TDA5147K

Features:

Spindle motor driver
           · Internal 1 A peak current power drivers
           · Low R_ds(on) 1 W max total for high, low and isolation drivers
           · Induction sense start-up option
           · External current sense resistor
           · Soft switching on both upper and lower drivers
           · Programmable linear or PWM spindle mode
           · Provide spindle active dynamic braking mode.
Voice coil motor driver
           · 0.8 Amp VCM power driver
           · Maximum of 1 V drop across the power driver at 0.8 A
           · External current sense resistor, with sense amplifier
           · External current control loop compensation
           · 15 kHz (typ.) VCM current control loop bandwidth
           · Three mode operation: enable VCM, retract, and disable.
Power monitor and retract circuit
           · +5 and +12 V power monitor threshold accuracy ±2%
           · Hysteresis on both power monitor comparators
           · Precision internal voltage generator  ±2%
           · Buffered reference voltage output pin
           · Retract circuit operates down to 2 V
           · Internal thermal sense circuitry with an over temperature shut down option
           · Internal boost voltage generator
           · Sleep mode.


Application

· Hard disk drive for PC products.


Pinout




Specifications

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VCCA1	analog supply voltage 1	indefinite time period	-0.3	6.0	V
		note 1	-0.3	7.0	V
VCCA2	analog supply voltage 2	indefinite time period	-0.3	13.5	V
		note 1	-0.3	15.0	V
Vo	output voltage (pins 2, 12 and 24)		-0.3	20	V
Vn	output voltage on other pins		-0.3	-	V
Tstg	IC storage temperature		-55	+125
Tj	maximum junction temperature		-	+150
Tamb	operating ambient temperature		0	+70

Description

The TDA5147K is an ASIC combination chip that includes the following functions; spindle motor drive, voice coil motor drive, retract, and power-on. The circuit is contained in a 52-pin PLCC package.

The TDA5147K (see Fig.1) is controlled by a custom digital ASIC. The custom ASIC provides the necessary commutation sequences for the spindle drivers via the SCNTL1, SCNTL2 and SCNTL3 inputs. Spindle speed of TDA5147K is monitored by comparator outputs SENU, SENV and SENWIS. Motor speed control is accomplished by a PWM signal (input at the SIPWM pin).

Control of the VCM circuits is via the VIPWMH and VIPWML input signals. These two inputs of TDA5147K provide control of the coil current. The VISENSE2 output signal can be used to monitor the voice coil current.