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LT3791 Datasheet(PDF) 3 Page - Linear Technology |
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LT3791 Datasheet(HTML) 3 Page - Linear Technology |
3 / 8 page 3 dc1666af DEMO MANUAL DC1666A DemonstrationcircuitDC1666Aiseasytosetuptoevaluate theperformanceoftheLT3791.Followtheprocedurebelow: NOTE: PWM must be pulled high to run. If PWM is not used, connect PWM to a 5V source or to INTVCC on the PCB using 0Ω resistor R22. 1. Connect a string of LEDs that will run with forward volt- age less than 25.5V, but greater than 9.5V, to the LED+ and LED– terminals on the PCB as shown in Figure 1. 2. Connect the EN/UVLO terminal to GND. 3. With power off, connect the input power supply to the PVIN and GND terminals. Make sure that the PVIN DC input voltage will not exceed 60V. 4. ConnectthePWMterminal.IfPWMisnotused,connect PWM to a 5V source or to INTVCC on the PCB using 0Ω resistor R22. PWM must be pulled high to run. 5. Turn the input power supply on and make sure the voltage is between 4.7V and 60V. 6. Release the EN/UVLO to GND connection. 7. Observe the LED string running at the programmed LED current. 8. For PWM dimming, connect a PWM (100Hz or higher is recommended) signal to the PWM terminal. For analog dimming, connect a DC voltage between 0V and 2V to the CTRL terminal. 9. Observe the reduction of brightness in the LED string when PWM or analog dimming. Quick start proceDure |
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Similar Description - LT3791 |
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