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Hall IC Fan Motor Driver
DESCRIPTION
SD1579 is a one-chip, two phase Hall IC fan driver use the advanced BICDMOS process.Power output stage using LDMOS transistors, with low Rdson, low power dissipation and capable of withstanding high output drive current. The driver of the motor circuit built-in Locked-rotor protection circuit, with automatic restart function. Built-in voltage regulator circuit for the Hall sensor and amplifier circuit to provide internal power supply; The dynamic compensation circuit capable of providing good consistency and very small magnetic shift of the window over the whole temperature range,. Built-in Zener output as the output protection management and in the supply-side built-in reverse protection diodes, which can effectively prevent damage when the power supply circuit is reverse.
TO - 94
APPLICATIONS
* Dual coils brush-less DC fan; * Dual coils brush-less DC motor.
FEATURES
* Built-in lock protection circuit; * Built-in Auto restart circuit; * Built-in Hall sensor with high stability of the dynamic compensation circuit; * Built-in Hall amplifier with hysteresis; * Built-in Zener Diodes protect outputs circuit; * Built-in Voltage Regulator circuit. * Built-in Reverse-voltage protection diode * Hall magnetic window, consistency and temperature stability; * Wide operating voltage range, small quiescent current; * Low Rdson, high drive current capability;
ORDERING INFORMATION
Part No. SD1579 Package TO-94 Marking 1579 Material Pb free Package Type Bulk
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
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BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Characteristics VCC Maximum Supply Voltage Maximum Output Current (Fault) Power Dissipation Operating Temperature Range Storage Temperature Range Maximum Junction Temperature Symbol VCC max Iout(AVE) Iout(PEAK) Pd Tamb Tstg Tj Ratings 30 500 700 550 -40 ~ 125 -55 ~ 150 150 Unit V mA mA mW C C C
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS (Unless specified particularly Tamb=25C, VCC=12V)
Characteristics Supply Voltage Supply Current Output Saturation voltage Output Saturation voltage Thermal Resistance Locked-Rotor Period Locked-Rotor Period Output Zener-breakdown Voltage Symbol VCC ICC VDSS VDSS Rth ton toff Vz 35 Test Conditions Operating Operating Iout=300 mA Iout=500 mA Operating Min. ~ ~ ~ ~ Typ. 12 2.0 210 350 227 0.5 3 42 60 Max. 28
*
Unit V mA mV mV C /W S S V
4.0 300 500
*Note: Please used in power dissipation limitation for all coil with different efficiency.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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MAGNETIC CHARACTERISTICS (Unless specified particularly Tamb=25C, VCC=12V, 1mT=10Gauss)
Characteristics Operate Point Release Point Hysteresis Symbol Bop BRP BHYS Test Conditions Operating Operating Operating Min. 10 -60 ~ Typ. 30 -30 60 Max. 60 -10 ~ Unit GS GS GS
When flux B is over operation point Bop, Do is on and output low voltage, DOB is off and output high voltage. Every output is locking until the flux B is less than release point Brp, then DO and DOB switch the states.
PIN CONFIGURATION
PIN DESCRIPTION
Pin No. 1 2 3 4 Pin Name VDD DO DOB GND I/O -O O -Power supply Driver Output pin Driver Output pin Ground Description
HALL SENSOR LOCATION
Value X Y 2.3 1.09
Unit mm mm
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:1.0
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FUNCTION DESCRIPTION
This IC detects the rotation of the motor by hall signal, and adjusts lock detection ON time (TON) =0.5S and lock detection OFF time (TOFF)=3.0S by internal counter. The time (TNO, TOFF) sequence is shown below.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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TEST CIRCUIT
TYPICAL APPLICATION CIRCUIT
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APPLICATION INFORMATION
1. Back electromotive force causes regenerated current to VDD line, therefore take a measure such as placing a capacitor between power supply and GND for routing regenerated current; In order to reduce the output DO and DOB side effects of induced electromotive force, need to increase a resistance-capacitance network at the output; in a typical application circuit diagram, R1 and R2 is typically 56 ohms; C1, C2 and C3 is typically 2.2uF; The value of R and C must match the actual coil; 2. Figure 2 is the normal working state, the current compose ICC and Iload , power dissipation PC = VDD * ICC + Vo * Iload , Where Vo is the output voltage when DO or DOB turn on; It is need to be careful not to exceed its maximum power dissipation value dule to change of power supply voltage VDD and the coil current Iload. 3. SD1579 has built-in reverse protection diodes, so D1 is no need; If you increase the D1 can better protect the chips, as shown in Figure 3; it should be noted that care should to taken to the two coils current when power voltage reversed, if 2*Vo * Iload > IC's power consumption, it may cause damage to IC;
Fig.2 Normal working state 4.
Fig.3 Reverse voltage state
Add a diode to coils can better protect the chip and the fans at reverse voltage state, as shown in Figure 4;
Figure 4 Add a diode to coils
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2009.11.11 Page 6 of 7
PACKAGE OUTLINE
TO-94 UNIT: mm
MOS DEVICES OPERATE NOTES:
Electrostatic charges may exist in many things. Please take following preventive measures to prevent effectively the MOS electric circuit as a result of the damage which is caused by discharge: l l l l The operator must put on wrist strap which should be earthed to against electrostatic. Equipment cases should be earthed. All tools used during assembly, including soldering tools and solder baths, must be earthed. MOS devices should be packed in antistatic/conductive containers for transportation.
Disclaimer: * Silan reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! Customers should obtain the latest relevant information before placing orders and should verify that such information is complete and current. * All semiconductor products malfunction or fail with some probability under special conditions. When using Silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such Silan products could cause loss of body injury or damage to property. * Silan will supply the best possible product for customers!
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2009.11.11 Page 7 of 7

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