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ML5954
_______________________________________________________________ ML5954 4-channel BTL driver for CD-ROM Driver & DVD Player Application
CD-ROM Driver DVD player
Features
Wide Dynamic Range (4.0V(Typ.) When VCC=12V, PVCC=5V and RL=8) Level Shift Circuit on-chip Thermal Shutdown Circuit on-chip Internal Standby Mode. HSOP-28 package
General Description
The ML5954 is a four-channel BTL driver IC for driving the motors and actuators in products such as CD-ROM and DVD. Two channels use current feedback to minimize the current phase shift caused by the influence of load inductance. The IC is used in CD-ROM drivers and DVD players.
Block Diagram
CTKerr1 CTKerr2 VOLD+ VNFTK VOTK+ 15 PVcc2 14 VOFC+ VINTK VINLD VOLDVOTK16 13 VOFCPVcc2
STBY
28
27
26 10k
25
24
23
22 PVcc2
21
20
PGND 19
BIAS
GND
18
17
7.5k + Standby + 20k 7.5k x2 Thermal Shut Down Det Amp 10k 15k Loading Driver PVcc1 Actuator Driver
+
+
-
7.5k
Det Amp x2
Vcc + 10k 25k Vcc PVcc1 PGND 9 PVcc1 10 PGND 11 VOSL12 VOSL+ SLED Driver Actuator Driver
+
-
20k
7.5k + 2 3 CFCerr2 4 VINSL+ 5 VINSL6 VOSL 7 VNFFC
10k 1 VINFC
8 Vcc
BTL Driver for CD-ROM Drivers & DVD Player 1/6
CFCerr1
May, 2004 V1.0
ML5954
_______________________________________________________________ Pin Configuration
CTKerr1 CTKerr2 VOLD+ VNFTK VINTK VOTK+ 15 14 VOFC+ VINLD PVcc2 VOLDVOTK16 13 VOFCPGND 19 STBY BIAS GND 22
28
27
26
25
24
23
21
20
18
17
ML5954
1 VINFC
2 CFCerr1
3 CFCerr2
4 VINSL+
5 VINSL-
6 VOSL
7 VNFFC
8 Vcc
9 PVcc1
10 PGND
11 VOSL-
12 VOSL+
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name VINFC CFCerr1 CFCerr2 VINSL+ VINSLVOSL VNFFC VCC PVCC1 PGND VOSLVOSL+ VOFCVOFC+ Function Focus driver input For connection of capacitor for the error amp filter For connection of capacitor for the error amp filter Op Amp input (+) for the sled driver Op Amp input (-) for the sled driver Op Amp output for the sled driver Focus driver feedback pin Supply voltage Power supply voltage for sled driver block Ground for sled driver block Sled driver output (-) Sled driver output (+) Focus driver output (-) Focus driver output (+) Pin 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin Name VOTK+ VOTKVOLD+ VOLDPGND VNFTK PVCC2 GND VINLD CTKerr2 CTKerr1 VINTK BIAS STBY Function Tracking driver output (+) Tracking driver output (-) Loading driver output (+) Loading driver output (-) Ground for actuator driver block Tracking driver feedback pin Power supply voltage for actuator driver block Ground Loading driver input For connection of capacitor for the error amp filter For connection of capacitor for the error amp filter Tracking driver input Bias input Standby control
Note 1: The indicated polarity for the output pins is defined under the inputs are (+) polarity. The output H bridge power supply pins are PVCC2 for the focus & tracking channel, PVCC1 for the loading channel, and VCC for the pre-block and sled channel. Always ensure that VCC PVCC1/2.
BTL Driver for CD-ROM Drivers & DVD Player 2/6
May, 2004 V1.0
ML5954
_______________________________________________________________ Absolute Maximum Ratings
Parameter Supply Voltage Power Dissipation Storage Temperature Symbol VCC, PVCC1/2 Pd Tstg Ratings 13.5 1.7 *
1
Units V W
o
-55 ~ +150
C
Note 1 : Power dissipation is reduced by 5mW for each increase in TA of 1C over 25C. Note 2 : Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.
