DC Brushless Fan Motor Drivers Three-Phase Full-Wave Fan ...

1 Product structure Silicon monolithic integrated circuit This product is not designed protection against radioactive rays 1/22 TSZ02201-0H1H0B100530-1-2 2013 ROHM Co., Ltd. All rights reserved. 11. Dec. 2014 14 001 DC Brushless Fan Motor Drivers Three-Phase Full-Wave Fan Motor Driver BD6326 NUX General description BD6326 NUX is a Three-Phase sensorless fan Motor driver used to cool off notebook PCs. It is controlled by a variable speed provided through the PWM input signal. Its feature is sensorless drive which doesn t require a hall device as a location detection sensor and Motor downsizing can be achieved by limiting the number of external components as much as possible. Furthermore, introducing a direct PWM soft switched driving mechanism achieves silent operations and low vibrations.

2 Features Speed controllable by PWM input signal 180 Sinusoidal drive Power save function Internal RNF resistance Motor rotation direction select function(FR) Package W(Typ) x D(Typ) x H(Max) VSON010X3030 x x Application Small fan Motor notebook PCs etc. Absolute maximum ratings Parameter Symbol Limit Unit Supply voltage VCC 7 V Power dissipation (NOTE 1) Pd W Operating temperature Topr 25 to +95 C Storage temperature Tstg 55 to +150 C Output voltage Vomax 7 V Output current(NOTE 2) Iomax 700 mA FG signal output voltage VFG 7 V FG signal output current IFG 6 mA Junction temperature Tjmax 150 C (NOTE 1)

3 Reduce by C over Ta=25 C. (On glass epoxy board) (NOTE 2) This value is not to exceed Pd. Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings. Recommended operating condition Parameter Symbol Limit Unit Operating supply voltage range VCC to V Input voltage range(PWM, FR terminals) VINx 0 to VCC V VSON010X3030 2/22 DatasheetDatasheetBD6326 NUX TSZ02201-0H1H0B100530-1-2 2013 ROHM Co.

4 , Ltd. All rights reserved. 11. Dec. 2014 TSZ22111 15 001 Pin Configuration Pin Description Block Diagram P/No. T/nameFunction 1 FG FG output terminal 2 COM Coil midpoint terminal 3 VCC Power supply terminal 4 U U phase output terminal 5 FR Motor rotation direction select terminal 6 W W phase output terminal 7 V V phase output terminal 8 GND GND terminal 9 TOSCS tart-up oscillation terminal 10 PWM PWM signal input terminal Figure 2. Block diagram Figure 1. Pin configuration (TOP VIEW) FG COM VCC U FR PWM TOSC GND V W 3/22 DatasheetDatasheetBD6326 NUX TSZ02201-0H1H0B100530-1-2 2013 ROHM Co., Ltd. All rights reserved. 11. Dec. 2014 TSZ22111 15 001 Electrical characteristics (Unless otherwise specified Ta=25 C, VCC=5V)

5 Parameter Symbol Limit Unit Conditions Min TypMax<OVERALL> Circuit current STB ICST - 20 50 A Circuit current ICC mA <PWM terminal> PWM input H level VPH - VCCV PWM input L level VPL 0 - V PWM input current H IPH - 0 1 A PWM=VCC PWM input current L IPL -50 -20- A PWM=GND Input frequency fP 20 - 50 kHz <FR terminal> FR input H level VOH - VCCV FR=H : Normal rotation FR input L level VOL 0 - V FR=L; Reverse rotation <TOSC terminal> TOSC frequency fOSF 28 40 52 kHz TOSC-GND 2200pF TOSC charge current IOCC A TOSC= TOSC discharge current IODC 75 100125 A TOSC= <FG terminal> FG low voltage VFGL - - V IFG 5mA <Output terminals> Output voltage VO - Io 250mA ( total) PWM off time tPO 1 2 ms Lock protection det.

