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Linear Technology DC1573A Demo Manual

Lt3760 8-channel 100ma high voltage led driver
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Description
DC1573A is an 8-Channel 100mA High Voltage LED Driver
featuring the LT
3760. The LT3760 drives up to 100mA
®
per string and has a maximum LED string voltage of 45V.
DC1573A is set at 1MHz switching frequency for smallest
inductor and capacitor size as well as maximum PWM
dimming performance. Overvoltage protection is set at
55V in case the LEDs are removed from the circuit. If the
LEDs are opened, the FAULT terminal output flag goes
low and reports the fault condition. The V
powered from 10V to 14V input separated from the 24V
PV
supply for best thermal performance. If one or more
IN
of the 8 LED channels is not used, its LED pin or terminal
should be tied to LED+ to disable it. Multiple channels can
be used in parallel for higher LED current by tying their
LED1-8 pins together.
perForMAnce sUMMArY
PARAMETER
PV
Power Input Voltage Range
IN
V
Pin Input Voltage Range
IN
Switching Frequency
LED String Current I
LED(1-8)
OVP Open LED Voltage
Efficiency
Undervoltage Lockout
Low Voltage Turn-On (UVLO + V
HYST
Peak Switch Current Limit
terminal is
IN
(T
= 25°C)
A
CONDITION
Operating
Operating
R
T
R14 = 5.76k
R8 = 11k, R7 = 20k
PV
R1 = 499k, R4 = 40.2k
)
R1 = 499k, R4 = 40.2k
R
S1
DEMO MANUAL DC1573A
High Voltage LED Driver
The LT3760 data sheet gives a complete description of
the part, operation and applications information. The data
sheet must be read in conjunction with this demo manual
for demonstration circuit 1573A. The LT3760 is assembled
in a small 28-lead FE (4.4mm TSSOP) package with a
thermally enhanced ground pad. Proper board layout is
essential for maximum thermal performance. See the
Layout Considerations section in the data sheet.
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.
= 39.2k
= 24V, V
= 10V, V
= 45V, I
IN
IN
LED
LED1-8
= 0.015Ω
8-Channel 100mA
VALUE (TYPICAL)
20V to 28V
8V to 14V
1MHz
100mA
55V
= 100mA
92%
20.1V
21.4V
3.3A
LT3760
dc1573af
1

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Summary of Contents for Linear Technology DC1573A

  • Page 1 If one or more L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of of the 8 LED channels is not used, its LED pin or terminal Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1573A qUick stArt proceDUre Demonstration circuit 1573A is easy to set up to evaluate 4. With power off, connect the V power supply to the the performance of the LT3760. Follow the procedure below: and GND terminals within the range specified on the PCB.

  • Page 3: Terminal Options

    LED+. If all LED+ to LED1-8 connections are left float- the CTRL terminal can be driven to dim the LEDs or a ing or are opened during operation, DC1573A powers the resistor divider (R2 and R5) from PV to GND can be output to 55V as programmed by OVPSET.

  • Page 4: Parts List

    DEMO MANUAL DC1573A pArts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1 Capacitor, 1210 4.7µF 20% 25V X7R TDK C3225X7R1E475M CIN2 Capacitor, 1210 4.7µF 10% 50V X7R AVX 12105C475KAT2A C1, C2, C3, C4, C5 Capacitor, 1210 2.2µF 10% 100V X7R Murata GRM32ER72A225KA35L Capacitor, 0805 4.7µF 10% 10V X5R...

  • Page 5: Schematic Diagram

    Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
  • Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1573A...

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