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| 型号： | MC33981BPNAR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 28/40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) |
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TYPICAL APPLICATIONS
EMC AND EMI RECOMMENDATIONS
EFFECTS OF SOME PARAMETERS
The conducted emissions level rise with the duty cycle.
When the duty increases the di/dt on the VPWR line is higher.
RC Out
Filter C2
RC In
Filter
PI
Filter
The device has to deliver more current and provide more
energy. Figure 27 describes the effect of duty cycle increase
on the V PWR current waveform. The conducted emission
level rises with the output frequency. This is due to the
increasing number of commutations.
C3
I(t) on V BAT
Duty Cycle
Increase
C1
t
SR
Figure 27. VPWR Current
HOW TO REDUCE ELECTROMAGNETIC EMISSION
By adjusting the slew rate of the device during turn ON and
turn OFF with SR capacitor, the electromagnetic emissions
can be reduced.
Conductive emission tests were performed (taking care of
the board filtering and routing that have a big impact on EMC
performances).
An optimized solution was found by adding the following
external components to the initial board:
? PI filter on the V PWR : 2 x 3 ? F and 3.5 ? H
? RC IN filter between V PWR and GND: a 2.0 ? resistor in
series with a 100 nF capacitor
? RC Out filter between OUT and GND: a 4.7 ? resistor
in series with a 100 nF capacitor
? Capacitor C1 of 10 nF between V PWR and GND
? Capacitor C2 of 10 nF between OUT and GND
? Capacitor C3 of 10 nF between OUT and V PWR
? Capacitor SR of 3.3 nF
C3 = 10 nF
Figure 29. Enhanced Board
The chart in Figure 30 shows the spectrum of the
enhanced board and the initial board. The improvement is
appreciatively 15 dB to 20 dB in the all frequency range. The
enhanced board is now in accordance with the Class 3 limits
of the CISPR25 standard for conducted emission.
V BAT
PI filter
3.5 μ H
3000 μ F
RC In Filter
33981
SR
3.3 nF
OUT
GND
RC Out Filter
Figure 30. Conducted Emission Spectrum for 33981
RADIATED MEASUREMENTS
This test was performed in order to evaluate the
characteristic of the device relating to radiated emission.
Measurements have been done in accordance with the
CISPR 25 standard as shown in Figure 31 . The tested board
Figure 28. 33981 with Filter
was the EMC enhanced board.
The EMC enhanced board with adapted value filter is
33981
Analog Integrated Circuit Device Data ?
28
Freescale Semiconductor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC33982BPNA | 功能描述:电源开关 IC - 配电 SPSS RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MC33982BPNAR2 | 功能描述:电源开关 IC - 配电 SPSS RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MC33982CHFK | 功能描述:电源开关 IC - 配电 SNGL 2MOHMS RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MC33982CHFKR2 | 功能描述:电源开关 IC - 配电 SNGL 2MOHMS RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MC33982CPNA | 制造商:Freescale Semiconductor 功能描述: |
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