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參數(shù)資料
| 型號： | MIC4452CT |
| 廠商： | MICREL INC |
| 元件分類： | 功率晶體管 |
| 英文描述： | 12A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process |
| 中文描述： | 12 A BUF OR INV BASED MOSFET DRIVER, PSFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 105K |
| 代理商： | MIC4452CT |
5-76
April 1998
MIC4451/4452
Micrel
Applications Information
Supply Bypassing
Charging and discharging large capacitive loads quickly
requires large currents. For example, changing a 10,000pF
load to 18V in 50ns requires 3.6A.
The MIC4451/4452 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.
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 ad-
equate 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 MIC4451/4452 demands
careful PC board layout for best performance. Since the
MIC4451 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 MIC4451 input structure includes 200mV of
hysteresis to ensure clean transitions and freedom from
oscillation, but attention to layout is still recommended.
Figure 5 shows the feedback effect in detail. As the MIC4451
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 MIC4451 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 MIC4451 GND
pins will ensure full logic drive to the input and ensure fast
output switching. Both of the MIC4451 GND pins should,
however, still be connected to power 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
MIC4451
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
+
+
+
DRIVE
LOGIC
φ
1DRIVE SIGNAL
CONDUCTION ANGLE
CONTROL 0° TO 180°
CONDUCTION ANGLE
CONTROL 180° TO 360°
MIC4451
VDD
1μF
VDD
MIC4452
VDD
1μF
VDD
φ
1
M
φ
3
φ
2
PHASE 1 OF 3 PHASE MOTOR
DRIVER USING MIC4451/4452
相關PDF資料 |
PDF描述 |
|---|---|
| MIC4467 | Quad 1.2A-Peak Low-Side MOSFET Driver(四輸出 最大峰值輸出電流1.2A 低邊MOS場效應管驅(qū)動器) |
| MIC4467BN | Quad 1.2A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS |
| MIC4467BWM | Quad 1.2A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS |
| MIC4467CN | Quad 1.2A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS |
| MIC4467CWM | Quad 1.2A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4452CTL3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC4452YM | 功能描述:功率驅(qū)動器IC 12A Hi-Speed, Hi-Current Single MOSFET Driver (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MIC4452YM TR | 功能描述:功率驅(qū)動器IC 12A Hi-Speed, Hi-Current Single MOSFET Driver (Lead Free) RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MIC4452YM | 制造商:Micrel Inc 功能描述:MOSFET Driver IC |
| MIC4452YMTR | 制造商:Micrel 功能描述:MOSFET Driver 12A 1-Out Lo Side Non-Inv |
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