BD6660FV Datasheet | ROHM

Motor driver ICs 3-phase motor driver for CD-ROMs The BD6660FV is low power consumption CD-ROM spindle driver that uses MOS transistor in the output. To meet the requirements for notebook puters, the thin power package SSOP-B28 is used and a PWM drive with a MOS processor output stage achieves an extremely low power consumption. FApplications Portable CD-ROMs, DVDs FFeatures 1) Direct PWM drive. 2) Built-in power save circuit. 3) Built-in current limiter circuit. 4) Built-in FG output. 5) Built-in Hall biasing. FAbsolute maximum ratings (Ta = 25_C) 6) 7) 8) 9) 10) Built-in reverse-rotation prevention circuit. Built-in short brake. Low power consumption with the output MOSFET. Built-in brake mode switching circuit. Built-in rotation detection pin. FRemended operating conditions (Ta = 25_C) Motor driver ICs FBlock diagram Motor driver ICs FPin descriptions FInput and output circuits (1) Power save Motor driver ICs (2) Torque amplifier (3) MODE1 (4) MODE2 (5) Output pin Motor driver ICs (6) Hall bias pin (7) FG output / CP1 output / FR output (8) CP2 / VPUMP output Motor driver ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, VM = 5V) Motor driver ICs Motor driver ICs FApplication example Motor driver ICs FOperation notes (1) Brake mode (MODE1) logic The brake mode is switched by MODE1 pin and the operation is shown in Table-1 below. (3) PWM operation By the voltage potential difference between EC and ECR, the ON duty when switching the low level output transistor changes as shown in Fig. 11 below. (ECR = 1.65V) (2) MODE2 logic The FG output is switched by MODE2 pin and the operation is shown in Table-2 below. (4) Current limiter operation When the RNF voltage bees 0.2V (Typ.), the current limiter circuit activates and limits the PWM ON duty. At this time the output current Iomax is...