Linear Technology DC1497A Demo Manual page 3

qUick stArt proceDUre
Demonstration circuit 1497A is easy to set up to evalu-
ate the performance of the LT3597. Refer to Figure 2 for
proper measurement equipment setup and follow the
procedure below:
1. With power off, connect the input power supply to V
and GND.
2. With power off, connect a 5V bias supply to BIAS and
GND. Bias voltage should be less then 25V.
3. With power off, connect 3 LED strings, 9 white LEDs per
string, between LED1+ and LED1–, LED2+ and LED2–,
LED3+ and LED3– respectively.
DEMO MANUAL DC1497A
4. Turn on the power at the input. Be careful not to look
at the LEDs directly.
5. Carefully evaluate all design parameters as needed.
6. To evaluate PWM dimming, apply a PWM signal to
IN
PWM1, PWM2 and/or PWM3. To evaluate 10,000:1 PWM
dimming, the PWM signal should have a frequency of
100Hz and the minimum pulse width can be as low as
1µs.
7. To modify the demo board for other applications, please
contact the Linear Applications Group for help.
Figure 2. Demo Board Setup
dc1497af
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