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ZXBM2001 Datasheet(PDF) 6 Page - Zetex Semiconductors |
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ZXBM2001 Datasheet(HTML) 6 Page - Zetex Semiconductors |
6 / 10 page Locked Rotor timing capacitor (CONT). As these threshold voltages are nominally set to VTHH=2V and VTHL=1V the equations can be simplified as follows: T C I LCK LCKC lock = × 2 T= C I on LCK LCKC T C I LCK LCKD off = 8. CPWM - Sets PWM frequency - external PWM input This pin has an external capacitor attached to set the PWM frequency for the Phase drive outputs. A capacitor value of 0.15nF will provide a PWM frequency of typically 24kHz. The CLCK timing period (Tpwm) is determined by the following equation: T= (V - V ) C I (V V ) C I lock THH THL PWMC THH THL PWMD × + −× Where TPWM is in s C = CPWM +15 in pF IPWM &IPWMD are in A Where VTHH and VTHL are the CPWM pin threshold voltages and IPWMC and IPWMD are the charge and discharge currents. As these threshold voltages are nominally set to VTHH=2V and VTHL=1V the equations can be simplified as follows: T C I C I PWM PWMC PWMD =+ The CPWM pin can also be used as in input for an externally derived PWM signal to control the motor speed. The signal should have a VOL <1V and a VOH >2V. A standard TTL or CMOS digital signal is ideal. When driving from an external PWM source no capacitor should be attached to the CPWM pin and the SPD pin should be left open circuit. 9. PH2 - External transistor driver 10. PH1 - External transistor driver These are the Phase drive outputs and are open darlington emitter followers designed to provide up to 80mA of drive to external transistors as shown in the Application circuits following. The external transistors in turn drive the fan motor windings. ZXBM2001 ZXBM2002 ZXBM2003 SEMICO NDUC TORS ISSUE 4 - OCTOBER 2004 6 |
Similar Part No. - ZXBM2001_04 |
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Similar Description - ZXBM2001_04 |
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