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LCPB Scheda tecnica(PDF) 6 Page - Linear Technology |
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LCPB Scheda tecnica(HTML) 6 Page - Linear Technology |
6 / 16 page LT3590 6 3590f BLOCK DIAGRAM PIN FUNCTIONS SW (Pin 1/Pin 3): Switch Pin. Minimize trace area at this pin to minimize EMI. Connect the inductor at this pin. GND (Pins 2, 3, 4/Pin 2): Ground Pins. All ground pins should be tied directly to local ground plane. Proper soldering of these pins to the PCB ground is required to achieve the rated thermal performance. CTRL (Pin 5/Pin 1): Dimming and Shutdown Pin. Connect it below 100mV to disable the switcher. As the pin voltage is ramped from 0V to 1.5V, the feedback volt- age (VIN -VLED) ramps from 0mV to 200mV, controlling the LBD current. I VV R LED IN LED = − 1 VREG (Pin 6/Pin 6): Internally Generated 3.3V Regulated Output Pin. Must be locally bypassed with a 0.1μF X5R capacitor. LED (Pin 7/Pin 5): Connection point for the anode of the highest LED and the sense resistor. VIN (Pin 8/Pin 4): Input Supply Pin. Must be locally by- passed. Exposed Pad (NA/Pin 7): Ground. The Exposed Pad should be soldered to the PCB ground to achieve the rated thermal performance. (SC70/DFN) Figure 1. Block Diagram RQ S SW LED L1 470μH C3 0.1μF C2 1μF R1 6.8Ω VIN 48V C1 1μF VOUT VIN PWM REG VREG – + – + ∑ RAMP GENERATOR 850kHz OSCILLATOR GND CTRL CONTROL 3590 F01 ISNS – + + VREF 1.25V START-UP CONTROL EAMP A = 6.25 |
Codice articolo simile - LCPB |
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Descrizione simile - LCPB |
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