STK682-010-E

No.A2252-9/20

(7) DECAY mode

The DECAY mode of the output current becomes only MIXED DECAY.

FDT voltage

DECAY method

3.5V to

SLOW DECAY

1.1V to 3.1V or OPEN

MIXED DECAY

to 0.8V

FAST DECAY

(8) Chopping frequency setting function

Chopping frequency is set as shown below by a capacitor between OSC1 pin and GND.

Fch = 1 / (C1+20pF / 10×10-6) (Hz)

(Example) When Cosc1=100pF, the chopping frequency is shown below.

Fch = 1 / ((20+ 100)×10-12 / 10×10-6) (Hz) = 83.3 (kHz)

Note

 The 20pF is a stray capacitance which is involved by the package of STK682-010-E.

(9) Output short-circuit protection circuit

Build-in output short-circuit protection circuit makes output to enter in stand-by mode. This function prevents the IC

from damaging when the output shorts circuit by a voltage short or a ground short, etc. When output short state is

detected, short-circuit detection circuit starts the operating and output is once turned OFF. After the timer latch time

(typ : 256μs), output is turned ON again. Still the output is at short state, the output is turned OFF and fixed in

stand-by mode.

When output is fixed in stand-by mode by output short protection circuit, output is released the latch by setting Chip

enable terminal/ VCC="L"

(10) Internal DOWN pin

The DOWN pin is an open drain connection.

This pin is turned ON when no rising edge of CLK between the input signals while a period determined by a

capacitor between OSC2 and GND, and outputs at low levels.

The DOWN pin output in once turned ON, is turned OFF at the next rising edge of CLK.

Holding current switching time (0.6sectyp) is set by an internal capacitor between OSC2 pin and GND.

(11) Output current tolerance

0

0.5

1

1.5

2

2.5

3

3.5

0

10

20

30

40

50

60

70

80

90

100 110

STK682-010-E Output current tolerance Io Tc

Operating substrate temperature Tc C

1-2 phase excitation

and more

2 phase excitation