L6229 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L6229

DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR

STMicroelectronics 

L6229

verse recovery of the freewheeling diodes. The L6229 provides a 1µs Blanking Time tBLANK that inhibits the

comparator output so that the current spike cannot prematurely retrigger the monostable.

Figure 10. PWM Current Controller Simplified Schematic

TO GATE

LOGIC

5mA

(0)

(1)

S

Q

R

-

5V

+

2.5V

BLANKING TIME

MONOSTABLE

1µs

VSB

FROM THE

LOW-SIDE

GATE DRIVERS

MONOSTABLE

SET

BLANKER

DRIVERS

+

DEAD TIME

DRIVERS

+

DEAD TIME

VSA

DRIVERS

+

DEAD TIME

VS

OUT2

OUT3

OUT1

COFF

RCOFF

ROFF

+

SENSE

-

COMPARATOR

VREF

SENSEB

RSENSE

SENSEA

D02IN1380

Figure 11. Output Current Regulation Waveforms

IOUT

VREF

RSENSE

tOFF

tON

tOFF

VSENSE

VREF

0

1µs tBLANK

Slow Decay

1µs tBLANK

Slow Decay

VRC

5V

tRCRISE

tRCRISE

2.5V

ON

tRCFALL

1µs tDT

tRCFALL

1µs tDT

OFF SYNCHRONOUS RECTIFICATION

D02IN1351

B

C

DAB

C

D

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