MC33035 Просмотр технического описания (PDF) - Motorola => Freescale

Номер в каталоге

Компоненты Описание

производитель

MC33035

BRUSHLESS DC MOTOR CONTROLLER

Motorola => Freescale 

MC33035

Figure 27. MOSFET Drive Precautions

21

Rg

D

20

Rg

D

19

Rg

D

40 k

9

100 mV 15

23

D = 1N5819

Brake Input

Series gate resistor Rg will dampen any high frequency oscillations caused

by the MOSFET input capacitance and any series wiring induction in the

gate–source circuit. Diode D is required if the negative current into the Bot-

tom Drive Outputs exceeds 50 mA.

Figure 28. Bipolar Transistor Drive

C

21

C

20

C

19

40 k

9

100 mV 15

23

Brake Input

IB

+

0

t

–

Base Charge

Removal

The totem–pole output can furnish negative base current for enhanced tran-

sistor turn–off, with the addition of capacitor C.

Figure 29. Current Sensing Power MOSFETs

D SENSEFET

21

G

S

MK

20

19

9

15 RS

100 mV

16 Gnd

Power Ground:

To Input Source Return

[ @ @ ) VPin 9

RS Ipk RDS(on)

rDM(on) RS

If: SENSEFET = MPT10N10M

RS = 200 Ω, 1/4 W

Then : VPin 9 ≈ 0.75 Ipk

Control Circuitry Ground (Pin 16) and Current Sense Inverting Input (Pin 15)

must return on separate paths to the Central Input Source Ground.

Virtually lossless current sensing can be achieved with the implementation of

SENSEFET power switches.

Figure 30. High Voltage Boost Supply

VCC = 12 V

8

4

6

R

5

Q

S

2

1 MC1555

0.001

18 k

VM + 12

VM + 8.0

7

VM + 4.0 0

20 40 60

Boost Current (mA)

3

1.0/200 V

*

VBoost

1N5352A * 22

* = MUR115

VM = 170 V

This circuit generates VBoost for Figure 25.

MOTOROLA ANALOG IC DEVICE DATA

13

Share Link: