DI-31 Ver la hoja de datos (PDF) - Power Integrations, Inc
Número de pieza
componentes Descripción
Fabricante
DI-31 Datasheet PDF : 2 Pages
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DI-31
• Minimize primary and secondary high current loop areas
to reduce parasitic inductance.
• Optocoupler U2 should have a controlled CTR range of
100 to 200% for optimum loop stability.
• Size transformer reset components to ensure transformer
reset at minimum operating voltage without exceeding
170 V drain voltage at high line. It may be necessary to gap
T1 to offset effect of Q4-Q6 gate capacitance.
• Set Zener VR1 clamp voltage to 150 V to both safely limit
the DRAIN below BVDSS and guarantee transformer reset.
• Select number of bias turns to provide 12 V to 14 V at
minimum input voltage and full load.
• Main primary power return should be connected to the
DPA-Switch tab, not to the SOURCE pin.
• Scale time constant of C9 and L2 to allow C9 to reset
completely during minimum on-time conditions.
• Consult AN-31 for additional design tips and information.
92
TRANSFORMER PARAMETERS
Core Material
Bobbin
Winding Details
EFD25, 3F3
Gap for ALG = 1100 nH/T2
EFD25 10 pin
(B&B B-025 or equivalent)
Bias: 5T, 30 AWG
Primary: 6T+ 5T, 4 x 26 AWG
Secondary: 3T, 0.005" Cu foil
Winding Order
(Pin Numbers)
Primary (3-2), tape, Bias (4-5), tape,
Secondary (6,7-9,10), tape,
Primary (2-1), tape
Inductance
Primary: 130 µH ±10%,
Leakge: 10 µH (max)
Primary Resonant
Frequency
3 MHz (minimum)
Table 1. Transformer Design Parameters.
90
88
86
84
VIN = 36 VDC
VIN = 48 VDC
82
VIN = 60 VDC
VIN = 72 VDC
80
0
20
40
60
80
Output Power (W)
Figure 2. Efficiency vs. Output Power.
OUTPUT INDUCTOR PARAMETERS
Core
Bobbin
EE22, TDK PC40 Material
Gap for ALG of 250 nH/T2
TDK BE-22-5116
Winding Details
Inductance
4T, 0.016" Cu foil
4 µH ± 10%
Table 2. Output Inductor Construction Information.
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Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability.
Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any
license under its patent rights or the rights of others. The products and applications illustrated herein 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, Inc.
PI Expert is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc.
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B
12/02
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