Switch Mode Transformers
EP7 Platform SMD
Push Pull Converter Transformer
Reinforced insulation for isolated power supply driver
Compatible with MAXIM™ MAX253 to power RS-485/RS232
transceiver
8mm creepage, 4000V Hi-pot
UL and TUV certification
UL class F insulation System compliant
Electrical Specifications @ 25°C - Operating Temperature -40°C to +125°C
Part
Number
2, 3
4
Inductance
(1-3)
(µH
±45%)
750.0
450.0
200.0
880.0
750.0
310.0
1260.0
560.0
DCR (1-3)
(Ω MAX)
0.50
0.40
0.35
0.56
0.50
0.35
0.70
0.45
MAX (1-3)
1
(V-µsec)
66.0
52.0
36.0
74.0
66.0
44.0
89.0
59.0
Turns
Ratio
1:1
1:2
1:3
2:1
3:4
3:8
4:3
8:3
Isolated Voltage
(Vrms)
PH9185.011NL
PH9185.012NL
PH9185.013NL
PH9185.021NL
PH9185.034NL
PH9185.038NL
PH9185.043NL
PH9185.083NL
4000.0
Notes:
1. The maximum volt-usec rating limits the peak flux density to 3600 gauss when used in
bi-polar drive application with 200KHz. For unipolar drive applications or a bi-polar drive
with 350kHz, a maximum volt-usec could be 60% of the listed value.
2. Optional Tape & Reel packing can be ordered by adding a “T” suffix to the part number
(i.e. PH9185.012NL becomes PH9185.012NLT). Pulse complies to industry standard tape
and reel specification EIA481.
3. The “NL” suffix indicates an RoHS-compliant part number.
4. The temperature of the component (ambient plus the temperature rise) must be
within the stated operating temperature range.
Mechanical
PH9185.XXXXNL
Schematic
Weight
.............................2.6grams
Tape & Reel
........................150/reel
Tray
......................................80/tray
Dimensions:
Inches
mm
Unless otherwise specified,
all tolerances are
±
.010
0,25
USA 858 674 8100
1
Germany 49 7032 7806 0
Singapore 65 6287 8998
Shanghai 86 21 62787060
China 86 755 33966678
Taiwan 886 3 4356768
pulseelectronics.com
Preliminary P708A (6/12)
Switching Mode Transformers
EP7 Platform SMD
Application
PH9185NL is a series of high isolation power supply transformer drivers. Intended to operate in a fixed
duty cycle Push Pull topology, it is a part of a low cost solution for delivering lower power (up to 3W) from a low
voltage source. A typical implementation would be an isolated RS-485/RS-232 power supply driver circuit, the
design is compatible with the MAXIM™ MAX253 IC.
A schematic diagram for the Push Pull converter topology is given below.
V
IN
V
CC
D1
PH9185
V
OUT
DRIVER
IC
D2
GND
For a fixed 50% duty cycle mode of operation, the output voltage is simply determined by the input
voltage and turns ratio. So, with the available turns ratios, a variety of output voltages can be selected.
This transformer design has been certified by UL to comply with U L60050-1 2 edition, and CAN/
CSA C22.2 NO. 60950-1-07 2 edition; and by TUV to comply with EN61558-1 and EN61558-2-16 with reinforced
nd
insulation for a working voltage up to 400V 8mm creepage and 4000Vrms isolation voltage is guaranteed to meet
this requirement. The design
nd
also complies with the Pulse’s class F insulation system.
MAXIM is a registered trademark of Maxim Integrated Products.
For More Information
Pulse China Headquarters
Pulse North China
Pulse South Asia
Pulse North Asia
B402, Shenzhen Academy of
Room 2704/2705
135 Joo Seng Road
3F, No. 198
Aerospace Technol-
Super Ocean Finance
#03-02
Zhongyuan Road
ogy Bldg.
Ctr.
PM Industrial Bldg.
Zhongli City
10th Kejinan Road
2067 Yan An Road
Singapore 368363
Taoyuan County 320
High-Tech Zone
West
Taiwan R. O. C.
Nanshan District
Shanghai 200336
Tel: 886 3 4356768
Shenzen, PR China
China
Tel: 65 6287 8998
Fax: 886 3 4356823 (Pulse)
Tel: 858 674 8100
Tel: 49 7032 78060
518057
Fax: 65 6287 8998
Fax: 886 3 4356820 (FRE)
Fax: 858 674 8262
Fax: 49 7032 7806 135
Tel: 86 755 33966678
Tel: 86 21 62787060
Fax: 86 755 33966700
Fax: 86 2162786973
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product names mentioned herein may be
trademarks or registered trademarks of their respective owners. © Copyright, 2011. Pulse Electronics, Inc. All rights reserved.
Pulse Worldwide
Headquarters
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San Diego, CA
92128
U.S.A.
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Einsteinstrasse 1
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berg
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pulseelectronics.com
Preliminary P708.A (6/12)
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