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參數(shù)資料
| 型號(hào)： | MIC4421CT |
| 廠商： | MICREL INC |
| 元件分類(lèi)： | 功率晶體管 |
| 英文描述： | 9A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process |
| 中文描述： | 9 A BUF OR INV BASED MOSFET DRIVER, PSFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 110K |
| 代理商： | MIC4421CT |
MIC4421/4422
Applications Information
Micrel
5-48
April 1998
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 MIC4421/4422 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.
Figure 3. Direct Motor Drive
Figure 4. Self Contained Voltage Doubler
30
29
28
27
26
25
0
50
100
150
200
250
300
350
mA
V
12
LINE
OUTPUT VOLTAGE vs LOAD CURRENT
DRIVE
1DRIVE SIGNAL
CONDUCTION ANGLE
°
TO 180
°
CCONDUCTION ANGLE
°
TO 360
°
MIC4451
VS
1μF
VS
MIC4452
VS
1μF
VS
1
M
3
2
PHASE 1 of 3 PHASE MOTOR
MIC4421
1μF
50V
MKS 2
UNITED CHEMCON SXE
0.1μF
WIMA
MKS 2
1
8
6, 7
5
4
0.1μF
50V
5.6 k
560
+15
560μF 50V
BYV 10 (x 2)
100μF 50V
(x2) 1N4448
2
+
+
+
To guarantee low supply impedance over a wide frequency
range, a parallel capacitor combination is recommended for
supply bypassing. Low inductance ceramic disk capacitors
with short lead lengths (< 0.5 inch) should be used. A 1
μ
F
low ESR film capacitor in parallel with two 0.1
μ
F low ESR
ceramic capacitors, (such as AVX RAM Guard
), provides
adequate bypassing. Connect one ceramic capacitor di-
rectly between pins 1 and 4. Connect the second ceramic
capacitor directly between pins 8 and 5.
Grounding
The high current capability of the MIC4421/4422 demands
careful PC board layout for best performance. Since the
MIC4421 is an inverting driver, any ground lead impedance
will appear as negative feedback which can degrade switch-
ing speed. Feedback is especially noticeable with slow-rise
time inputs. The MIC4421 input structure includes about
200mV of hysteresis to ensure clean transitions and free-
dom from oscillation, but attention to layout is still recom-
mended.
Figure 5 shows the feedback effect in detail. As the MIC4421
input begins to go positive, the output goes 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 MIC4421 ground pins. If the driving logic is
referenced to power ground, the effective logic input level is
reduced and oscillation may result.
To insure optimum performance, separate ground traces
should be provided for the logic and power connections.
Connecting the logic ground directly to the MIC4421 GND
pins will ensure full logic drive to the input and ensure fast
output switching. Both of the MIC4421 GND pins should,
however, still be connected to power ground.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4421YM | 功能描述:功率驅(qū)動(dòng)器IC High Speed, 9A Low Side MOSFET Driver (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MIC4421YM TR | 功能描述:功率驅(qū)動(dòng)器IC High Speed, 9A Low Side MOSFET Driver (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MIC4421YM-TR | 制造商:Micrel Inc 功能描述: |
| MIC4421YN | 功能描述:功率驅(qū)動(dòng)器IC High Speed, 9A Low Side MOSFET Driver (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MIC4421ZM | 功能描述:功率驅(qū)動(dòng)器IC High Speed, 9A Low Side MOSFET Driver (Pb-Free) RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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