6 Time tLDT s Lock protection rel. time tLRT s About a current item, define the inflow current to IC as a positive notation, and the outflow current from IC as a negative notation. 4/22 DatasheetDatasheetBD6326 NUX TSZ02201-0H1H0B100530-1-2 2013 ROHM Co., Ltd. All rights reserved. 11. Dec. 2014 TSZ22111 15 001 01234567801 2345 67 Supply voltage: VCC [V]Circuit current: ICC [mA]010203040506001234567 Supply voltage: VCC [V]Circuit current STB: ICST [ A]010203040506001234567 Supply voltage: VCC [V]TOSC frequency: fOSF [kHz]-60-50-40-30-20-1001001234567 Supply voltage: VCC [V]PWM input current: Ipx [ A]Typical Performance Curves 1 (Reference data) Figure 4.

7 Circuit current 95 C25 C 25 CFigure 3. Circuit current STB 95 C25 C 25 CFigure 6. TOSC frequency 95 C25 C 25 CFigure 5. PWM input current 95 C25 C 25 COperating range Operating rangeOperating range Operating range95 C25 C 25 C 5/22 DatasheetDatasheetBD6326 NUX TSZ02201-0H1H0B100530-1-2 2013 ROHM Co., Ltd. All rights reserved. 11. Dec. 2014 TSZ22111 15 001 025507510012515001234567 Supply voltage: VCC [V]TOSC discharge current: IODC [ A]-150-125-100-75-50-25001234567 Supply voltage: VCC [V]TOSC charge current: IOCC [ A] sink current: IO [m A]FG low voltage: VFGL [V] s ink current: IO [m A]FG low voltage: VFGL [V]Typical Performance Curves 2 (Reference data) Figure 8. TOSC discharge current 95 C25 C 25 CFigure 7. TOSC charge current 95 C25 C 25 CFigure 10.

8 FG low voltage (Temp=25 C) 9. FG low voltage (VCC=5V) 95 C25 C 25 COperating range Operating range 6/22 DatasheetDatasheetBD6326 NUX TSZ02201-0H1H0B100530-1-2 2013 ROHM Co., Ltd. All rights reserved. 11. Dec. 2014 TSZ22111 15 001 s ource current: IO [A]Output high side voltage: VOH [V] sink current: IO [m A]Output low side voltage: VOL [V] source current: IO [A]Output high side voltage: VOH [V] sink current: IO [m A]Output low side voltage: VOL [V]Typical Performance Curves 3 (Reference data) Figure 12. Output high side voltage(Temp=25 C) 11. Output high side voltage (VCC=5V) 95 C25 C 25 CFigure 14. Output low side voltage (Temp=25 C) 13. Output low side voltage (VCC=5V) 95 C25 C 25 C 7/22 DatasheetDatasheetBD6326 NUX TSZ02201-0H1H0B100530-1-2 2013 ROHM Co.

9 , Ltd. All rights reserved. 11. Dec. 2014 TSZ22111 15 001 voltage: VCC [V]Lock protection : tLD T [s] voltage: VCC [V]PWM off time: tPO [ms]024681001234567 Supply voltage: VCC [V]Lock protection : tLR T [s]Typical Performance Curves 4 (Reference data) Figure 16. Lock protection 95 C25 C 25 CFigure 15. PWM off time 95 C25 C 25 CFigure 17. Lock protection 95 C25 C 25 COperating range Operating rangeOperating range 8/22 DatasheetDatasheetBD6326 NUX TSZ02201-0H1H0B100530-1-2 2013 ROHM Co., Ltd. All rights reserved. 11. Dec. 2014 TSZ22111 15 001 Timing chart 1) Sensorless Drive BD6326 NUX is a Motor driver IC for driving a Three-Phase Brushless DC Motor without a hall sensor. Detecting a rotor location firstly at startup, an appropriate logic for the rotation direction is obtained using this information and given to each phase to rotate the Motor .

10 Then, the rotation of the Motor induces electromotive voltage in each phase wiring and the logic based on the induced electromotive voltage is applied to the each phase to continue rotating. BEMF detection driving mechanism (synchronized start-up mechanism) BD6326 NUX s start mechanism is synchronized start-up mechanism. BD6326 NUX as BEMF detection driving starts by set output logic and monitors BEMF voltage of Motor . Driving mechanism changes to BEMF detection driving after detect BEMF signal. When BEMF signal isn t detected for constant time at start-up, synchronized start-up mechanism outputs output logic forcibly by using standard synchronized signal (sync signal) and makes Motor forward drive. This assistance of Motor start-up as constant cycle is synchronized driving mechanism. Synchronized frequency is standard synchronized signal.