Linear Technology DC1497A Demo Manual

Description
Demonstration circuit 1497A is a 60V triple step-down LED
driver featuring the LT3597. The demo board is optimized
for 9 white LEDs, 100mA output per regulator from a 48V
input. When different number or different color of LEDs
is used for evaluation, attentions should be given to the
maximum output voltage setting and fault reporting. The
connections between the board and LEDs strings should
be as short as feasible.
The circuit achieves 10,000:1 PWM dimming at 100Hz
PWM frequency. LED dimming can also be done by analog
control of the CTRL1-3 pin. If dimming is not required,
leave the PWM1-3 and CTRL1-3 terminals unconnected.
The demo circuit pulls PWM1-3 and CTRL1-3 pins up
to V
demo circuit for best solution size. The LT3597 internal
compensation makes it a lot easier for a designer to design
different application circuits.
The LT3597 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1497A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
PWM
2V/DIV
I
LED
50mA/DIV
200ns/DIV
Figure 1. PWM Dimming
DEMO MANUAL DC1497A
60V Triple Step-Down
. The switching frequency is set to 1MHz on the
REF
DC1497a
LT3597
LED Driver
dc1497af
1