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| 型号： | MIC5021YN |
| 厂商： | Micrel Inc |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER MOSFET HI SIDE HS 8DIP |
| 标准包装： | 50 |
| 配置： | 高端 |
| 输入类型： | 非反相 |
| 延迟时间： | 500ns |
| 配置数： | 1 |
| 输出数： | 1 |
| 电源电压： | 12 V ~ 36 V |
| 工作温度： | -40°C ~ 85°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-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 1110 (CN2011-ZH PDF) |
| 其它名称： | 576-1240 |
10μF
2 7
2.7
nF
MIC5021
Logic-Level MOSFET Precautions
Logic-level MOSFETs have lower maximum gate-to-source
voltage ratings (typically ±10V) than standard MOSFETs
(typically ±20V). When an external MOSFET is turned on,
the doubling effect of the boost capacitor can cause the
gate-to-source voltage to momentarily exceed 10V. Internal
zener diodes clamp this voltage to 16V maximum which
is too high for logic-level MOSFETs. To protect logic-level
MOSFETs, connect a zener diode (5V≤V Zener <10V) from
gate to source.
Overcurrent Limiting
A 50mV comparator is provided for current sensing. The low
level trip point minimizes I 2 R losses when a power resistor
is used for current sensing.
The adjustable retry feature can be used to handle loads with
high initial currents, such as lamps or heating elements, and
can be adjusted from the C T connection.
C T to ground maintains gate drive shutdown following an
overcurrent condition.
C T open, or a capacitor to ground, causes automatic retry.
The default duty cycle (C T open) is approximately 20%. Refer
to the electrical characteristics when selecting a capacitor for
reduced duty cycle.
Micrel, Inc.
A 0.01μF boost capacitor is recommended for best perfor-
mance in the 12V to 20V range. Refer to ?gure 1. Larger
capacitors may damage the MIC5021.
+12V to +36V
MIC5021
1 8
V DD V BOOST
TTL Input Input Gate
3 6
C T Sense-
4 5
Gnd Sense+
Load
Figure 2. 12V to 36V Con?guration
If the full 12V to 36V voltage range is required, the boost
capacitor value must be reduced to 2.7nF. Refer to Figure
2. The recommended con?guration for the 20V to 36V range
is to place the capacitor is placed between V DD and V BOOST
as shown in Figure 3.
+12V to +36V
C T through a pull-up resistor to V DD increases the duty cycle.
Increasing the duty cycle increases the power dissipation
in the load and MOSFET under a “fault” condition. Circuits
may become unstable at a duty cycle of about 75% or higher,
depending on conditions. Caution: The MIC5021 may be
damaged if the voltage applied to C T exceeds the absolute
maximum voltage rating.
10μF
TTL Input
1
2
3
4
MIC5021
V DD V BOOST
Input Gate
C T Sense-
Gnd Sense+
8
7
6
5
0.01
μF
Boost Capacitor Selection
The boost capacitor value will vary depending on the supply
voltage range.
+12V to +20V
Load
10μF
TTL Input
1
2
3
4
MIC5021
V DD V BOOST
Input Gate
C T Sense-
Gnd Sense+
8
7
6
5
0.01
μF
Load
Figure 3. Preferred 20V to 36V Con?guration
Do not use both boost capacitor between V BOOST and the
MOSFET source and V BOOST and V DD at the same time.
Current Sense Resistors
Lead length can be signi?cant when using low value (< 1Ω)
resistors for current sensing. Errors caused by lead length
can be avoided by using four-teminal current sensing re-
sistors. Four-terminal resistors are available from several
manufacturers.
Figure 1. 12V to 20V Con?guration
MIC5021
6
July 2005
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