10

Am79574 Data Sheet

SWITCHING WAVEFORMS

Notes:

2. Overload level is defined when THD = 1%.

4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests.

5. These tests are performed with a longitudinal impedance of 90

Ω and metallic impedance of 300 Ω for frequencies below

12 kHz and 135

Ω for frequencies greater than 12 kHz. These tests are extremely sensitive to circuit board layout.

6. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.

7. When the SLIC is in the anti-sat 2 operating region, this parameter is degraded. The exact degradation depends on system

design. The anti-sat 2 region occurs at high loop resistances when

V

8. Midpoint is defined as the connection point between two 300

Ω series resistors connected between A(TIP) and B(RING).

9. Fundamental and harmonics from 256 kHz switch-regulator chopper are not included.

10. Calculate loop-current limit using the following equations:

E1 to DET*

E0 to DET

E1*

E0

DET

tshdd

tshd0

tgkdd

tgkd0

Notes:

*

E1 is internally connected to a logical 0.

1. All delays measured at 1.4 V level.

DET*

E1*

tgkde

tshde

tgkde

tshde

In OHT state:

In Active state:

I

LIMI T

0.5

V

APPA RENT

R

FEED

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

=

I

LIMI T

0.8

V

APP AREN T

R

FEED

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

=