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Número de pieza | SA56203S | |
Descripción | One-chip motor driver | |
Fabricantes | NXP Semiconductors | |
Logotipo | ||
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No Preview Available ! SA56203S
One-chip motor driver
Rev. 01 — 31 January 2005
www.DataSheet4U.com
Preliminary data sheet
1. General description
The SA56203S is a one-chip motor driver IC that is capable of driving all motors of CD or
DVD systems e.g. spindle, sled and loading motors and actuators on the optical pick-up
unit. The driver intended for the 3-phase, brushless, Hall-commutated spindle motor uses
True-Silent PWM. This proprietary technology ensures that all 3-phase motor currents are
sinusoidal resulting in an optimally silent driver. Internal regeneration of the back EMF of
the spindle motor enables the driver to operate in current-steering mode without using
external power-dissipating sense resistors. The driver for the 2-phase sled stepper motor
operates in current-steering PWM mode. In addition the IC contains four full-bridge linear
channels that can be used to drive a loading motor and 3D actuators (focus, tracking and
tilt).
The SA56203S is available in an exposed die pad HTSSOP56 package.
2. Features
s True-Silent PWM spindle motor driver
s Low heat generation due to power-efficient direct full-bridge switching of spindle motor
driver
s Controlled spindle motor current during acceleration and brake
s Reverse torque brake function (full bridge)
s Adjustable spindle motor current limiter
s Internal regeneration for EMF of spindle motor
s Current-steering PWM controlled stepper motor driver for sled
s Four class-AB linear channels for loading motor and 3D actuators (focus, tracking and
tilt)
s Tracking actuator driver with back EMF amplifier
s Loading motor driver with transresistance amplifier for loading current
s Low on-resistance D-MOSFET output power stages
s Built-in thermal shutdown and thermal warning
s Interfaces to 3 V and 5 V logic
s Package with low thermal resistance to heatsink (reflowable die pad)
s Lead free package.
1 page Philips Semiconductors
SA56203Swww.DataSheet4U.com
One-chip motor driver
Table 2: Pin description …continued
Symbol
Pin Description
REMF
9 external resistor for EMF regeneration
RLIM
10 external resistor for current limit
VSS1(SPN)
U
11
12
spindle driver ground 1
spindle driver output U
VDD1(SPN)
V
13
14
spindle driver supply voltage 1
spindle driver output V
VSS2(SPN)
W
15
16
spindle driver ground 2
spindle driver output W
VDD2(SPN)
FG
17
18
spindle driver supply voltage 2
frequency generator output
VSSA
19 analog ground
VINSPN 20 spindle driver input voltage for spindle motor current
VINREF
21 reference input voltage for all motor drivers
VDDA
CP1
22 analog supply voltage
23 charge pump capacitor connection 1
CP2 24 charge pump capacitor connection 2
CP3 25 charge pump capacitor connection 3
CTL1
26 driver logic control input 1
CTL2
27 driver logic control input 2
TEMP
28 thermal warning
VINSLD1
29
sled driver 1 input for sled motor current
VINSLD2
30
sled driver 2 input for sled motor current
VLDTRK 31 voltage output loader/track
VSS(SLD)
32 sled driver ground
SLDO2− 33 sled driver output 2 negative
SLDO2+ 34 sled driver output 2 positive
RSLD2
35 sled driver 2 current sense
SLDO1− 36 sled driver output 1 negative
SLDO1+ 37 sled driver output 1 positive
RSLD1
38 sled driver 1 current sense
VDD(SLD) 39 sled driver sense supply voltage
TLTO−
40 tilting driver output negative
TLTO+
41 tilting driver output positive
FCSO−
42 focus driver output negative
FCSO+
43 focus driver output positive
VDD(ACT) 44 focus/tilt drivers supply voltage
VSS(ACT)
45 actuator drivers ground
TRKO−
46 tracking driver output negative
TRKO+
47 tracking driver output positive
LDO−
48 loading driver output negative
LDO+
49 loading driver output positive
9397 750 14192
Preliminary data sheet
Rev. 01 — 31 January 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
5 of 30
5 Page Philips Semiconductors
SA56203Sw w w . D a t a S h e e t 4 U . c o
One-chip motor driver
7.8 Sled motor driver
Two current steering channels are available to drive a stepper motor. Per channel an
external sense resistor Rsense is used that is connected to VDD(SLD). A peak-current control
loop is implemented that modulates the duty cycle of the PWM signal (see Figure 9).
VINSLD 47 kΩ
47 kΩ
VVINREF
input amplifier
VDD(SLD)
Rsense
RSLD
−
+Σ
A
R
Q
S
CLOCK
IRSLD
LOGIC
DRIVE
DRIVER
SLDO+
M
SLDO−
IO
001aab483
Fig 9. Peak-current control architecture of sled motor driver
VSS(SLD)
The clock generator has a nominal frequency of -2f---5o--s-6--c = 70 kHz. See Figure 10, transfer
function from input voltage VVINSLD to output current at a typical Rsense of 0.5 Ω.
Input-to-output transconductance gain can be scaled down by connecting external resistor
Rext in series with the input VINSLD.
IOUT (A)
1A
VVINSLD − VVINREF (V)
dead zone
−30 mV
+1 A/V
30 mV
−1 A
+1 A/V
001aaa436
Fig 10. Transfer function of sled motor driver
Both limiting current and transconductance gain are related to Rsense in the following way:
Transconductance gain:
gm
=
--I---o--
V in
=
2-----×-----R-1---s--e--n---s--e
9397 750 14192
Preliminary data sheet
Rev. 01 — 31 January 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
11 of 30
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet SA56203S.PDF ] |
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