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DI-24 Datasheet(PDF) 2 Page - Power Integrations, Inc.

Part No. DI-24
Description  30 W DC-DC Converter
Download  2 Pages
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Maker  POWERINT [Power Integrations, Inc.]
Homepage  http://www.powerint.com
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DI-24 Datasheet(HTML) 2 Page - Power Integrations, Inc.

   
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www.powerint.com
A
9/02
DI-24
For the latest updates, visit our Web site: www.powerint.com
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 and EcoSmart are registered trademarks of Power Integrations, Inc.
PI Expert is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc.
WORLD HEADQUARTERS
AMERICAS
Power Integrations, Inc.
San Jose, CA 95138 USA
Customer Service:
Phone:
+1 408-414-9665
Fax:
+1 408-414-9765
e-mail: usasales@powerint.com
CHINA
Power Integrations International
Holdings, Inc.
China
Phone:
+86-755-8367-5143
Fax:
+86-755-8377-9610
e-mail: chinasales@powerint.com
SINGAPORE
Power Integrations, Singapore
Republic of Singapore 308900
Phone:
+65-6358-2160
Fax:
+65-6358-2015
e-mail: singaporesales@powerint.com
JAPAN
Power Integrations, K.K.
Keihin-Tatemono 1st Bldg.
Japan
Phone:
+81-45-471-1021
Fax:
+81-45-471-3717
e-mail: japansales@powerint.com
EUROPE & AFRICA
Power Integrations (Europe) Ltd.
United Kingdom
Phone:
+44-1344-462-300
Fax:
+44-1344-311-732
e-mail: eurosales@powerint.com
KOREA
Power Integrations
International Holdings, Inc.
Seoul, Korea
Phone:
+82-2-782-2840
Fax:
+82-2-782-4427
e-mail: koreasales@powerint.com
TAIWAN
Power Integrations
International Holdings, Inc.
Taipei, Taiwan
Phone:
+886-2-2727-1221
Fax:
+886-2-2727-1223
e-mail: taiwansales@powerint.com
INDIA (Technical Support)
Innovatech
Bangalore, India
Phone:
+91-80-226-6023
Fax:
+91-80-228-9727
e-mail: indiasales@powerint.com
APPLICATIONS HOTLINE
APPLICATIONS FAX
World Wide +1-408-414-9660
World Wide +1-408-414-9760
Core
Bobbin
Winding Details
Winding Order
(pin numbers)
Inductance
Primary Resonant
Frequency
TRANSFORMER PARAMETERS
Table 1. Transformer Construction Information.
PR1408
Siemens N87 material, ungapped
P1408 8 pin (B&B B-096 or equivalent)
Primary: 7T + 8T, 27 AWG
Secondary: 4T x 27 AWG
Primary (4-3), tape, Secondary
(5,6-7,8), Tape, Primary (3-1),tape
Primary: 450 µH ± 25%, Leakage 1 µH (max)
3.8 MHz (minimum)
Table 2. Output Inductor Construction Information.
Core
Bobbin
Winding Details
Winding Order
(pin numbers)
Inductance
Pins 5,6-7,8
OUTPUT INDUCTOR PARAMETERS
PR1408 Siemens N87 material
Gap for A
L of 163 nH/T
2
P1408 8 pin (B&B B-096 or equivalent)
Bias: 18T, 32 AWG, Main: 7T, 2x24 AWG
Bias (1-2), tape, Main winding (7,8-5,6), tape
8 µH ± 10%
90
80
75
85
0
10
20
30
40
Output Power (W)
60
65
70
VIN = 36 V
VIN = 48 V
VIN = 60 V
VIN = 72 V
Figure 2. Efficiency vs. Output Power.
Key Design Points
• For nominal under-voltage set point V
UV:
R1 = (V
UV-2.35 V)/50 µA. VOV = (R1×135 µA)+2.5 V.
• Select C9 such that the core resets at V
UV and the DRAIN
voltage
≤170 V at V
OV. To reduce leakage spike, C8 may
be added, adjusting C9 accordingly.
• Zener VR1 safely limits the DRAIN voltage below BV
DSS
and guarantees transformer reset.
• Opto U2 should have a CTR of between 100% and 200%
for optimum loop stability.
• At zero load, maximum input voltage, the bias voltage
across C4 should be
≥8 V (12 V to 15 V under nominal
conditions).
• Good layout practices should be followed:
- Locate C5, C6 and R4 close to U1, with grounds returned
to the SOURCE pin.
- Primary return should be connected to the DPA-Switch
tab, not the SOURCE pin.
-Minimize the primary and secondary loop areas to reduce
parasitic leakage inductance.
• Consult AN-31 and EPR-21 for additional design tips and
information.


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