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| 型号： | MC33981BPNAR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 30/40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
POWER DISSIPATION
APPLICATION
Engine cooling, air conditioning, and fuel pump are the
targeted automotive applications for the 33981. Conventional
solutions are designed with discrete components that are not
optimized in terms of component board size, protection, and
diagnostics. The 33981 is the right candidate to develop
lighter and more compact units.
The adjustment of the DC motor speed allows optimizing
of energy consumption. It is realized by chopping the supply
voltage, hence the mean voltage, applied to the motor. The
commonly used control technique is pulse wide modulation
(PWM) where the average voltage is proportional to the duty
cycle. Most applications require a PWM frequency of at least
20 kHz to avoid audible noise. Figure 34 illustrates typical
waveforms when switching the 33981 at 20 kHz with a duty
cycle of 80%. The output voltage (OUT) and current in the
motor (I MOTOR ) waveforms are represented.
OUT
The analysis that follows assumes an inductive load and
assumes that the current is constant in the load.
The case being considered in this paper is inductive load
and the hypothesis is that the current is constant in the load.
ON-STATE LOSSES
The mean on-state loss periods in the 33981 can be
calculated as follows:
Pon_state = a · R DS(ON) · I OUT2 where ‘a’ is the duty cycle.
The critical parameter is the on resistance (R DS(ON) ) that
increases with temperature. The 33981 has a maximum
R DS(ON) at 25 oC of 4.0 m ? and its deviation with
7
6
5
4
3
2
1
Imotor (10A/div)
0
-50
0
50
100
150
200
Temperature (°C)
MC33981 OFF
MC33981 ON
Figure 34. Current and Voltage waveforms
POWER DISSIPATION
The 33981 power dissipation is the sum of two kinds of
losses:
? On-State losses when device is fully ON,
Figure 35. R DS(ON) vs. Temperature
SWITCHING LOSSES
The mean switching losses in the 33981 can be calculated
as follows:
Pswitching = (t ON . F REQ . V PWR . I OUT ) / 2 + (t OFF . F REQ . ?
V PWR . I OUT ) / 2
where t ON /t OFF is the turn on/off time.
The switching time is a critical parameter. The 33981
provides adjustable slew rates through an external capacitor
(SR) that slow down the rise and fall times to reduce the
electromagnetic emissions. However, this adjustment will
have an impact on power dissipation. Figure 36 gives the
positive (SR R ) and negative (SR F ) slew rate versus different
? Switching losses when the device switches ON and
OFF.
33981
Analog Integrated Circuit Device Data ?
30
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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