- 31 Июл 2007
25 to 30pin. S1 to S6, 35pin. VREFМарк С сказал(а):Изучаю даташит.
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S terminal is a connecting terminal for LED constant current setting resistor, output current ILED is in an inverse relationship
to the resistance value.
VREF terminal is a terminal for analog dimming; output current ILED is in a proportional relationship to the voltage value to
VREF terminal is assumed that it is set by dividing the resistance with a high degree of accuracy, VREF terminal inside the
IC is in open state (High Impedance). It is necessary to input voltage to divide the resistance from the output of REG9V or
use external power source. Using the terminal in open state needs to be avoided.
The relationship among output current ILED, VREF input voltage, and RS resistance has the following equation:
The voltage of S terminal is following equation:
*Attention: Rises LED current accelerate heat generation of IC. Adequate consideration needs to be taken to thermal design