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| 型号： | TC429MJA |
| 厂商： | Microchip Technology |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC MOSFET DRIVER 6A HS 8CDIP |
| 标准包装： | 56 |
| 配置： | 低端 |
| 输入类型： | 反相 |
| 延迟时间： | 53ns |
| 电流 - 峰： | 6A |
| 配置数： | 1 |
| 输出数： | 1 |
| 电源电压： | 7 V ~ 18 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-CERDIP |
| 包装： | 管件 |
TC429
4.0
4.1
APPLICATIONS INFORMATION
Supply Bypassing
V DD = 18V
Charging and discharging large capacitive loads
quickly requires large currents. For example, charging
a 2500 pF load to 18V in 25 nsec requires a 1.8A
1, 8
1 μF
0.1 μF
current from the device's power supply.
To ensure low supply impedance over a wide frequency
range, a parallel capacitor combination is recom-
mended for supply bypassing. Low-inductance ceramic
disk capacitors with short lead lengths (< 0.5 in.)
should be used. A 1 μF film capacitor in parallel with
Input
2
TC429
6, 7
Output
C L = 2500 pF
one or two 0.1 μF ceramic disk capacitors normally
provides adequate bypassing.
4.2 Grounding
The high-current capability of the TC429 demands
careful PC board layout for best performance. Since
+5V
Input
4, 5
Input: 100 kHz,
square wave,
t RISE = t FALL ≤ 10 nsec
90%
the TC429 is an inverting driver, any ground lead
impedance will appear as negative feedback that can
degrade switching speed. The feedback is especially
noticeable with slow rise-time inputs, such as those
0V
18V
10%
t D1
90%
t F
t D2
t R
90%
produced by an open-collector output with resistor pull-
up. The TC429 input structure includes about 300 mV
of hysteresis to ensure clean transitions and freedom
Output
0V
10%
10%
from oscillation, but attention to layout is still
recommended.
Figure 4-3 shows the feedback effect in detail. As the
TC429 input begins to go positive, the output goes
negative and several amperes of current flow in the
ground lead. A PC trace resistance of as little as 0.05 ?
can produce hundreds of millivolts at the TC429 ground
pins. If the driving logic is referenced to power ground,
the effective logic input level is reduced and oscillations
may result.
FIGURE 4-1:
Time Test Circuit.
Inverting Driver Switching
INPUT
To ensure optimum device performance, separate
ground traces should be provided for the logic and
power connections. Connecting logic ground directly to
the TC429 GND pins ensures full logic drive to the input
OUTPUT
CL = 2500pF
V S = 18V
and fast output switching. Both GND pins should be
connected to power ground.
5V
5V
TIME (100ns/DIV)
INPUT
OUTPUT
TIME (100ns/DIV)
100ns
CL = 2500pF
V S = 7V
100ns
DS21416C-page 8
FIGURE 4-2:
Switching Speed.
? 2003 Microchip Technology Inc.
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