Optical disc ICs 4-channel PWM driver for CD and MD players BH6510FS The BH6510FS is a 4-channel PWM driver for CD and MD player motors and actuators. The power MOSFET in the output stage assures low power consumption for applications. FApplications CD and MD players FFeatures 1) Internal 4-channel power MOS H-bridge. 2) Adaptable for PWM input. 3) Low ON resistance. 4) Low power consumption. 5) 32-pin SSOP-A package. Compact package. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions 253 Optical disc ICs Block diagram Pin descriptions 254 BH6510FS Optical disc ICs BH6510FS FPin equivalent circuit FElectrical characteristics (unless otherwise noted, Ta = 25_C, VM = 2.5V, VDD = 3V, VG = 10V, fIN = 176kHz, RL = 8Ω * 47µH) 255 Optical disc ICs Measurement circuit 256 BH6510FS Optical disc ICs BH6510FS FCircuit operation fPWM driver The output stage is an H-bridge driver with four N-type FET circuits. Output PWM duty is changed according to input PWM duty. This pulse drives the load (direct PWM). Driver truth table 257 Optical disc ICs Application example 258 BH6510FS Optical disc ICs Operation notes This IC uses three power supplies : VDD, VG and VM. Below are the blocks to which each power supply connects. VDD : control block (INTERFACE) VG : pre drive block VM : H-bridge block BH6510FS As starting VG and VM when VDD is open could cause the top and bottom output MOS to turn on simultaneously before the previous stage logic stabilizes, be sure to design so that VDD starts up first. Electrical characteristic curves 259 Optical disc ICs External dimensions (Units: mm) 260 BH6510FS