TA7612AP(2002) View Datasheet(PDF) - Toshiba
Part Name
Description
MFG CO.
TA7612AP Datasheet PDF : 7 Pages
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Functional Description
Block diagram
TA7612AP
The above simplified TA7612AP Block Diagram is to give the general idea of the circuit's operation.
(1) General operation
If VIN Voltage greater than the first threshold but less than the second threshold is applied “No.1”
LED is lighted, if the input voltage is between the second and the third threshold, then 'No.1 and
No.2' LED are in operation and so on.
(2) Adding R1 and R2 operation
These resistors are to give the reference voltage of 10 comparators.
And then above VB − VA is to give the Input Voltage sensitivity of this device.
R1 and R2 will be calculated as follows.
How to adjust the dimmer
Toshiba recommends that the value of the resistor at pin 8 be set to 10 kΩ (up to 100 kΩ).
If the value of the resistor is set lower, the current that flows through each VO1~10 and the power dissipation
will increase. Thus, when setting the value of the resistor, care must be taken with the relationship between the
power dissipation (max) and the current that is required to drive LEDs.
3
2002-10-29
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