Linear Technology DC1739B-C Demo Manual
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Linear Technology DC1739B-C Demo Manual

120w isolated forward converter with synchronous rectification
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DESCRIPTION
Demonstration circuit 1739B-C is a 120W isolated forward
converter with synchronous rectification featuring the
LTC
3765/LTC3766
®
This circuit was designed to demonstrate the high level of
performance, efficiency, and small solution size attainable
using this chip set in an active-clamp-reset forward con-
verter power supply. It operates at 240kHz and produces
a regulated 12V, 10A output from an input voltage range
of 9V to 36V: suitable for telecom, industrial, and other
applications. It has an eighth-brick footprint area. Synchro-
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage
OUT
I
Output Current Range, Continuous
OUT
f
Switching (Clock) Frequency
SW
V
Output Ripple
OUT(P-P)
I
Output Regulation
REG
P
/P
Efficiency (See Figure 3)
OUT
IN
Isolation
Approximate Size
Arrow.com.
Downloaded from
120W Isolated Forward Converter
chip set.
DEMO MANUAL DC1739B-C
with Synchronous Rectification
nous rectification helps to attain efficiency exceeding 94%.
Secondary-side control eliminates complex opto-coupler
feedback, providing fast transient response with minimum
output capacitance. For other output requirements, see the
LTC3766 data sheet or contact the LTC factory.
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.
Specifications are at T
= 25°C
A
CONDITIONS
200LFM
V
= 24V, I
= 10A (20MHz BW)
IN
OUT
Line and Load (9V
to 36V
, 0A
IN
IN
OUT
V
= 24V, I
= 10A
IN
OUT
Basic
Component Area × Top Component Height
LTC3765/LTC3766
MIN
TYP
9
12.0
0
240
40
to 10A
)
±0.27
OUT
92.7
1500
2.3 × 0.9 × 0.47
MAX
UNITS
36
V
V
10
A
kHz
mV
P–P
%
%
VDC
Inches
dc1739bcf
1

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Summary of Contents for Linear Technology DC1739B-C

  • Page 1 12V, 10A output from an input voltage range L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear of 9V to 36V: suitable for telecom, industrial, and other Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Operating Principles

    LTC3765 through T3. These pulses DC1739B-C. For bench testing, an electrolytic capacitor also provide primary bias power efficiently over a wide has been added at the input terminals to provide suitable input voltage range.
  • Page 3 DC1739B-C’s output current. 8. Once the proper output voltage is again established, b. A voltmeter with a capability of measuring at least 12V...
  • Page 4 DEMO MANUAL DC1739B-C QUICK START PROCEDURE Figure 3. Output Ripple at 24V and 10A (50mV, 5A, 2µs/Div, 20MHz) Figure 4. Transient Response Waveform at 24V and 5A – 7.5A – 5A (5A, 100mV, 100µs/Div) dc1739bcf Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from...
  • Page 5 DEMO MANUAL DC1739B-C QUICK START PROCEDURE Figure 5. Thermal Map, Front Side at 24V and 10A = 25°C, 200LFM) Figure 6. Thermal Map, Back Side at 24V and 10A = 25°C, 200LFM) dc1739bcf Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from...

  • Page 6: Parts List

    DEMO MANUAL DC1739B-C PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., AL., TH,100uF, 50V, ME-PX SERIES SUNCON, 50ME100PX C2, C3, C4, C5 CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12 CAP., C0G, 47pF, 200V, 5%, 1206 AVX, 12062A470JAT2A CAP., C0G, 15pF, 200V, 5%, 0805...
  • Page 7 DEMO MANUAL DC1739B-C PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER RES., CHIP, 0.750Ω, 1/3W, 1%, 0805 SUSUMU, RL1220S-R75-F RES., CHIP, 20.0k, 1/10W, 1%, 0603 VISHAY, CRCW060320K0FKEA RES., CHIP, 1.82k, 1/10W, 1%, 0603 VISHAY, CRCW06031K82FKEA RES., CHIP, 11.5k, 1/10W, 1%, 0603...

  • Page 8: Schematic Diagram

    DEMO MANUAL DC1739B-C SCHEMATIC DIAGRAM dc1739bcf Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 9 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 10 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.

This manual is also suitable for:

Ltc3765Ltc3766

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