
T J = T A + Δ T
= 25°C + 7°C
P D = V IN × I IN
Δ T = P D × R θ JA
T J = T A + Δ T
V BATT
(1)
(2)
(3)
= 32°C
A worst-case estimate, P D (max), represents the maximum allow-
able power level, without exceeding T J (max), at a selected R θ JA
and T A .
VDD
A1448
VOUT2
M
C BYP
Figure 5. A1448 typical application
CONTROL
NC
VOUT1
GND
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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