Recommended operating conditions
Parameter Operating Temperature Supply Voltage Symbol TOPR VCC PVCC1 PVCC2 Ratings 0 ~ +70 4.3 ~ 13.2 4.3 ~ VCC 4.3 ~ VCC Units
o
C
V V V
BTL Driver for CD-ROM Drivers & DVD Player 3/6
May, 2004 V1.0
ML5954
_______________________________________________________________ Electrical Characteristics
(TA=25C, VCC=12V, PVCC1=PVCC2=5V, VBIAS=2.5V, RL1=RL2=RL3=RL4=8, unless otherwise specified.) Parameter Symbol Conditions Min Typ Max Units Quiescent Current ICC 18 27 mA Standby Current IST 0.5 mA Standby on Voltage VSTON All channel on 0.5 V Standby off Voltage VSTOFF All channel off 2.0 V Actuator driver Output Offset Current IOO -6 6 mA 3.6 4.0 V Maximum Output Amplitude VOM VIN= VBIAS 1.5V Transmission Gain gm 1.3 1.5 1.7 A/V VIN= VBIAS 0.2V Sled Motor Driver / Pre Op-Amp Common Input Voltage Range VICM -0.3 11.0 V Input Bias Current IIB 30 300 nA Output Low Level Voltage VOL No Load 0.8 1.1 V Output Source Current ISO 0.3 0.5 mA Output sink Current ISI ISI 1 mA Sled Motor Driver Output Offset voltage VOOFSL -100 0 100 mV Maximum Output Voltage VOMSL 7.5 9.0 V Closed-Loop Voltage Gain GVSL 18.0 20.0 22.0 dB VIN= VBIAS 0.2V Loading Motor Driver Output Offset Voltage VOOFLD -50 0 50 mV Maximum Output Voltage VOMLD 3.6 4.0 V Closed-Loop GVLD 13.5 15.5 17.5 dB VIN= VBIAS 0.2V Gain Error by Polarity GVLD 0 1 2 dB VIN= VBIAS 0.2V
BTL Driver for CD-ROM Drivers & DVD Player 4/6
May, 2004 V1.0
ML5954
_______________________________________________________________ Application Circuit
DSP
TRACKING VCENTER STANDBY FOCUS
Micro-controller
LOADING
SLED
TRACKING COIL LOADING MOTOR M 5V or 12V 28 27 26 25 24 23 22 21 20 19 18 17 16 15
Rd
ML5954
1
2
3
4
5
6
7 12V
8
9
10
11
12
13
14
5V or 12V
M SLED MOTOR
Rd
FOCUS COIL
Precautions for use
(1) This IC has a built-in thermal shutdown circuit that mutes the output current when the chip temperature reached 175oC (Typ). The hysteresis is set to 25 oC (Typ.), so the driver circuits start up again when the chip temperature falls to 150 oC (Typ.). (2) The driver buffer is switched off when the supply voltage falls below 3.5V (Typ.), and is switched back on when the voltage reaches 3.7V (Typ.) again. (3) In case standby pin voltage under 1.4V or opened, quiescent current is muted. Standby pin voltage should be over 1.8V for normal application. (4) Insert the by-pass capacitor between VCC-pin and GND-pin of the IC as near as possible (approximately 0.1uF) (5) Heat dissipation fins are attached to the GND on the inside of the package. Make sure to connect these to the external GND. Supplement: (Current-feedback driver) The transmission gain (output current/input voltage) is given by :
gm =
1 ( A /V ) ( Rd + RWIRE )
,where RWIRE is the total gold wire resistance inside the package (0.15 0.05) (Typ.).
BTL Driver for CD-ROM Drivers & DVD Player 5/6
May, 2004 V1.0
ML5954
_______________________________________________________________ Mechanical Dimensions HSOP-28 Unit: mm (inch)
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
BTL Driver for CD-ROM Drivers & DVD Player 6/6
May, 2004 V1.0

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