DI-37 데이터 시트보기 (PDF) - Power Integrations, Inc
부품명
상세내역
제조사
DI-37 Datasheet PDF : 2 Pages
| |||
DI-37
Key Design Points
• Transformer core reset is critical in this design. MOSFET
gate loading will affect the transformer reset waveform.
Capacitor CQ1gs will load transformer reset. Choose Q1
MOSFET such that CQ1gs provides sufficient reset at low
line and safe maximum drain voltage at high line.
• Choose synchronous rectifier MOSFETs which have both
low RDS(ON) and also low Qg (combination of gate charge
Qgs and Miller capacitance Qgd).
• Reduce transformer leakage inductance by filling each
winding layer across the entire width of the bobbin.
• Choose a low-drop Schottky diode (such as Vishay
SL44 – Vf = 0.42 V), to increase high line efficiency.
• Choose a larger DPA-Switch to increase efficiency at low
and medium input voltages.
TRANSFORMER PARAMETERS
Core Material
Epcos P/N: P 14 x 8 N87,
ungapped
Bobbin
8-pin P 14 x 8 surface mount
bobbin
Winding Details
Primary 10T + 10T, 1 x 26 AWG
3.3 V, 4 x 26 AWG
Winding Order Primary-1 (4-NC), 3.3 V (5-6),
and Pin Numbers Primary-2 (NC-1)
Primary
Inductance
600 µH ±25% at 400 kHz
Primary Resonant
Frequency
3.8 MHz (minimum)
Leakage
Inductance
1 µH (maximum)
Table 1. Transformer Design Parameters.
INDUCTOR PARAMETERS
Core Material
Epcos P/N: P 14 x 8 N87,
gap for inductor
Bobbin
8-pin P 14 x 8 surface mount
bobbin
Winding Details
Main 10T, 2 x 24 AWG
Bias 30T, 1 x 32 AWG
Winding Order Main (7,8-5,6)
and Pin Numbers Bias (1-2)
Inductance
Pin (7,8-5,6): 16 µH ±10% at
400 kHz
Table 2. Inductor Design Parameters.
For the latest updates, visit www.powerint.com
Power Integrations may make changes to its products at any time. Power Integrations has no liability arising from your use of any information, device or circuit
described herein nor does it convey any license under its patent rights or the rights of others. POWER INTEGRATIONS MAKES NO WARRANTIES HEREIN AND
SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATIONS, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS. The products and applications illustrated herein (including circuits external to the
products and transformer construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications
assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com.
The PI logo, TOPSwitch, TinySwitch, LinkSwitch and EcoSmart are registered trademarks of Power Integrations. PI Expert and DPA-Switch
are trademarks of Power Integrations. Copyright 2004, Power Integrations
Power Integrations
5245 Hellyer Avenue
MAIN PHONE NUMBER
+1 408-414-9200
APPLICATIONS HOTLINE
+1 408-414-9660
APPLICATIONS FAX
+1 408-414-9760
B
7/04
www.powerint.com
San Jose, California 95138
For a complete listing of worldwide sales offices,
please visit www.powerint.com
Share Link: 