A1610 Alpha Microelectronics, A1610 Datasheet - Page 6

• Manufacturer Part Number: A1610
• Description: Coil Driver ic
• Manufacturer: Alpha Microelectronics

IRCR
By external resistance R
voltage at this pin is in relationship to an internal voltage of 1.5 V.
A reference current of 50 µA require a value R
The tolerance and the temperature coefficient of the resistance R
tolerance and the temperature coefficient the I
OD
At this output the voltages of the both thermal reference diodes available for measurement and evaluation
purposes.
The voltage V
The output may be loaded with 50 nA maximally.
INPT
The internal current source at the input INPT drives a current of 50 µA.
The voltage at the external resistance R
diodes.
The value of the resistor is used to set the chip cut-off temperature of the thermal protection infinitely
variable between T
If the input INPT is connected to GND the thermal protection is inactive. If the input INPT is open, e.g. at
cable interruption, the output switches to Low (emergency cut-out).
The hysteresis of the thermal protection is typical 12 K and is produced by changing of the current
(50 µA / 25 µA) by the both Thermo-reference diodes.
The external resistance for a definite chip cut-off temperature T
The calculated chip cut-off temperature is (T
The tolerance of the chip cut-off temperature is typical r 6 K.
Instead of using the resistor R
voltage source.
The Thermal Protection Circuit has a filter for gating out of short-term drops be caused by switching of the
output stage. At overtemperature the Low signal at the Comparator output in the Interference Suppression
will be saved in a scratch pad about 200 ns before every Low-High-Slope of the output signal.
With the next L/H-Slope of the output signal this Low Signal will be latched from the scratch pad into the
Latch.
The scratch pad and the Latch will be getting a reset signal if the comparator output goes to High.
This ensures fading down of incidental failures at the inquiry time.
In the case of standby or during the Indication State the rectangular oscillator signal takes over the control
of the scratch pad and the latch.
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OD
(I
TC_V
R
T
RREF
joff
PT
has a temperature coefficient
joff
= 22 k: - 0,058 k:/K * (T
= [V
OD
= 80 to 175 °C.
= 1.5 V / 30 k:).
REF
OD( at TMes
~ - 4 mV/K.
the reference current for the internal control currents is produced. The
PT
the chip cut-off temperature is adjustable by using of external Low-ohm
)
– ((|I
PT
INPT (at TMes)
alpha microelectronics gmbh
is internal compared to the voltage of the both reference
Mes
joff
INPT
REF
= measuring temperature):
- 60 °C)
= 30 k:
and f
|
*R
OSC
PT
)
.
+ 6 mV)] / 4 mV/K + T
joff
REF
’s calculated approximately as follows:
are directly entered into the
Mes
October 2000