MIC5013BM datasheet(12/16 Pages) MICREL

12 / 16 page

MIC5013

Micrel

MIC5013

July 2000

Applications Information (Continued)

Fault

V+

Gate

MIC5013

Gnd

Thresh

Sense

Source

Input

Fault

V+

Gate

MIC5013

Gnd

Thresh

Sense

Source

Input

IRF541

1µF

20k

Ω

Figure 11. Half-Bridge

Motor Driver

100

Ω

100nF

1N4001 (2)

1N5817

15V

15k

Ω

IRF541

10µF

10k

Ω

22m

Ω

CPSL-3

(Dale)

22m

Ω

CPSL-3

(Dale)

1nF

10k

Ω

2N3904

22k

Ω

220pF

1N4148

22k

Ω

15V

12V,

10A Stalled

PWM

INPUT

The top-side driver is based on the bootstrapped circuit of

Figure 6, and cannot be switched on indefinitely. The

bootstrap capacitor (1

µF) relies on being pulled to ground

by the bottom-side output to recharge. This limits the

maximum duty cycle to slightly less than 100%.

Two of these circuits can be connected together to form an

H-bridge. If the H-bridge is used for locked antiphase

control, no special considerations are necessary. In the

case of sign/magnitude control, the “sign” leg of the H-

bridge should be held low (PWM input held low) while the

other leg is driven by the magnitude signal.

If current feedback is required for torque control, it is

available in chopped form at the bottom-side driver's 22 m

Ω

current-sensing resistor.

Time-Delay Relay (Figure 12). The MIC5013 forms the

basis of a simple time-delay relay. As shown, the delay

commences when power is applied, but the 100 k

Ω/1N4148

could be independently driven from an external source such

as a switch or another high-side driver to give a delay

relative to some other event in the system.

Hysteresis has been added to guarantee clean switching at

turn-on. Note that an over-current condition latches the

relay in a safe, OFF condition. Operation is restored by

either cycling power or by momentarily shorting pin 1 to

ground.

Motor Driver with Stall Shutdown (Figure 13). Tachom-

eter feedback can be used to shut down a motor driver

circuit when a stall condition occurs. The control switch is a

3-way type; the “START” position is momentary and forces

the driver ON. When released, the switch returns to the

“RUN” position, and the tachometer’s output is used to hold

the MIC5013 input ON. If the motor slows down, the tach

output is reduced, and the MIC5013 switches OFF. Resis-

tor “R” sets the shutdown threshold. If the output current

exceeds 30A, the MIC5013 shuts down and remains in that

condition until the momentary “RESET” button is pushed.

Control is then returned to the START/RUN/STOP switch.

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