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| 型号： | MIC4451ZT |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER MOSFET 12A HS TO220-5 |
| 标准包装： | 50 |
| 配置： | 低端 |
| 输入类型： | 反相 |
| 延迟时间： | 15ns |
| 电流 - 峰： | 12A |
| 配置数： | 1 |
| 输出数： | 1 |
| 电源电压： | 4.5 V ~ 18 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 |
| 供应商设备封装： | TO-220-5 |
| 包装： | 管件 |
| 产品目录页面： | 1110 (CN2011-ZH PDF) |
| 其它名称： | 576-1529-5 MIC4451ZT-ND |
Micrel Inc.
Inductive Load Power Dissipation
For inductive loads the situation is more complicated.
For the part of the cycle in which the driver is actively
forcing current into the inductor, the situation is the same
as it is in the resistive case:
P L1 = I 2 R O D
However, in this instance the R O required may be either
the on resistance of the driver when its output is in the
high state, or its on resistance when the driver is in the
low state, depending on how the inductor is connected,
and this is still only half the story. For the part of the
cycle when the inductor is forcing current through the
driver, dissipation is best described as:
P L2 = I V D (1 – D)
where V D is the forward drop of the clamp diode in the
driver (generally around 0.7V). The two parts of the load
dissipation must be summed in to produce P L :
P L = P L1 + P L2
Quiescent Power Dissipation
Quiescent power dissipation (P Q , as described in the
input section) depends on whether the input is high or
low. A low input will result in a maximum current drain
MIC4451/4452
where (A × s) is a time-current factor derived from the
typical characteristic curve “Crossover Energy vs.
Supply Voltage.” Total power (P D ) then, as previously
described is:
P D = P L + P Q + P T
Definitions
C L = Load Capacitance in Farads.
D = Duty Cycle expressed as the fraction of time the
input to the driver is high.
f = Operating Frequency of the driver in Hertz
I H = Power supply current drawn by a driver when both
inputs are high and neither output is loaded.
I L = Power supply current drawn by a driver when both
inputs are low and neither output is loaded.
I D = Output current from a driver in Amps.
P D = Total power dissipated in a driver in Watts.
P L = Power dissipated in the driver due to the driver’s
load in Watts.
P Q = Power dissipated in a quiescent driver in Watts.
P T = Power dissipated in a driver when the output
changes states (“shoot-through current”) in watts.
R O = Output resistance of a driver in Ω s.
V S = Power supply voltage to the IC in volts.
(per driver) of ≤
0.2mA; a logic high will result in a
current drain of ≤ 3.0mA. Quiescent power can therefore
be found from:
P Q = V S [D I H + (1 – D) I L ]
where:
I H = quiescent current with input high
I L = quiescent current with input low
D = fraction of time input is high (duty cycle)
V S = power supply voltage
Transition Power Dissipation
Transition power is dissipated in the driver each time its
output changes state, because during the transition, for
a very brief interval, both the N- and P-channel
MOSFETs in the output totem-pole are ON
simultaneously, and a current is conducted through them
from V S to ground. The transition power dissipation is
approximately:
P T = 2 f V S (A × s)
October 2011
10
M9999-103111-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4451ZT L2 | 制造商:Micrel 功能描述:The Micrel MIC4451ZT L2 is a 12A Low-Side MOSFET Driver. |
| MIC4451ZT L3 | 制造商:Micrel Inc 功能描述:Micrel MIC4451ZT L3 MOSFET Drivers |
| MIC4451ZT | 制造商:Micrel Inc 功能描述:MOSFET Driver IC 制造商:Micrel Inc 功能描述:IC, MOSFET DRIVER, LOW SIDE, TO-220 |
| MIC4452 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:12A-Peak Low-Side MOSFET Driver |
| MIC4452ABM | 功能描述:IC DRIVER MOSFET 12A HS 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:50 系列:- 配置:高端 输入类型:非反相 延迟时间:200ns 电流 - 峰:250mA 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:600V 电源电压:12 V ~ 20 V 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-DIP 包装:管件 其它名称:*IR2127 |
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