TDA5147CH Datasheet, PDF (9/32 Pages) NXP Semiconductors – 12 V Voice Coil Motor VCM driver and spindle motor drive combination chip

Philips Semiconductors
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
Preliminary specification
TDA5147CH
Table 1 Input decoder truth table for spindle motor drivers
CONDITION
Disable
Dynamic brake
State 1
State 2
State 3
State 4
State 5
State 6
Under voltage
SCNTL1
LOW
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
−
SCNTL2
LOW
HIGH
HIGH
LOW
LOW
LOW
HIGH
HIGH
−
Note
1. x = high impedance.
SCNTL3
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
LOW
−
SDRVU⁽¹⁾
x
HIGH
LOW
x
HIGH
HIGH
x
LOW
x
SDRVV⁽¹⁾
x
HIGH
x
LOW
LOW
x
HIGH
HIGH
x
SDRVW⁽¹⁾
x
HIGH
HIGH
HIGH
x
LOW
LOW
x
x
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, V_IPWMH and
V_IPWML, that are generated by the digital circuit. The signal
at pin V_IPWMH weights 32 times more than the signal at
pin V_IPWML, thus the current is proportional to the duty
factor of (V_IPWML + 32 × V_IPWMH). 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 V_FLTINP. The filter output (pin V_FLTOUT)
depends on the duty factor of the PWM signals only.
A 3-level mode line (V_PCNTL) has been included that will:
• Enable VCM drivers; V_PCNTL = V_CC5 (normal)
• Disable VCM drivers; V_PCNTL = 0.5V_CC5 or high
impedance
• Park (soft retract the actuator); V_PCNTL = 0 V.
See Table 2 for the truth table of the VCM driver modes.
Table 2 V_PCNTL and SCNTL modes
MODES OF OPERATION AT
POWER GOOD (PORN = HIGH)
V_PCNTL INPUT STATE⁽¹⁾
VCM enable
VCM disable
Park
Spindle enable
Spindle disable
Spindle brake
Spindle mode
Note
1. X = don't care.
V_CC5
0.5V_CC5 or high impedance
0V
X
X
X
0.5V_CC5 or high impedance
SCNTL INPUT STATES⁽¹⁾
SCNTL1
X
X
X
see Table 3
LOW
HIGH
LOW
SCNTL2
X
X
X
see Table 3
LOW
HIGH
LOW
SCNTL3
X
X
X
see Table 3
LOW
HIGH
LOW
1997 Jul 09
9