US90A / US91A
24V Hall IC Fan Driver
6 General Electrical Specifications
DC Operating Parameters TA = 25oC, VDD = 24V (unless otherwise specified)
Parameter
Fan Supply Voltage
Supply Current
Output Saturation Voltage
Output Saturation Voltage
Output Clamp Voltage
FG / RD Output Low Voltage
FG / RD Output Clamp Voltage
Symbol Test Conditions
Min
4.7(1)
Typ
Max
30
4
Units
V
mA
mV
mV
V
mV
V
µA
VDD
IDD
Operating, RCOIL = 50Ω
2
375
625
VDSON 1,2 IOUT = 150mA
VDSON 1,2 IOUT = 250mA
VOUT 1,2
60
28
VOL
IOL = 10mA
250
500
10
VCLAMP
FG / RD Output Leakage Current ILEAK
VFG (VRD) = 18V
DC Thermal Resistance
VK Thermal Resistance
VA Thermal Resistance
Locked Rotor Period
Locked Rotor Period
Output Switching Delay
RTHja
RTHja
RTHja
TON
TOFF
TDELAY
One-sided PCB, zero LFPM
One-sided PCB, zero LFPM
One-sided PCB, zero LFPM
150
200
170
0.25
1.5
°C/Watt
°C/Watt
°C/Watt
S
S
us
“Dead time” when both drivers are off
200
Table 3: General electrical specifications
Note 1: The minimal value of VDD should be determined using the following equation: VDD = 4.5V + RCOIL * IDD
7 Magnetic Specifications
DC Operating Parameters TA = 25oC, VDD = 24V (unless otherwise specified)
Parameter
Operate point
Symbol
BOP
Test Conditions
Min
Typ
3
Max
6
Units
mT
Release point
Hysteresis
BRP
BHYST
-6
2
-3
6
mT
mT
Table 4: Magnetic specifications
8 Driver Output vs Magnetic Pole
Parameter
North pole
Test Conditions
B < Brp – all packages
OUT1
High
OUT2
Low
South pole
B > Bop - all packages
Low
High
Table 5: Driver output vs. magnetic pole
Note 3: The magnetic pole is applied facing the branded side of the package
390109026302
Rev 002
Page 4 of 12
Data Sheet
Apr/07
MELEXIS [ Melexis Microelectronic Systems ]
