lb11850va Sanyo Semiconductor Corporation, lb11850va Datasheet
lb11850va
Available stocks
Related parts for lb11850va
lb11850va Summary of contents
Page 1
... LB11850VA Overview The LB11850VA is a single-phase bipolar fan motor driver with speed control function that works with a speed feedback signal. A highly efficient, quiet and low power consumption motor driver circuit, with a high speed accuracy and large variable speed can be implemented by adding a small number of external components. ...
Page 2
... CT pin H level voltage CT pin L level voltage CT pin charge current CT pin discharge current CT pin charge/discharge current ratio OUTN pin output H voltage OUTN pin output L voltage OUTP pin output L voltage LB11850VA Symbol Conditions V CC max I OUT N max I OUT P max V OUT max HB CTL, C max ...
Page 3
... CVO pin output H level voltage Output L level voltage Package Dimensions unit : mm (typ) 3287 6 0.5 0.22 0.15 (0.5) SANYO : SSOP24(225mil) LB11850VA Symbol Conditions difference voltage VHN (including offset and hysteresis) VFGL IFG = 5mA IFGL VFG = 19V VRDL IRD = 5mA IRDL VRD = 19V VEOH IEO1 = -0 ...
Page 4
... Speed control CPWM LB11850VA LB11850VA OUT1P OUT1N OUT2P OUT2N L L OFF OFF H L OFF L OFF OFF H OFF IN + OUT1P ...
Page 5
... Block Diagram LB11850VA ILB01797 No.A0609-5/14 ...
Page 6
... Sample Application Circuit *3 CTLsignal LB11850VA 1µF/25V (1) ( 1µF/25V V CC 5VREG RC LIM SOFT CVI CVO C CTL EI EO SGND *1 Rp=1kΩ (3) (4) 100Ω RFG/RRD= 10kΩ to 100kΩ SENSE (1) OUT1P (2) OUT1N (3) OUT2P (4) OUT2N CT=1µF *5 CPWM ...
Page 7
... This is the open collector output, which outputs “L” during rotation and “H” at stop. This pin is left open when it is not in use. *10: <FG pin> Speed detection pin. This is the open collector output, which can detect the rotation speed using the FG output according to the phase change. This pin is left open when it is not in use. LB11850VA No.A0609-7/14 ...
Page 8
... EO pin 0V 2) Timing at startup (soft start pin CTL pin SOFT pin LB11850VA The speed slope is determined by the constant of the RC pin. CR time constant small Determined by LIM pin voltage Small ← CTL signal (PWMDUTY) → Large Large ← EO pin voltage (V) → Small ...
Page 9
... Furthermore, by changing the pulse width as determined by the CR time constant, the VCTL versus speed slope can be changed as shown in the speed control diagram of the previous section. However, since the pulses used are determined by the CR time constant, the variations in CR are output as-is as the speed control error. LB11850VA LB11850VA FG Speed control block Closed Feed-back ...
Page 10
... R = (R×C)/0.01µF .... <3> (R×C)/0.015µF .... <4> The temperature characteristics of the curve are determined by the temperature characteristics of the capacitor of the RC pin. When temperature-caused fluctuations in the speed are to be minimized, use a capacitor with good temperature characteristics. LB11850VA CTL Duty(%) 100% No.A0609-10/14 ...
Page 11
... Based on the above, the resistance is 20kΩ between CVO and CVI and 91kΩ between CVI and GND. Furthermore, the slope changes. (In the case of the example given, since the resistance ratio is 1: 4.5, the slope is now 4.5/5.5 = 0.8 times what it was originally.) If necessary, change the resistance of the RC pin, and adjust the slope LB11850VA CTL Duty(%) LIM VREF SOFT CVI ...
Page 12
... Furthermore, the slope changes. (In the case of the example given, since the resistance ratio is 1: 9.3, the slope is now 9.3/10.3 = 0.9 times what it was originally.) If necessary, change the resistance of the RC pin, and adjust the slope LB11850VA Move in the direction of the Y-axis CTL Duty(%) LIM VREF ...
Page 13
... Divide the resistance of 5VREG, and generate the LIM voltage. In this example, the voltage is 4.3V so the resistance ratio The resistance is 10kΩ between 5VREG and LIM and 62kΩ between LIM and GND. 5VREG LB11850VA CTL Duty(%) CVO pin voltage (V) LIM ...
Page 14
... This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice. LB11850VA 5VREG Connect a capacitor capable of smoothing the pin voltage 1 < ...