TDA7572 datasheet(21/64 Pages) STMICROELECTRONICS

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TDA7572

Electrical specifications

21/64

4.3.4

Oscillator

Table 9.

Oscillator

Symbol

Parameters

Test conditions

Min.

Typ.

Max.

Units

Internal oscillator

FPWM_NOM Switching frequency

PWMCLOCK=[0 1]

100K

120

140K

KHz

PWMCLOCK=[1 0]

FPWM_NOM

PWMCLOCK=[0 0]

FPWM_NOM

CLKDC

Duty cycle

VCLK_High

Maximum voltage level

Clock output high value

Load = 20Kohm and 100pF

to buffered SVR

VP25-0.1

VP25

VCLK_Low

Minimum voltage level

Clock output low value

Load = 20Kohm and 100pF

to buffered SVR

VM25-0.1

VM25

VCLK-P-P

Peak-peak voltage

Load = 20Kohm and 100pF

to SVR

-10%

4.7

+10%

Dither cap charge current Dither pin voltage= 2.5V

-20%

100

+20%

µA

Dither cap discharge

current

-20%

100

+20%

µA

Peak-peak dither voltage

swing

1.4

1.6

1.7

Dither external clock

determination

Voltage at the dither pin at to

select external clock function

VDIG-0.2

No dither

Voltage at the dither pin at

which no dither will occur

VDGND

+0.2

Peak FPWM increase due

to dither

Cdither=100nF

+10

+12

Peak FPWM decrease due

to dither

Cdither=100nF

-8

-10

-12

Triangular peak value

VGND+

VDIG-

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