YF SERIES
UP TO 20 WATTS - YF SERIES
ULTRA-WIDE INPUT, LOW QUIESCENT CURRENT
TO 20 WATTS
FEATURES
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Single, Dual and Triple Outputs
Industry Standard Package and Pin-Out
Pi Input Filter Integral to Converter
1600VDC I/O Isolation
Regulated Output
Continuous short circuit protection
Remote On/Off Feature
UL1950, cUL950, EN60950 and CE MARK
THE YF SERIES FROM WALL INDUSTRIES
The YF series of DC/DC converters performs over an ultra-wide input voltage range (2:1 & 4:1), providing indefinite short
circuit and overvoltage protection. The series’ design technology allows up to 20 watts of output power from a 1.60” x
2.0” x 0.40” case. These current mode control forward converters are designed for improved transient response and
reduced stress on switching components and do not require external input filtering,making it a preferred source over
industry alternatives.
SPECIFICATIONS: YF SERIES
INPUT SPECIFICATIONS
Input Voltages...9-18,18-36,36-75,9-36,20-75,18-75VDC
Nominal Input.............................................12,24, 48VDC
Remote On/Off Control..........CMOS or TTL (see note 7)
Input Filter......................................................Pi input filter
All specifications apply @ +25 C ambient unless otherwise noted.
GENERAL SPECIFICATIONS
Efficiency.........................................................83% typical
Isolation Voltage (input to output)...............1600VDC min.
Isolation Resistance (input to output)................109Ohms
Switching Frequency.................................300kHz typical
MTBF......................................MIL217F 5.591x105 hours
OUTPUT SPECIFICATIONS
Output Current...................................................see table
Output Voltage Tolerance..........................................±2%
(auxillary triple outputs).........................................±5%
Output Trim (external)..............................................±10%
Line Regulation: full line (single and dual)..............±0.5%
(triple).............................................. main 1%, aux. 5%
Line Regulation: 20 Watt 4:1
Input...........................................................................±1%
Load Regulation
Singles (25-100% load)....................................±0.5%
(NL-100% load)...................................................±1%
Duals (50-100% load).........................................±1%
(NL-100% load)...................................................±5%
Short Circuit Protection...................................continuous
Ripple/Noise (20MHz BW) single......................75mV p-p
(dual)..............................................................100mV p-p
(triple) 5V/3.3V=50mV, ±12V=120mV, ±15V=150mV p-p
Transient Response..........<500µsec to within ±1% Vout
ENVIRONMENTAL SPECIFICATIONS
Operating Temperature (case).........................see
note 9
Storage Temperature..................................-55 to +105°C
Humidity (non-condensing).........................20 - 95% R.H.
PHYSICAL SPECIFICATIONS
Weight........................................................approx. 4.0 oz.
Dimensions..............................................1.6 x 2.0 x 0.40”
Case Material..................................Nickel coated copper,
.................................................non-conductive baseplate
Shielding............................................................Six-Sided
Due to advances in technology, specifications subject to
change without notice.
1/25/04
1
603 778 2300
WWW
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WALLINDUSTRIES
.
COM
YF SERIES
TO 20 WATTS
NOTES:
1. All case and pin to case dimensions reference only unless oth-
erwise noted.
2. All DC/DC converters should be externally fused on the front
end for protection.
3. P.C. pins - 0.04” dia. x 0.18” long (min); typical seven places
4. Pin to pin tolerance ± 0.01”. Pin diameter tolerance ± 0.005”
5. Duals: 1/4 load to full load: (1% and no load to full load: ±5%.
6. Significant capacitive load on output may inhibit start-up and
operation, consult factory.
7. On-control: 5.5V min. or Open. Off-Control: 0.4V max. or short.
Control voltage referenced to -VIn.
8. Input pi-filter without external capacitor filter.
9. Standard operating temperature ambient -25°C to +70°C
Suffix “I” -40°C to +70°C, maximum case temperature 100°C.
1/25/04
3
603 778 2300
WWW
.
WALLINDUSTRIES
.
COM
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