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PDF US90A Data sheet ( Hoja de datos )
| Número de pieza | US90A | |
| Descripción | (US90A / US91A) 24V Hall IC Fan Driver | |
| Fabricantes | Melexis Microelectronic Systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de US90A (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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US90A / US91A
24V Hall IC Fan Driver
Features and Benefits
Low cost
High sensitivity Hall Sensor
Locked rotor protection and auto-restart
Power-efficient CMOS and power MOSFETs
Built-in output protection clamping diode
Integrated tachometer (US90A) or alarm (US91A) signal output
2-coil fan driver with FG/RD output in 4-pin VK / VA
and 8-pin narrow SOIC packages (all RoHS Compliant)
Application Examples
12V/24V fans
Peak current up to 500mA
Ordering Information
www.DataSheet4U.com
Part No.
US90A
US90A
US90A
Temperature Code
E (-40°C to 85°C)
E (-40°C to 85°C)
E (-40°C to 85°C)
US91A
US91A
US91A
E (-40°C to 85°C)
E (-40°C to 85°C)
E (-40°C to 85°C)
Package Code
VK (4-pin TO-92)
DC (8-pin narrow SOIC)
VA (4-pin TO-92 flat)
VK (4-pin TO-92)
DC (8-pin narrow SOIC)
VA (4-pin TO-92 flat)
1 Functional Diagram
2 General Description
The US90A/91A is a one-chip solution for driving
two-coil brushless DC cooling fans.
Based on the advanced Melexis CMOS process,
the IC contains a Hall-effect sensor, dynamic
offset correction and low side output drivers.
Frequency Generator or Rotation Detection is
available. The open-drain output makes the
connectivity with any external interface such as
hardware monitoring or Super I/O IC easier.
These features are combined with the Melexis
patented no-VDD design to fit the IC in small 4-pin
VK and VA package.
The device is also delivered in DC package for
automatic assembly.
390109026302
Rev 002
Page 1 of 12
Data Sheet
Apr/07
1 page  
US90A / US91A
24V Hall IC Fan Driver
9 Detailed General Description
The US90A/91A is a one-chip solution for driving two-coil brushless DC fans. Based on advanced Melexis
CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and low side output drivers.
The output drivers OUT1 and OUT2 are fully protected against switching transients. So there is no need for
an external zener diode to cut the high voltage spikes induced by the fan coils.
The US90A has an open-drain integrated tachometer FG output that follows the Hall signal.
In the US91A, the open-drain rotation detection output RD is active low during normal spinning of the motor.
It goes high when the flux switching frequency becomes too low, which means the motor is blocked.
www.Data1Sh0eeUt4Un.cioqmue Features
The absence of a VDD pin enables the two low side output drivers and FG/RD signal output to fit in a four-pin
VK package. The lack of a VDD pin decreases also the probability to damage the chip due to reverse voltage
connection, using the coil resistance to limit the reverse current. In this condition, the total reverse current is
twice the peak current value of the fan used.
The built-in locked-rotor protection will automatically shut off the coil current when the rotor is mechanically
blocked, or the rotational speed drops below 60 RPM (4-pole rotor magnet). The fan will try to restart every
1.5 seconds until the obstruction is clear. The On / Off cycling reduces the average stall current to 1/7 normal;
this is enough to prevent overheating or damage to most fans. Both the US90A and US91A have this feature.
390109026302
Rev 002
Page 5 of 12
Data Sheet
Apr/07
5 Page 
US90A / US91A
24V Hall IC Fan Driver
16.3 VA Package Information (4-pin TO92 flat)
1x45°(REF)
5.38+/-0.05
5.16+/-0.08
4.30+/-0.20
0.30+/-0.05
www.DataSheet04.4U0.com
0.60
1.10
1.20
0.24
0.29
5°
45°(TYP)
1 max
0.61
0.66
5°(2X)
Notes:
1. All dimensions are in millimeters
2. Package dimension exclude end flash
Marking:
Top Side:
1st Line : US90A (US91A) - Name of the device
2nd Line : xxxxxx - Assembly lot number (last 6 digits)
Bottom Side:
yyww : yy = year
ww = week
1.27+/-0.05
3.81+/-0.05
5°(2x)
0.40+/-0.05
45°(2x)
5°(2x)
2.69
0.25
+0.06
- 0.07
Hall plate location
0.33
Notes:
1. All dimensions are in millimeters
2. Typical values
390109026302
Rev 002
Page 11 of 12
Data Sheet
Apr/07
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet US90A.PDF ] | |
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