Linear Technology DC1947A Manual
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Linear Technology DC1947A Manual

Offline isolated flyback led driver with pfc
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DESCRIPTION
Demonstration circuit 1947A is an off-line isolated flyback
LED driver featuring
a single constant current output of 1A over an LED string
voltage from 30V to 50V. It is optimized to operate over a
wide AC input voltage range (90VAC to 277VAC, 47Hz to
63Hz). It provides a high power factor (>0.9) enabling a
single design to be used worldwide. It is also designed to
comply with the IEC 61000-3-2 Class C harmonics standard
and the EN55015B conducted EMI standard.
The LT3799-1 controls an isolated flyback converter in
boundary mode. Its novel current sensing scheme deliv-
ers a well-regulated output current to the secondary side
without using an opto-coupler. Open- and shorted-LED
protection ensures long term reliability.
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Current I
OUT
Output Voltage
Open LED Voltage
Note 1: For applications with low LED string voltage, FB pin divider resistor R4 and output clamp D9 can be adjusted to reduce the open voltage limit.
See "Protection from Open LED and Shorted LED Faults" section in the data sheet for detail.
Arrow.com.
Downloaded from
®
LTC
3799-1
. The demo board provides
CONDITIONS
Line Frequency, 47Hz to 63Hz
V
= 120VAC, V
IN
(Note 1)
DEMO MANUAL DC1947A
Offline Isolated Flyback LED
The LT3799-1 is available in a low profile, thermally-
enhanced 16-lead MSOP package.
The LT3799-1 data sheet gives a complete description
of the device, operation and application information. The
data sheet must be read in conjunction with this quick
start guide for demo circuit 1947A.
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.
(T
= 25°C)
A
= 48V
LED
LT3799-1
Driver with PFC
MIN
TYP
MAX
90
230
277
1
30
48
50
54
UNITS
VAC
A
V
V
dc1947af
1

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Summary of Contents for Linear Technology DC1947A

  • Page 1 Its novel current sensing scheme deliv- ers a well-regulated output current to the secondary side 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 AND EVEN LIFE-THREATENING INJURIES. CONTACT the maximum input voltage (277VAC). LINEAR TECHNOLOGY APPLICATIONS ENGINEERS FOR PROPER COMPONENT REPLACEMENT. 4. Check for the proper output current. Demonstration circuit 1947A is easy to set up to evalu- Once the proper output currents are established, adjust the ate the performance of the LT3799-1.
  • Page 3 DEMO MANUAL DC1947A QUICK START PROCEDURE 1.00 0.98 0.96 0.94 0.92 0.90 110 130 150 170 190 210 230 250 270 110 130 150 170 190 210 230 250 270 90 110 130 150 170 190 210 230 250 270...
  • Page 4 DEMO MANUAL DC1947A QUICK START PROCEDURE Output Voltage and Switch Node Voltage During Output Open 10V/DIV 10V/DIV 200V/DIV 200V/DIV 200ms/DIV DC1947a F09 200ms/DIV DC1947a F10 Figure 10. V = 230VAC Figure 9. V = 120VAC Output Current and Switch Node Voltage During Output Short...

  • Page 5: Parts List

    DEMO MANUAL DC1947A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components RECTIFIER, BRIDGE 600V, 0.8A DIODES INC., HD06-T CAC1 CAP , 0.1μF , 310V, 20% VISHAY, BFC233922104 CAP , FILM, 0.22μF , 450V, 10% RUBYCON, 450MPH224K CAP , 10μF , 20%, 50V, ALUM...

  • Page 6: Part Description

    DEMO MANUAL DC1947A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components R22(OPT) RES, CHIP ., 0805 Hardware—For Demo Board Only J1, J2 TERMINAL BLOCK, 2 POSITION WEIDMULLER, 1715250000 MH1 to MH4 STAND-OFF , NYLON,0.25" KEYSTONE, 8831(SNAP ON) dc1947afb Arrow.com.

  • Page 7: 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 8 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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Lt3799-1

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