鈾?/div>
Synchronous-Rectifier Topology
Remote On/Off Control
Continuous Short Circuit Protection
High Efficiency
Non-Isolated
Current Share Function
NOTES:
1. Measure from high line to low line.
2. Measure from full load to 1/2 load.
3. Measured with 1uF ceramic cap. Connected to the
output pins.
4. Output Power
100%
SPECIFICATIONS
All specifications are typical at nominal line, full load and
25擄C unless otherwise noted.
INPUT SPECIFICATIONS
Input Voltage Range, 5V 鈥?鈥?鈥?鈥?鈥?..鈥?鈥?鈥?鈥?鈥?4.75-5.5V
12V 鈥?鈥?鈥?鈥?鈥?鈥?.鈥?鈥?鈥?鈥?10.4-13.6V
Input Filter 鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?..鈥?鈥?鈥?... Capacitive
Operating
Temperature
(擄C)
-25
50
100
OUTPUT SPECIFICATIONS
Voltage Accuracy .鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?.鈥?鹵 2 % max.
Transient Response(25% Step Load Change) 鈥?.. <500渭S
Line Regulation
1
鈥?..鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?.. 鹵0.5% max.
2
Load Regulation 鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?..鈥?. 鹵0.7% max.
Ripple and Noise, 20MHz BW
3
鈥?鈥?鈥?鈥?.鈥?75mV P-P max.
Temperature Coefficient 鈥?鈥?鈥?鈥?鈥?鈥?.鈥β?.02%/擄C max.
Short Circuit Protection .鈥?鈥?鈥?鈥?鈥?鈥?鈥?..鈥?鈥?Continuous
Automatic Recovery
Maximum case temperature must not be exceeded 100擄C.
5. UM3500 series can be used as parallel connection to
provide current share function. The current that each
converter delivers will thus be 1/N of the total current, if
there are N total converters in parallel. Limitations to this
scheme are dependent primarily on matching of the
resistances in the converter: mismatch in resistance
results in one converter delivering more current than
another. When using this current share function, Pin
1(SYNC) and Pin 3(PWM) must be connected to each
other or be floating if used as single unit.
REMOTE ON/OFF CONTROL
Logic Compatibility鈥?鈥?鈥?鈥?鈥?.CMOS or Open Collector TTL
Converter ON.鈥?鈥?鈥?鈥?.鈥?鈥?鈥?鈥?>+2.5 VDC or Open Circuit
Converter OFF鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?.<+0.8 VDC or Short Circuit
Control Common鈥?鈥?鈥?鈥?鈥?..鈥?鈥?.Referenced to Input Minus
GENERAL SPECIFICATIONS
Efficiency .鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?..鈥?.鈥?See Table
Switching Frequency 鈥?..鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?.. 200KHz typ.
4
Operating Temperature Range 鈥?.鈥?鈥?.鈥?-25擄C to +100擄C
Storage Temperature ....鈥?.鈥?鈥?鈥?鈥?鈥?鈥?鈥?-40擄C to+105擄C
Cooling 鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?..鈥?鈥?鈥?Free Air Convection
Dimensions 鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?.鈥?鈥?鈥?..鈥?2 x 1 x 0.4 inches
(50.8 x 25.4 x 10.2mm)
Case Material 鈥?鈥?鈥?..鈥?鈥?鈥?鈥?Black-Coated Copper with
Non-Conductive Base
UNIVERSAL
MICROELECTRONICS
UM3500
1 of 2
3,27TH RD., TAICHUNG INDUSTRIAL PARK,
TAICHUNG, TAIWAN, R.O.C.
TEL: 886-4-23590096 FAX: 886-4-23590129
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