L6571A_0009 datasheet(4/8 Pages) STMICROELECTRONICS

Part #	L6571A_0009

Description	HIGH VOLTAGE HALF BRIDGE DRIVER WITH OSCILLATOR

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L6571A L6571B

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OSCILLATOR FREQUENCY

The frequency of the internal oscillator can be programmed using external resistor and capacitor.

The nominal oscillator frequency can be calculated using the following equation:

Where RF and CF are the external resistor and capacitor.

The device can be driven in "shut down" condition keeping the CF pin close to GND, but some cares have to be

taken:

1. When CF is to GND the high side driver is off and the low side is on

2. The forced discharge of the oscillator capacitor CF must not be shorter than 1us: a simple way to do this is to

limit the current discharge with a resistive path imposing R · CF >1µs(see fig.1)

Figure 1.

Figure 2. Waveforms

DC

Duty Cycle, Ratio Between Dead

Time + Conduction Time of High

Side and Low Side Drivers

0.45

0.5

0.55

IAVE

1

Average Current from Vs

No Load, fs = 60KHz

1.2

1.5

mA

fout

6

Oscillation Frequency

RT = 12K; CT = 1nF

57

60

63

kHz

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

f

OSC

1

2R

F

C

F

In2

⋅⋅

⋅

-----------------------------------------

1

1.3863 R

F

C

F

⋅⋅

------------------------------------------

==

RF

CF

GNDM

1

2

3

4

8

7

6

5

fault signal

R

T1

TC

VS

VCF

LVG

D96IN434

VSUVP

ELECTRICAL CHARACTERISTCS (continued)

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