AN1139 STMicroelectronics, AN1139 Datasheet - Page 6

• Manufacturer Part Number: AN1139
• Description: L6254 - L6268 - L6269 12V DISK DRIVE POWER COMBO IC
• Manufacturer: STMicroelectronics

AN1139 APPLICATION NOTE
1.0 FEATURES
6/64
- GENERAL
12V (+/- 10%) OPERATION.
REGISTER BASED ARCHITECTURE
MINIMUM EXTERNAL COMPONENTS
BICMOS + VERTICAL DMOS TECHNOLOGY (1.5 m)
- VCM DRIVER
1.5A DRIVE CAPABILITY
0.9
LINEAR MODE
PHASE SHIFT MODULATION (PSM MODE)
INSTANTANEOUS, (GLITCH FREE) SWITCH BETWEEN THE TWO MODES.
CLASS AB OUTPUT DRIVERS
ZERO CROSSOVER DISTORTION
14 BIT DAC DEFINE OUTPUT CURRENT
SELECTABLE TRANSCONDUCTANCE
4 PROGRAMMABLE RETRACT VOLTAGE
DYNAMIC BRAKE
- SPINDLE DRIVER
2.0A DRIVE CAPABILITY
0.8
BEMF, INTERNAL / EXTERNAL, PROCESSING, SENSOR-LESS MOTOR COMMUTATION
PROGRAMMABLE COMMUTATION DELAY
LINEAR MODE AND CONSTANT TOFF PWM OPERATION MODE
INTERNAL FREQUENCY LOCKED LOOP SPEED CONTROL (FLL)
BEMF RECTIFICATION DURING RETRACT
RESYNCHRONIZATION
BUILT-IN ALIGN & GO START UP
INDUCTIVE SENSE START UP OPTION
DYNAMIC & REVERSE BRAKE
PROGRAMMABLE OUTPUT SLEW RATE
- OTHER FUNCTIONS
12V, 5V MONITORING WITH EXTERNAL SET TRIP POINTS AND HYSTERESIS
POWER UP/DOWN SEQUENCING
LOW VOLTAGE SENSE
3.3V INPUT LOGIC COMPATIBILITY ( ONLY L6268 AND L6269)
SLUG FOR POWER DISSIPATION (ONLY L6268)
THERMAL SHUTDOWN AND PRE-THERMAL WARNING
TOTAL BRIDGE IMPEDANCE AT 25 C
TOTAL BRIDGE IMPEDANCE AT 25 C