MIC5011(2000) データシートの表示（PDF） - Micrel

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MIC5011
(Rev.:2000)

Minimum Parts High- or Low-Side MOSFET Driver

Micrel 

MIC5011

Applications Information (Continued)

Micrel

7 to 15V

1N5817

100nF

Control Input

MIC5011

1 V+

C1 8

2 Input Com 7

3 Source C2 6

4 Gnd Gate 5

1N4001 (2)

+

10µF

IRF540

LOAD

Figure 4. Bootstrapped

High-Side Driver

100kΩ

10mA

Control Input

4N35

15V

33pF

33kΩ

To MIC5011

Input

MPSA05

100kΩ

1kΩ

Figure 5. Improved

Opto-Isolator Performance

Opto-Isolated Interface (Figure 5). Although the MIC5011

has no special input slew rate requirement, the lethargic

transitions provided by an opto-isolator may cause oscilla-

tions on the rise and fall of the output. The circuit shown

accelerates the input transitions from a 4N35 opto-isolator

by adding hysteresis. Opto-isolators are used where the

control circuitry cannot share a common ground with the

MIC5011 and high-current power supply, or where the

control circuitry is located remotely. This implementation is

intrinsically safe; if the control line is severed the MIC5011

will turn OFF.

Industrial Switch (Figure 6). The most common manual

control for industrial loads is a push button on/off switch.

The “on” button is physically arranged in a recess so that in

a panic situation the “off” button, which extends out from the

control box, is more easily pressed. This circuit is compat-

ible with control boxes such as the CR2943 series (GE).

The circuit is configured so that if both switches close

simultaneously, the “off” button has precedence.

This application also illustrates how two (or more) MOSFETs

can be paralleled. This reduces the switch drop, and distrib-

utes the switch dissipation into multiple packages.

High-Voltage Bootstrap (Figure 7). Although the MIC5011

is limited to operation on 4.75 to 32V supplies, a floating

bootstrap arrangement can be used to build a high-side

switch that operates on much higher voltages. The MIC5011

and MOSFET are configured as a low-side driver, but the

load is connected in series with ground.

Power for the MIC5011 is supplied by a charge pump. A

20kHz square wave (15Vp-p) drives the pump capacitor

and delivers current to a 100µF storage capacitor. A zener

24V

ON

CR2943-NA102A

(GE)

OFF

100kΩ

MIC5011

1 V+

C1 8

2 Input Com 7

3 Source C2 6

4 Gnd Gate 5

330kΩ

Figure 6. 50-Ampere

Industrial Switch

+

10µF

LOAD

IRFP044 (2)

MIC5011

8

July 2000

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