Preliminary P708A (6/12)1pulseelectronics.com
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
USA 858 674 8100 Germany 49 7032 7806 0 Singapore 65 6287 8998 Shanghai 86 21 62787060 China 86 755 33966678 Taiwan 886 3 4356768
Electrical Specifications @ 25°C - Operating Temperature -40°C to +125°C
Part
Number
Inductance
(1-3)
(µH ±45%)
DCR (1-3)
(Ω MAX)
MAX (1-3)
(V-µsec)
Turns
Ratio
Isolated Voltage
(Vrms)
PH9185.011NL 750.0 0.50 66.0 1:1
4000.0
PH9185.012NL 450.0 0.40 52.0 1:2
PH9185.013NL 200.0 0.35 36.0 1:3
PH9185.021NL 880.0 0.56 74.0 2:1
PH9185.034NL 750.0 0.50 66.0 3:4
PH9185.038NL 310.0 0.35 44.0 3:8
PH9185.043NL 1260.0 0.70 89.0 4:3
PH9185.083NL 560.0 0.45 59.0 8:3
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” sux to the part number
(i.e. PH9185.012NL becomes PH9185.012NLT). Pulse complies to industry standard tape
and reel specification EIA481.
3. The “NL” sux 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.
PH9185.XXXXNL
Mechanical Schematic
1
4
2, 3
Weight .............................2.6grams
Tape & Reel ........................150/reel
Tray ......................................80/tray
Dimensions:
Unless otherwise specified,
all tolerances are ±
Inches
mm
.010
0,25
2pulseelectronics.com
Switching Mode Transformers
EP7 Platform SMD
Preliminary P708.A (6/12)
For More Information
Pulse Worldwide
Headquarters
12220 World Trade Drive
San Diego, CA
92128
U.S.A.
Tel: 858 674 8100
Fax: 858 674 8262
Pulse Europe
Einsteinstrasse 1
D-71083 Herren-
berg
Germany
Tel: 49 7032 78060
Fax: 49 7032 7806 135
Pulse China Headquarters
B402, Shenzhen Academy of
Aerospace Technol-
ogy Bldg.
10th Kejinan Road
High-Tech Zone
Nanshan District
Shenzen, PR China
518057
Tel: 86 755 33966678
Fax: 86 755 33966700
Pulse North China
Room 2704/2705
Super Ocean Finance
Ctr.
2067 Yan An Road
West
Shanghai 200336
China
Tel: 86 21 62787060
Fax: 86 2162786973
Pulse South Asia
135 Joo Seng Road
#03-02
PM Industrial Bldg.
Singapore 368363
Tel: 65 6287 8998
Fax: 65 6287 8998
Pulse North Asia
3F, No. 198
Zhongyuan Road
Zhongli City
Taoyuan County 320
Taiwan R. O. C.
Tel: 886 3 4356768
Fax: 886 3 4356823 (Pulse)
Fax: 886 3 4356820 (FRE)
Performance warranty of products oered 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.
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.
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
insulation for a working voltage up to 400V 8mm creepage and 4000Vrms isolation voltage is guaranteed to meet
this requirement. The design also complies with the Pulse’s class F insulation system.
MAXIM is a registered trademark of Maxim Integrated Products.
nd
nd
V
V
PH9185
D2
D1
GND
CC
OUT
VIN
DRIVER
IC
