OSCILLATOR FREQUENCY

The frequency of the internal oscillator can be

programmed using external resistor and capacitor.

The nominal oscillator frequency can be calcu-

lated using the following equation:

=

1

2

=

1

1.3863

pacitor

°C; unlessotherwise specified.)

Symbol

Pin

Parameter

Test Condition

Min.

Typ.

Max.

Unit

8.3

9

9.7

V

7.3

8

8.7

V

0.7

1

1.3

V

14.6

15.6

16.6

V

Start Up Current

150

250

µA

Quiescent Current

500

700

µA

8

Leakage Current BOOT pin vs

GND

5

µA

6

Leakage Current OUT pin vs GND

5

µA

7

High Side Driver Source Current

110

175

mA

High Side Driver Sink Current

190

275

mA

5

Low Side Driver Source Current

110

175

mA

Low Side Driver Sink Current

190

275

mA

2

RF High Level Output Voltage

V

RF Low Level Output Voltage

50

200

mV

3

CF Upper Threshold

7.7

7.95

8.2

V

CF Lower Threshold

3.80

4.05

4.3

V

Internal Dead Time

L6571A

L6571B

0.85

0.50

1.25

0.72

1.65

0.94

µs

µs

Duty Cycle, Ratio Between

Dead Time + Conduction Time

of High Side and Low Side

Drivers

0.45

0.5

0.55

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

T1

LVG

D96IN434

V

SUVP

Figure 2: WAVEFORMS

L6571A - L6571B

3/7