SA276 BRUSH-LESS DC-FAN DRIVER WITH ON-CHIP HALL SENSOR DESCRIPTION SA276 mainly designed for electronic commutation of brush-less DC fan. This IC internally includes the Hall Plate, Regulator, Pre-Amplifier, Comparator, and a pair of complementary open-collector Outputs (DO, 12 DOB). 34 SA276 internally includes power-reverse protecting diode, the TO - 94 protecting diode only protects chips but not for coils. If necessary, add one external diode to block the reverse current from coils. FEATURES * On-chip hall sensor ORDERING INFORMATION * Wide operating voltage: 3.5V to 20V * 400mA (avg) output sink current * Build-in power-reverse protecting diode only for reverse power connecting Device Package SA276 TO-94 APPLICATIONS * Dual coils brush-less DC fan * Dual coils brush-less DC motor * Revolution counting * Speed measurement BLOCK DIAGRAM VCC 1 REG Hall PRE AMP 2 DO 4 GND 3 DOB ABSOLUTE MAXIMUM RATINGS (Tamb=25°C) Characteristics Symbol Value Unit Supply Voltage VCC 25 V Reverse Vcc Polarity Voltage Vrcc -25 V B Unlimited G 400 mA 500 mA 700 mA Magnetic Flux Density Output Current On Continuous Hold Iomax Peak (start up) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV: 1.2 2008.09.27 Page 1 of 5 SA276 Characteristics Symbol Value Unit Tj 170 °C Storage Temperature Range Tstg -55~+150 °C Operating Temperature Range Tamb -25~+85 °C Package Power Dissipation(Tamb≤85°C) Ptot 500 mW Maximum Jointing Temp t≤10s Tsd 260 °C Maximum Junction Temp ELECTRICAL CHARACTERISTICS (Tamb=25°C, VCC=4.0V to 20V) Characteristics Symbol Test Condition Min. Typ. Unit 25 V 25 mA Vcc Supply Current Icc VCC=20V, RL 16 Low Supply Voltage Vce VCC=3.5V, IL=100mA 0.4 Vce(sat) VCC=12V, IL=300mA 0.3 0.5 V Icex VCE=12V, VCC=12V <0.1 10 µA Output Saturation Voltage Output Leakage Current 3.5 Max. Supply Voltage V Output Rise Time tr VCC=12V, RL=820Ω,CL=20pF 3.0 10 µs Output Falling Time tf VCC=12V, RL=820Ω,CL=20pF 0.4 2 µs Switch Time Differential ∆t VCC=14V, RL=820Ω,CL=20pF 3.0 10 µs Output Zener Breakdown Vz 40 V MAGNETIC CHARACTERISTICS Characteristics Symbol Test circuit Min. Typ. Max. 0 -- 50 0 -- 60 -- -- 80 SA276-D -- -- 90 SA276-A -50 -- 0 -60 -- 0 -80 -- -- SA276-D -90 -- -- SA276-A 0 -- 100 0 -- 120 -- -- 160 -- -- 180 SA276-A Operate Point Release Point Hysteresis SA276-B SA276-C SA276-B SA276-C SA276-B SA276-C Bop Brp Bhys Tamb=-20~+85°C Tamb=-20~+85°C Tamb=-20~+85°C SA276-D HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV: 1.2 Unit G G G 2008.09.27 Page 2 of 5 SA276 While the magnetic flux density B is larger than operate point Bop, DO will turn on and output low potential, DOB will turn off and output high potential. Each output is latched until the magnetic flux density B is lower than release point Brp, and then DO; DOB transfer each state. PIN CONFIGURATION 1 2 3 4 VCC DO DOB GND SA276 PIN DESCRIPTION Pin No. Symbol Description 1 VCC Power supply 2 DO Positive output 3 DOB Negative output 4 GND Ground. HALL SENSOR LOCATION Unit X 1.75 mm Y 1.35 mm TEST CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV: 1.2 2008.09.27 Page 3 of 5 SA276 TYPICAL APPLICATION CIRCUIT PACKAGE OUTLINE TO-94 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn UNIT: mm REV: 1.2 2008.09.27 Page 4 of 5