Electronic Components Datasheet Search
Selected language     English  ▼


TDA5147CH Datasheet(PDF) 8 Page - NXP Semiconductors

Part No. TDA5147CH
Description  12 V Voice Coil Motor VCM driver and spindle motor drive combination chip
Download  32 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

 8 page
background image
1997 Jul 09
8
Philips Semiconductors
Preliminary specification
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
TDA5147CH
FUNCTIONAL DESCRIPTION
Spindle drivers
The spindle section (see Fig.2) contains both the low and
high side drivers (configured as H bridges) for a
three-phase DC brushless motor. Back EMF (Electro
Motive Force) sensing of the commutation rate
(pin SENWIS) is an output to an external digital ASIC
circuit. This circuit should provide the input commutation
control as well. Consequently, all speed control, start-up
routine and commutation control will be generated by the
external digital circuit.
The SIPWM signal from the digital circuit is used to control
the spindle current. This PWM signal is internally filtered.
The output of this filter depends solely on the duty factor.
The pole location of this first order low-pass filter is
controlled by an external capacitor at pin SPWMFLT.
Dynamic braking is possible only during non power-down
situations and must be initiated by the digital circuit.
A 3- level mode line (pin SMODE1) allows for:
• Induction sensing in pre-start-up (SMODE1 = 0.5V
CC5
or high impedance)
• PWM control during start-up (SMODE1 = 0 V)
• Linear control (SMODE1 = VCC5).
SENSING MODE
The induction sensing mode can be used to sense the
rotor position and to spin-up with high current.
To sense the rotor position, one of the BEMF sensor
outputs (pin SENWIS) will be shared with the voltage
comparator that is used for the induction sensing function.
Prior to start-up each phase is excited for a short period of
time. The current from each coil can be monitored via the
multiplexed output (SENWIS). By comparing the rise times
of each phase the rotor position can be determined.
In cases where the spindle motor requires more current to
spin-up, the sensing mode is used with the exception that
the output SENWIS is ignored. The output drivers are
operated in saturation in the sensing mode, so the motor
current is only limited by the power supply. This condition
of induction sense mode can be used to overcome the
head friction and must only be used when needed.
PWM MODE
The PWM mode is normally used during the start-up
phase. Maximum drive voltage is applied to the low drivers
to obtain high start-up torque. The purpose of the PWM
mode is to drive the low drivers into saturation, because
saturation reduces the power dissipation during start-up.
When the spindle current reaches the value destined by
the duty factor of the signal at pin SIPWM, a one-shot is
fired. The output of the one-shot remains HIGH for the
programmed off-time (toff) set by the RC-network at
pin SPWMTC. The one-shot is not retriggerable for
approximately 10% of the off-time, giving a minimum for
the on-time of 0.1toff. During the off-time, the lower spindle
output drivers are switched off. The on-time of the drivers
is determined by the charging time of the coil current.
The turn-off time follows: toff =R × C ln(2)
With R = 68 k
Ω and C = 220 pF, toff = 10.4 µs
The minimum on-time is:
LINEAR MODE
The linear mode is used when the motor is near to its
intended speed. It can also be used at start-up, but higher
power dissipation will occur. In the linear mode the drivers
are controlled by a sensing amplifier. A Miller network is
used to obtain soft switching on the lower drivers. This
prevents large voltage spikes on the motor coils when the
lower drivers are switching. The high drivers are switched
into the linear (resistive) region.
The transconductance gain of the low driver current to filter
voltage can be calculated as follows:
For a 100% duty factor at SIPWM, the nominal voltage at
SPWMFLT = 1.74 V. The calculated coil current for a
100% duty factor (sense resistors Rs = 0.33 Ω) is:
Referencing to the duty factor, the coil current is:
The duty factor is arranged so that at 100%, the voltage
SPWMFLT = 1.74 V and at a 5% duty factor
SPWMFLT = 0 V. This is to ensure that at 0% duty factor
the current will be zero (allowances for circuit tolerances).
The input decoder is driven by three lines which define the
windings to be energized. The input decoder must then
translate these lines to six lines to drive the six output
drivers. The truth table is given in Table 1. The status of
each block in the spindle drive section during the possible
modes of operation is given in Table 4
t
on
CV
I
--------
=
G
m
I
coil
V
SPWMFLT
----------------------------
1
R
s
------
V
SISENH
V
SPWMFLT
----------------------------



1
R
s
------
1
5
---
A/V
=
=
=
=
=
I
coil
1
0.33
-----------
1
5
---
1.74
1.05 A
=
×
×
=
I
coil
1
R
s
------
1
5
---
1.74
0% duty
100
---------------------
×
×
1
R
s
------ 0.348
()
0% duty
100
---------------------
×
=
=
=




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
TDA5147K12 V Voice Coil Motor VCM driver and spindle motor drive combination chip 1 2 3 4 5 MoreNXP Semiconductors
TDA5149G12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip 1 2 3 4 5 MoreNXP Semiconductors
FAN8621B12V Spindle Motor and Voice Coil Motor Driver IC 1 2 3 4 5 MoreFairchild Semiconductor
FAN8620B12V Spindle Motor and Voice Coil Motor Driver 1 2 3 4 5 MoreFairchild Semiconductor
L7207Dual mode disk drive spindle and VCM motor driver 1 2 3 STMicroelectronics
KA2811C12V Spindle Motor and Voice Coil Motor Driver 1 2 3 4 5 MoreFairchild Semiconductor
TLS2205VOICE - COIL MOTOR DRIVER SPINDLE - MOTOR DRIVER AND VOLTAGE MONITOR 1 2 3 4 5 MoreTexas Instruments
HA13556AFCombination of Spindle and VCM Driver designed for HDD and have Following Functions and Features 1 2 3 4 5 MoreHitachi Semiconductor
AN8420FBPSpindle/Voice Coil Motor Drive IC 1 2 3 4 5 MorePanasonic Semiconductor
M63010FPSPINDLE MOTOR AND 4CH ACTUATOR DRIVER 1 2 3 4 5 MoreMitsubishi Electric Semiconductor

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl