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DC1497A

P1-P3P4-P6
1
dc1497af
DEMO MANUAL DC1497A
Description
LT3597
60V Triple Step-Down
LED Driver
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
REF
. The switching frequency is set to 1MHz on the
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.
Figure 1. PWM Dimming
I
LED
50mA/DIV
PWM
2V/DIV
DC1497a
200ns/DIV
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dc1497af
DEMO MANUAL DC1497A
perForMAnce sUMMArY
(T
A
= 25°C)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
* Input Supply 6 55 V
V
LED
LED String Voltage 28 34 V
V
OUT(MAX)
Maximum Output Voltage 38 V
I
OUT
Output Current R23 = R24 = R25 = 20k 98 100 102 mA
DIM PWM Dimming Ratio PWM Dimming Frquency = 100Hz 10,000:1
FSW Switching Frequency R22 = 33.2k 0.9 1 1.1 MHz
EFE Efficiency V
IN
= 48V, V
OUT
= 29V, I
OUT
= 100mA, BIAS = 5V, No Dimming 87 %
*Actual V
IN
range should be determined by the load. For 9 white LEDs per channel, use a 48V input for evaluation.
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dc1497af
DEMO MANUAL DC1497A
Figure 2. Demo Board Setup
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
IN
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.
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
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.
qUick stArt proceDUre
P1-P3P4-P6

DC1497A

Mfr. #:
Buy DC1497A
Manufacturer:
Analog Devices Inc.
Description:
LED Lighting Development Tools LT3597EUHG Demo Board: 60V Triple Step-D
Lifecycle:
New from this manufacturer.
Delivery:
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