 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
L6256 Datasheet(PDF) 1 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
L6256 Datasheet(HTML) 1 Page - STMicroelectronics |
|
|
1 / 28 page  L6256 12V COMBO DESCRIPTION The 12 Volt Combo chip is a combination spindle motor driver, voice coil driver and D/A converter. The part can be used in,application like HDD. The VCM amplifiers drive a low impedance coil and are set up to accept RC compensation, which allows a wide bandwidth with absolute minimum phase lag. The sense resistor/amplifier arrange- ment allows full current loop operation. The loop gain is changeable by attenuating the VCM DAC voltage amplitude in cascadable stages. The Spindle driver is a PWM only voltage loop with power supply feedforward, driving a 3 phase sensorless brushless DC motor. Since it uses PWM operation at full run speed, it has output slew rate control during start and run modes. There is an inductive clamp circuit to limit flyback voltage transients across the supply voltage dur- ing motor phase changes and during the braking sequence. Only the 2 phase or bipolar commuta- tion pattern is produced by the internal commuta- tion circuitry. A commutation register allows arbi- trary winding sequencing during certain opera- tions. Internal protection against crossover spikes is built in. 3 phase or tripolar commutation can be supported in software during start by writing a commutation pattern directly to the preload register. Tripolar operation requires that more than two phase drivers contribute current simultaneously. The current limit circuitry reflects this and allows 33% higher current limit, which produces nearly December 1997 CHARGE PUMP VPWR 2 UV DETECT POR VCM COMMAND CHANNEL 10 BIT DAC VCM RETRACT VCM CONTROL CLK SYNC SERIAL INTERFACE BANDGAP VOLTAGE REFERENCE CURRENT SOURCES SPINDLE LOGIC SPINDLE SEQUENCER ANALOG TEST MUX 3 24 3.3V LINEAR REGULATOR 3 FEEDFORWARD COMPENSATION VCM LOGIC THERMAL h_vpwr h_vpwr + - A AMP + - B AMP A_OUT B_OUT BRAKE DELAY COUNTER BEMF SENSING ZERO CROSSING DETECTION PWR GND VCM CLASS AB DRIVERS R_ SLEW PWM_ IN PWM_ DC FF_ COMP SP_ CLK upper lower PRE-DRIVERS DYNAMIC CLAMPING SPINDLE DRIVERS CURRENT LIMIT SENSING SH_ OUT BEMF_ DET SP_ G2 SP_ G1 REF_ IN C_TAP SP_C SP_B SP_A SP_P2 SP_P1 VC_PWR A_IN I_VC IO_VC DAC CP_OUT CP_CAP H_VPWR VDD VCC nPOR POR_RC PARK SCLK SDIO CSELB BYPASSC QDRIVE VREG_IN CUR_IN 6,7,17,29,39,40 8 11 36 37 5 38 12 35 44 4 41 3 1 43 42 2 24 23 25 30 26 31 32 18 19 33 34 15 10 9 27 13 14 28 16 20 21 22 D97IN571 SYNC CLAMP Figure 1. Block Diagram PLCC44 ORDERING NUMBER: L6256 1/28 |
Similar Part No. - L6256 |
|
Similar Description - L6256 |
|
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
