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参数资料
| 型号： | MIC4421BM |
| 厂商： | MICREL INC |
| 元件分类： | MOSFETs |
| 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, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 10/12页 |
| 文件大小： | 235K |
| 代理商： | MIC4421BM |
MIC4421/4422
Micrel, Inc.
August 2005
7
M9999-081005
Applications 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 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
12 LINE
OUTPUT VOLTAGE vs LOAD CURRENT
VOLTS
DRIVE
LOGIC
1DRIVE SIGNAL
CONDUCTION ANGLE
CONTROL 0° TO 180°
CONDUCTION ANGLE
CONTROL 180° TO 360°
MIC4451
VS
1F
VS
MIC4452
VS
1F
VS
1
M
3
2
PHASE 1 of 3 PHASE MOTOR
DRIVER USING MIC4420/4429
MIC4421
1F
50V
MKS2
UNITED CHEMCON SXE
0.1F
WIMA
MKS2
1
8
6, 7
5
4
0.1F
50V
5.6 k
560
+15
560F 50V
BYV 10 (x 2)
100F 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 1F low
ESR lm capacitor in parallel with two 0.1F 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 MIC4421/4422 demands
careful PC board layout for best performance. Since the
MIC4421 is an inverting driver, any ground lead impedance
willappearasnegativefeedbackwhichcandegradeswitching
speed. Feedback is especially noticeable with slow-rise time
inputs. The MIC4421 input structure includes about 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 MIC4421
input begins to go positive, the output goes negative and
several amperes of current ow in the ground lead. As little
as 0.05Ω 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. Con-
necting 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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