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SM8122AH Scheda tecnica(PDF) 5 Page - Nippon Precision Circuits Inc |
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SM8122AH Scheda tecnica(HTML) 5 Page - Nippon Precision Circuits Inc |
5 / 13 page SM8122A NIPPON PRECISION CIRCUITS INC.—5 OPERATION OVERVIEW The SM8122A basic structure is a step-up DC/DC converter. The booster control employs Pulse Width Modu- lation (PWM) which controls the pulse duty cycle (85% max.) at constant frequency (2.0MHz typ.). The LED current is set by a current-setting resistor R1 connected between pins FB (with stable voltage of 0.5V typ.) and VSS. When the switching transistor SW-Tr is ON, energy is stored in the inductor L. When SW-Tr is rapidly switched OFF, the energy stored in the inductor generates a voltage across the terminals of the inductor. The induced voltage, after being added to the input voltage, turns ON the Schottky barrier diode SBD and the stored energy is transferred to the output capacitor. This sequence of events continues repeatedly, boosting the output voltage. The SM8122A features a built-in soft-start function. The soft-start time is approximately 500 µs from after the chip enable input CE rising edge. During this interval, the maximum duty is restricted. R1 SBD L 4.7 µH CIN 4.7 µF VIN 2.3 to 5.5V COUT 1.0 µF Enable Disable LED CE SW VSS VDD FB Buff SOFT START OSC PWM COMP RAMP GENERATOR VOUT OVP COMP VREF ERR AMP |
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