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参数资料
| 型号： | MIC4421ABM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER MOSFET 9A LS 8-SOIC |
| 标准包装： | 2,500 |
| 配置： | 低端 |
| 输入类型： | 反相 |
| 延迟时间： | 15ns |
| 电流 - 峰： | 9A |
| 配置数： | 1 |
| 输出数： | 1 |
| 电源电压： | 4.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC4421ABMTR MIC4421ABMTR-ND |
Micrel, Inc.
Application Information
Supply Bypassing
Charging and discharging large capacitive loads quickly
requires large currents. For example, charging a
10,000pF load to 18V in 50ns requires 3.6A.
The MIC4421A/4422A has double bonding on the supply
pins, the ground pins and output pins. This reduces
parasitic lead inductance. Low inductance enables large
currents to be switched rapidly. It also reduces internal
ringing that can cause voltage breakdown when the
driver is operated at or near the maximum rated voltage.
Internal ringing can also cause output oscillation due to
feedback. This feedback is added to the input signal
since it is referenced to the same ground.
MIC4421A/4422A
To guarantee low supply impedance over a wide
frequency range, a parallel capacitor combination is
recommended for supply bypassing. Low inductance
ceramic disk capacitor swith short lead lengths (< 0.5
inch) should be used. A 1μF low ESR film capacitor in
parallel with two 0.1μF low ESR ceramic capacitors,
(such as AVX RAM Guard ? ), provides adequate
bypassing. Connect one ceramic capacitor directly
between pins 1 and 4. Connect the second ceramic
capacitor directly between pins 8 and 5.
Grounding
The high current capability of the MIC4421A/4422A
demands careful PC board layout for best performance.
Since the MIC4421A is an inverting driver, any ground
lead impedance will appear as negative feedback which
V S
MIC4421A
1μF
?2
V S
can degrade switching speed. Feedback is especially
noticeable with slow-rise time inputs. The MIC4421A
input structure includes about 600mV of hysteresis to
ensure clean transitions and freedom from oscillation,
but attention to layout is still recommended.
Figure 7 shows the feedback effect in detail. As the
MIC4421A input begins to go positive, the output goes
?1 Drive Signal
Conduction Angle
Control 0°C to 180°C
Conduction Angle
Control 180°C to 360°C
Drive
Logic
V S
?1
1μF
?3
V S
negative and several amperes of current flow in the
ground lead. As little as 0.05 ? of PC trace resistance
can produce hundreds of millivolts at the MIC4421A
ground pins. If the driving logic is referenced to power
ground, the effective logic input level is reduced and
oscillation may result.
MIC4422A
Phase 1 of 3 Phase Motor
Driver Using MIC4421A/22A
Figure 5. Direct Motor Drive
To insure optimum performance, separate ground traces
should be provided for the logic and power connections.
Connecting the logic ground directly to the MIC4421A
GND pins will ensure full logic drive to the input and
ensure fast output switching. Both of the MIC4421A
GND pins should, however, still be connected to power
ground.
V IN +15V
1N4448
(x2)
30
29
Output Voltage
vs. Load Current
0.1μF
50V
1μF
WIMA
MKS2
BYV 10
(x2)
28
27
MIC4422A
0.1μF
WIMA
MKS2
United Chemcon SXE
500μF
50V
100μF
50V
26
25
0
50 100 150 200 250 300 350
mA
Figure 6. Self Contained Voltage Doubler
June 2007
8
M9999-062707
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| MIC4421ABN | 功能描述:IC DRIVER MOSFET 9A LS 8-DIP 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 |
| MIC4421ACM | 功能描述:IC DRIVER MOSFET 9A LS 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 |
| MIC4421ACM TR | 功能描述:IC DRIVER MOSFET 9A LS 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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