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Description
Demonstration circuit 1744A is an off-line isolated flyback
converter featuring the LT
signed to drive a single LED from an input voltage range
of 90V AC to 270V AC. It is also designed to comply with
IEC 61000-3-2 Class C harmonics standard and EN55015B
conducted EMI standard.
The LT3799 controls an isolated flyback converter in
boundary mode, suitable for LED applications requiring
4W to over 100W of LED power. Its novel current sensing
scheme delivers a well-regulated output current to the
secondary side without using an opto-coupler. Its unique
bleeder circuit makes the LED driver compatible with
perForMAnce sUMMArY
PARAMETER
Input Range
Output Current I
OUT
Maximum Output Voltage
Minimum Output Voltage
Arrow.com.
Downloaded from
3799. The demo board is de-
®
(T
= 25°C)
A
CONDITIONS
Line Frequency, 50Hz/60Hz
V
= 120V AC, V
IN
DEMO MANUAL DC1744A
Offline Isolated Flyback
LED Driver with PFC
TRIAC dimmers without additional components. Open-
and shorted-LED protection ensures long-term reliability.
The LT3799 is available in a low profile, thermally-enhanced
16-lead MSOP package.
The LT3799 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 1744A.
Design files for this circuit board are available at
http://www.linear.com/demo.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
= 3.6V
LED
LT3799
VALUE (TYPICAL)
90V AC to 270V AC
1.07A
5V
3V
dc1744afa
1
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Related Manuals for Linear Technology DC1744A
Summary of Contents for Linear Technology DC1744A
- Page 1 Its unique bleeder circuit makes the LED driver compatible with L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
NOTE: Make sure that the input voltage does not exceed DAMAGE, AND EVEN LIFE-THREATHENING INJURIES. the maximum input voltage (270V AC). CONTACT LINEAR TECHNOLOGY APPLICATIONS EN- 4. Check for the proper output current. GINEERS FOR PROPER COMPONENT REPLACEMENT. Once the proper output currents are established, adjust... - Page 3 DEMO MANUAL DC1744A qUick stArt proceDUre TRIAC ANGLE (DEG) DC1744 F02 Figure 2. LED Current vs TRIAC Angle (120V AC Application) 0.99 0.97 0.95 0.93 0.91 0.89 0.87 0.85 110 130 170 190 230 250 (VAC – RMS) DC1744A F03 Figure 3.
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Page 4: Parts List
DEMO MANUAL DC1744A pArts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components RECTIFIER, BRIDGE 600V 0.8A DIODES INC. HD06-T CAP , 33nF 20% 310V AC MKP VISHAY BFC233920333 CAP , 1812 22nF 5% 630V C0G TDK C4532C0G2J223J CAP , 1210 10µF 20% 50V X7S... -
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.
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