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TDA5147CH Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. TDA5147CH
Description  12 V Voice Coil Motor VCM driver and spindle motor drive combination chip
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 9 page
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1997 Jul 09
9
Philips Semiconductors
Preliminary specification
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
TDA5147CH
Table 1
Input decoder truth table for spindle motor drivers
Note
1. x = high impedance.
CONDITION
SCNTL1
SCNTL2
SCNTL3
SDRVU(1)
SDRVV(1)
SDRVW(1)
Disable
LOW
LOW
LOW
x
x
x
Dynamic brake
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
State 1
HIGH
HIGH
LOW
LOW
x
HIGH
State 2
HIGH
LOW
LOW
x
LOW
HIGH
State 3
HIGH
LOW
HIGH
HIGH
LOW
x
State 4
LOW
LOW
HIGH
HIGH
x
LOW
State 5
LOW
HIGH
HIGH
x
HIGH
LOW
State 6
LOW
HIGH
LOW
LOW
HIGH
x
Under voltage
−−−
xxx
VCM driver
The VCM driver (see Fig.1) is a linear, class AB, H-bridge
type power driver with all power devices internal to the IC.
In addition to the power stage a sense resistor enables the
VCM current to be measured. The VCM current is
controlled (see Fig.5) via two PWM signals, VIPWMH and
VIPWML, that are generated by the digital circuit. The signal
at pin VIPWMH weights 32 times more than the signal at
pin VIPWML, thus the current is proportional to the duty
factor of (VIPWML +32 × VIPWMH). These PWM signals are
filtered by using an internal 3rd-order low-pass filter
(Butterworth filter).The bandwidth of this low-pass filter is
nominally 40 kHz (less than 2 degrees lag at 500 Hz), but
the real pole may be adjusted by an external capacitor
connected to pin VFLTINP. The filter output (pin VFLTOUT)
depends on the duty factor of the PWM signals only.
A 3-level mode line (VPCNTL) has been included that will:
• Enable VCM drivers; VPCNTL =VCC5 (normal)
• Disable VCM drivers; VPCNTL = 0.5VCC5 or high
impedance
• Park (soft retract the actuator); VPCNTL =0V.
See Table 2 for the truth table of the VCM driver modes.
Table 2
VPCNTL and SCNTL modes
Note
1. X = don't care.
MODES OF OPERATION AT
POWER GOOD (PORN = HIGH)
VPCNTL INPUT STATE(1)
SCNTL INPUT STATES(1)
SCNTL1
SCNTL2
SCNTL3
VCM enable
VCC5
XXX
VCM disable
0.5VCC5 or high impedance
X
X
X
Park
0 V
X
X
X
Spindle enable
X
see Table 3
see Table 3
see Table 3
Spindle disable
X
LOW
LOW
LOW
Spindle brake
X
HIGH
HIGH
HIGH
Spindle mode
0.5VCC5 or high impedance
LOW
LOW
LOW




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