US72 Ver la hoja de datos (PDF) - Melexis Microelectronic Systems
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US72 Datasheet PDF : 9 Pages
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US72/73
Single Coil Fan Driver
1. Glossary of Terms
Full Bridge: Two output drivers that can both source or sink current. When a load is placed between the
drivers, current can flow through the load in both directions.
FG: The Frequency Generator or tachometer signal; provides one pulse for every magnetic pole
RD: The Rotation detection or Lock Alarm signal is high when the rotor is blocked or spinning very slowly.
MilliTesla (mT), Gauss: Units of magnetic flux density; 1 milliTesla = 10 Gauss
Single Coil Fan: a fan with only one coil winding, usually requiring a bipolar or full-bridge driver
Locked rotor: The condition of a fan that has stopped spinning due to mechanical blockage
2. Absolute Maximum Ratings
Supply Voltage, VDD (overvoltage)
28V
Output Voltage, FG or RD
28V
Output Current, IOUT
Operating Temperature Range, TA
Junction Temperature, Tj
Storage Temperature, Ts
ESD Sensitivity (AEC Q100 002)
Magnetic Flux Density
500mA
-40 to 85°C
125°C
-55 to 150°C
2KV
No limit
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability.
3. US72/73 Electrical Specifications
DC Operating Parameters TA = 25oC, VDD = 12V (unless otherwise specified)
Parameter
Symbol Test Conditions
Min Typ Max Units
Supply Voltage
VDD
Operating
4.5
28 Volts
Supply Current
IDD
VDD = 24V, No Load
46
mA
On Resistance
Rdson Full bridge, Rnmos + Rpmos
3 5.3 Ohms
Bridge Current
Iload
Peak
500 mA
Bridge Current
Iload
Continuous
350 mA
Thermal Resistance
Rth one-sided PCB, zero LFPM
150
oC/Watt
Locked-Rotor Period
ton
0.25
S
Locked-Rotor period
toff
1.25
S
Freewheel Switching delay tfw
200
uS
FG/RD Output Leakage
Ioff
Vout = 24V
10
uA
FG/RD On voltage
Vdson
Iout = 5mA
0.5 Volts
3901090261
Rev. 002
Page 3 of 9
Data Sheet
May/04
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