LINEAR TECHNOLOGY LTC3202 White LED Driver Fractional Charge Pump User Guide
- June 12, 2024
- LINEAR TECHNOLOGY
Table of Contents
LINEAR TECHNOLOGY LTC3202 White LED Driver Fractional Charge Pump
Product Information
- Product Name: Demonstration Circuit 633
- Product Model: LTC3202
- Product Type: White LED Driver Fractional Charge Pump
Product Usage Instructions
- Before starting, ensure that you have the following equipment:
- A 3.3V, 500mA bench supply
- Oscilloscope probe
- Refer to Figure 1 for the proper equipment setup.
- Measure the input or output voltage ripple by touching the oscilloscope probe tip directly across the Vin or Vout and Gnd terminals, as shown in Figure 2.
- Follow the steps below to set up and evaluate the white LED driver circuit:
- Connect the 3.3V, 500mA bench supply to the Vin and Gnd terminals.
- Set jumpers JP1 and JP2 to the 1 position.
- Turn on the input supply and observe that the white LEDs light up. The VFB voltage should measure approximately 0.6V.
- To adjust brightness:
* For 2/3 brightness, connect JP1 to the 0 position and leave JP2 in the 1 position.
* For 1/3 brightness, connect JP2 to the 0 position and leave JP1 in the 1 position.- If you need design files for this circuit board, please contact the LTC factory.
QUICK START PROCEDURE
Demonstration circuit 633 is easily set up to evaluate the high efficiency of the LTC3202, low-noise white LED driver circuit. Refer to Figure 1 for proper equipment setup and follow the procedure outlined below.
NOTE:
When measuring the input or output voltage ripple, care must be taken to avoid
a long lead on the oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the Vin or Vout and Gnd
terminals, as shown in Figure 2.
- Before turning “ON” the power supply, connect a 3.3V, 500mA bench supply to the Vin and Gnd terminals.
- Set jumpers JP1 and JP2 to the “1” position.
- Turn “ON” the input supply and observe that the white LEDs light up. The VFB voltage should measure approximately 0.6V.
- For 2/3 brightness connect JP1 to the “0” position and leave JP2 in the “1” position. For 1/3 brightness connect JP2 to the “0” position and leave JP1 in the “1” position.
Design files for this circuit board are available. Call the LTC factory.
DEMONSTRATION CIRCUIT 633
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 633
WHITE LED DRIVER FRACTIONAL CHARGE PUMP
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