PDF BD8271EFV Data sheet ( Hoja de datos )

Número de pieza	BD8271EFV
Descripción	3ch System Motor Driver
Fabricantes	ROHM Semiconductor
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No Preview Available ! Datasheet System Motor Driver Series for CD・DVD・BD Players 3ch System Motor Driver For Car Audio BD8271EFV General Description BD8271EFV is 3ch power driver developed for driving stepper motor and DC motor (or actuator coil). Blu-ray’s motor & coil can be driven, when used along with 6ch DVD power driver. Features ■ Each driver of SLED (2ch) and Actuator (1ch) are installed in a single-chip. ■ ON/OFF and the standby mode of 3ch can be selected using two control terminals. ■ Built-in triangular wave generator circuit. ■ Adopts HTSSOP-B24 package that has high power dissipation. ■ Built-in thermal shutdown function. ■ Highly effective SLED driver with PWM drive system. ■ Built-in 2ch SLED driver that corresponds to the stepper motor drive. ■ The actuator driver is linear BTL type. Key Specifications ■ Power Supply Voltage ■ Operating Temperature Range 4.5V to 14V -40°C to +85°C ■ Output On Resistance (SLED) ■ Output Saturation Voltage (Actuator) 2.2 Ω (Typ) 0.9 V (Typ) Package HTSSOP-B24 W(Typ) D(Typ) H(Max) 7.80mm x 7.60mm x 1.00mm Applications Car Audio HTSSOP-B24 Typical Application Circuit Figure 1. Application Circuit ○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 1/22 TSZ02201-0G1G0BK00250-1-2 1.Oct.2013 Rev.002 http://www.Datasheet4U.com 1 page BD8271EFV Datasheet Application Information 1. Driver Control (CTL1, CTL2, VC1, VC2) All driver output conditions are controlled by switching the CTL1 and CTL2 terminals to High and Low levels. The table below shows the logic. (1) High and Low levels Terminal Pin No CTL1 Pin21 CTL2 Pin20 VC1 Pin23 VC2 Pin22 L Less than 0.8V Less than 0.4V H More than 2V More than 1V (2) Driver output conditions CTL1 [Pin21] CTL2 [Pin20] LL LH HL HH SLED (Note 1) BTL STBY STBY SB ACTIVE ACTIVE MUTE ACTIVE ACTIVE (Note 1) Refer to the table No.(3). (a) At VC1=L, stepper outputs become MUTE (VC1 Drop MUTE). (b) At VC2=L, BTL outputs become MUTE (VC2 Drop MUTE). (c) At STBY, pre-opamp, internal amplifier, and all outputs are OFF. Outputs become Hi-Z. At MUTE, all outputs are OFF. Outputs become Hi-Z. (d) The states of each terminal at STBY and MUTE At STBY, input terminals (Pin13, 14, 15, 16, 18, 19) become Hi-Z and can not accept any input. In this case, each VC1 and VC2 terminal (Pin23, 22) is pulled-down to GND with an internal resistance of 360kΩ (Typ). At MUTE, BTL outputs are pulled-up to the voltage of VMFC/2 by an internal resistance of 20kΩ (Typ). At VCC Drop MUTE, VC1, 2 Drop MUTE and Thermal Shut Down, outputs become Hi-Z same as MUTE. (3)Mode table for SLED Mode Operation Active SB Normal operation Compulsion short brake (Note 2) (Note 2) In this mode, both outputs (positive and negative) of SLED driver become Low regardless of SAIN input. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 5/22 TSZ02201-0G1G0BK00250-1-2 1.Oct.2013 Rev.002 http://www.Datasheet4U.com 5 Page BD8271EFV Datasheet Gain calculation 1. Actuator (with pre-opamp) VIN VC1 Rｆ INO INN RIN VC1 Rｆ RIN Gain = VO = R f × 2 × 2 VIN R IN RIN = RF(ex.10kΩ) 10kΩ Gain = 10kΩ × 2× 2 = 12dB Rf Vref + RIN ×2×VIN Vo+ ×2 Vref Level shift ×2 Vo- Vref - Rf RIN ×2×VIN ×2 （Vo+）-（Vo-) → 4 times between outputs Vo+ Vref Vo- Figure 11. Gain Calculation for Actuator 2. SLED (with pre-opamp) Iopeak  0.25 VIN R SARNF IO  VO RL Vopeak VIN  0.25 R SARNF  RL At input resistor RIN connect Iopeak = Rf × 0.25 　[A / V] VIN RIN RSARNF Vopeal VIN = Rf RIN × 0.25 RSARNF × RL 　[V / V] VIN Rf INO VC2 INN RIN VC2 Rｆ RIN RSARNF Io SARNF Io: Iopeak SAO + SAO - RL Vo Figure 12. Gain Calculation for SLED www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 11/22 TSZ02201-0G1G0BK00250-1-2 1.Oct.2013 Rev.002 http://www.Datasheet4U.com 11 Page

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