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| Optical disc ICs 3-phase motor driver BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS The BA6840BFS, BA6840BFP-Y, BA6840BFP, and BA6842BFS are one-chip ICs designed for driving CD-ROM motors. They are high performance-ICs with a 3-phase, full-wave, pseudo-linear drive system. FApplications CD-ROM / RW, DVD-ROM / PLAYER FFeatures 1) 3-phase, full-wave, pseudo-linear drive system. 2) Start / stop pin; power saving during stop mode. 3) Internal current limit circuit. FBlock diagram 4) Internal thermal shutdown circuit. 5) Internal hall bias circuit. 167 Optical disc ICs BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions 168 Optical disc ICs BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, VM = 12V) 169 Optical disc ICs FElectrical characteristic curves BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS 170 Optical disc ICs BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS FCircuit operation (1) Hall input X output The 3-phase Hall signal is amplified in the hall amplifiers and sent to the matrix section, where the signal is further amplified and combined. After the signal is converted to a current in the amplitude control circuit, the current is supplied to the output driver, which then provides a motor drive current. The phases of the Hall input signal, output voltage, and output current are shown in Fig. 5. (2) Torque control pin The RNF-pin current depends on the torque control input voltage (EC) as shown in Fig. 6. (3) Start / stop pin The motor is in the run mode when the pin input voltage is 3.5V or more, and in the idle mode (all output transistors are off) when the voltage is 1.5V or less. (4) Power ground pin (RNF pin) The RNF pin is the output stage ground pin. Connect a resistor (0.5 recommended) between this pin and the ground to monitor the output current. (5) Phase compensation pin (CNF pin) Connect and adjust a capacitor between this pin and the ground if the output tends to oscillate. 171 Optical disc ICs FPin descriptions BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS FInput / output circuits (1) Start / stop (2) Reversing pin (3) Hall bias 172 Optical disc ICs BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS (4) Torque control input (5) Coil output (6) Hall input (H1), H1*, H2), H2*, H3), H3*) FOperation notes (1) Start / stop The I / O equivalent circuit of the start / stop pin is shown in Fig. 7. The pin has a temperature dependence of *7mV / _C, and the resistance can vary 30%. Take the temperature effect into consideration when designing your application. (2) Hall input The Hall input equivalent circuit is shown in Fig. 12. The Hall devices can be connected in either series or parallel. (3) Thermal shutdown circuit (TSD) The circuit puts the coil outputs (A1, A2, and A3) to the open state at the temperature of 175_C (typical). There is a temperature difference of about 15_C between the temperatures at which the circuit is activated and deactivated. 173 Optical disc ICs FApplication example BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS 174 Optical disc ICs FExternal dimensions (Units: mm) BA6840BFS / BA6840BFP-Y / BA6840BFP / BA6842BFS 175 |
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