参数资料
型号: MC33981BPNAR2
厂商: Freescale Semiconductor
文件页数: 32/40页
文件大小: 0K
描述: IC SWITCH HI SIDE SINGLE 16-PQFN
标准包装: 1,200
类型: 高端
输入类型: PWM
输出数: 1
导通状态电阻: 4 毫欧
电源电压: 6 V ~ 27 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-PowerDFN
供应商设备封装: 16-PQFN(12x12)
包装: 带卷 (TR)
TYPICAL APPLICATIONS
POWER DISSIPATION
DC MOTOR 200W
A concrete example is the 33981. A 200 W DC motor, a
frequency of 20 kHz, and an ambient temperature of 85 oC
are chosen. The 33981 is evaluated using the following
board. The thermal impedance of the board is in the range of ?
15 oC/W.
INFLUENCE OF SR CAPACITOR
The SR capacitor value has an impact on these switching
losses. Figure 41 illustrates the percentage of the switching
losses versus the total power dissipation for the same load
conditions as Figure 38 . The higher the SR capacitor value,
the higher the switching losses. They can be more than 50%
of the total power dissipation in the 33981 with a 4.7 nF
capacitor and is a basic applications trade-off. A compromise
should be found between the power dissipation and the
electromagnetic capability (EMC) performance.
6
P switch in g
Pon
5
4
3
2
1
Figure 39. 33981 Evaluation Board
0
0
2 .2
3 .3
4 .7
C s r (n F )
POWER DISSIPATION
Figure 40 illustrates the power dissipation in the 33981.
The conditions are listed in Figure 38 . Maximum power
dissipation of 3.1 W is obtained with a duty of 95%.
Figure 41. Power Switching vs. SR Capacitor
RECIRCULATION PHASE
Figure 42 illustrates the power dissipation for the two
recirculation approaches, diode or low side MOSFET. The
power dissipation gain for the entire system when using the
3.5
3.0
2.5
2.0
MC33981 Power Dissipation
Pon_state
P switching
Ptotal
low side instead of the diode can reach up to 1.5 W with a
duty cycle of 50%.
Total Board Power Dissipation
4.5
4.0
3.5
3.0
Power HS
1.5
1.0
0.5
2.5
2.0
1.5
1.0
0.5
Power Diode
Power Total Board with Diode
Power LS
Power Total Board with LS
0
0.0
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40 50 60
Duty Cycle (%)
70
80
90
100
Ratio PWM %
Figure 40. Power Dissipation (Pon and Pswitching) vs.
Figure 42. Total Board Power Dissipation
Duty Cycle
33981
Analog Integrated Circuit Device Data ?
32
Freescale Semiconductor
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