参数资料
型号: MC33981BPNAR2
厂商: Freescale Semiconductor
文件页数: 31/40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
RECIRCULATION PHASE
120
100
80
60
40
20
0
4.5
6
9
14
27
0
1
2.2
3.3
4.7
6.8
In standard configuration, the motor current recirculation is
handled by an external freewheeling diode. With the 33981,
the freewheeling diode can be replaced by an external low-
side discrete MOSFET.
The power dissipation during the recirculation phase is
calculated as follows for the diode and the low-side MOSFET
respectively:
Pdiode = (1-a) . V F . I OUT
where ‘a’ is the duty cycle
Vbat
Pmosfet_ls = (1-a) . R DS(ON)_ls . I OUT2
where R DS(ON)_ls is the on resistance of the low side.
90
80
70
60
50
40
30
20
10
0
0
1
2.2
3.3
4.7
6.8
APPLICATIONS EXAMPLES
EXCEL TOOL
An excel tool has been created with all the above formulas
to calculate the dissipated power and the junction
temperature knowing the application conditions. An example
of the interface is given in Figure 38 . The parameters to enter
4.5
6
9
14
27
concern the load, the high side device, the recirculation, and
Vbat
Figure 36. Positive and Negative Slew Rate
vs. SR Capacitor
the board. They are V PWR , DC current in the load (Imax for
100% of duty cycle), PWM frequency, 33981 R DS(ON) at
150 oC, SR capacitor, low side R DS(ON) at 150 oC, ambient
temperature, and thermal impedance.
INPUTS
Vpwr
12 V
Load
High Side
Device (HS)
Imax
Frequency
R DSON
@150°C
SR
Capacitor
20 A
20 KHz
6.8 mOhm
0 nF
Low Side Characteristics
Recirculation
R DSON
@150°C
20 mOhm
Figure 37. OUT switching vs. SR Capacitor
JUNCTION TEMPERATURE
The junction temperature of the 33981 can be calculated
Board
Rthja
T ambiant
15°C/W
85°C
knowing the power dissipation and the thermal
characteristics of the PC board with this formula:
T J = T A + (Pon_state + Pswitching). R THJA
where T J is the junction temperature, T A the ambient
temperature, and R THJA the thermal impedance junction to
ambient.
Figure 38. Excel Tool
The calculations are done with the maximum R DS(ON) for
the 33981 and the low side. The current is also considered
constant in the load. The model taken for the V F of the diode
is (0.4 + 0.01 . I OUT ) Volts.
The listed conditions in Figure 38 are the ones chosen for
the entire document.
33981
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
31
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