Datasheet LA6503 Datasheet (SANYO)

Page 1

Overview

The LA6503 was developed for CAV control CD-ROM drives, and provides spindle motor driver, sled motor driver, and sled motion/position detection circuits.

Functions and Features

• CAV control spindle motor driver — Three-phase brushless motor driver —IOmax = 1 A — Built-in FG output circuit (single Hall detection

output) — Reverse braking circuit — Built-in start/stop circuit — Upper side current detection for minimal loss in the

current detection resistor. Also, the voltage drop in

this resistor reduces the IC internal power

dissipation. — Built-in thermal shutdown circuit

• Sled motor driver — One built-in BTL driver channel —IOmax = 1 A — Wide dynamic range — Built-in level shifting circuit — Muting (output on/off) circuit — Built-in thermal shutdown circuit

• Sled motion/position detection circuit — Circuit that provides a pulse output corresponding to

sled motion and position

— This circuit emits 96 pulses for each rotation from

a 24-pole magnet and 90° phase difference Hall element motors, and thus detects the distance moved. It also provides two 48-pulse outputs with differing phases such that the motion direction can be detected from the phase difference between those signals.

• Hall bias power supply — Generates the Hall element 3-V bias voltage. —IOmax = 30 mA, typical

Package Dimensions

unit: mm

3219-QFP34H-C

Monolithic Linear IC

31398HA (OT) No. 5791-1/8

SANYO: QFP34H-C

[LA6503]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

CD-ROM Drive Spindle Motor Driver + Sled Motor

Driver + Sled Motion/Position Detector IC

LA6503

Ordering number : EN5791

Page 2

No. 5791-2/8

LA6503

Parameter Symbol Conditions Ratings Unit

Supply voltage V

max 7 V

Supply voltage V

max 14 V

Input voltage V

max V

Output current I

max Spindle output, sled output 1 A Allowable power dissipation Pd max Independent IC 0.77 W Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +150 °C

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions

Ratings

Unit

min typ max

[Power Supply Current]

Current drain 1 (V

) ICC1 START/STOP = MUTE = 5 V 10 20 mA

Current drain 2 (V

) IM1 START/STOP = MUTE = 5 V 25 50 mA

Quiescent current 1 (V

) ICC2 START/STOP = MUTE = 0 V 5 10 mA

Quiescent current 2 (V

) IM2 START/STOP = MUTE = 0 V 1 5 mA

[Spindle Motor Block]

[Output]

Upper side saturation voltage 1 V

sourceIO

= –0.5 A 1.0 1.5 V

Lower side saturation voltage 1 V

sinkIO

= +0.5 A 0.33 0.80 V

Current limiter voltage setting V

RRE= 0.43 Ω 0.32 V

[Hall Amplifier]

Common-mode input voltage range V

HCOM

1.2 VCC– 1.0 V

Input bias current V

HIB

1 µA

Minimum Hall input level V

HIN

60 mVp-p

[S/S Pin]

High-level voltage VS/SH 2.0 V

V Low-level voltage VS/SL 0.7 V Input current IS/SI VS/S = 5 V 200 µA Leakage current IS/SL VS/S = 0 V –30 µA

[Control]

VC pin input current I

VC= V

CREF

= 2.5 V 1 5 µA

VCREF pin input current I

VCREFVC

= V

CREF

= 2.5 V 1 5 µA

Voltage gain G

VCO

∆VRF/∆V

0.25 Times

Rising edge threshold voltage V

CTH

CREF

= 2.5 V 2.35 2.65 V

Rising edge threshold voltage difference ∆V

CTHVCREF

= 2.5 V 50 150 mV

[Hall Comparator]

Input offset voltage V

HCIOFFSET

10 mV

Input hysteresis V

HCIHYS

8 mV

Output on voltage V

0.3 V

Output off voltage V

* 4.7 V

Output current (sink) I

sink

3 mA

Operating Characteristics at Ta = 25°C, VCC= 5 V, VM= 12 V (unless otherwise specified)

Parameter Symbol Conditions Ratings Unit

Operating supply voltage range

4.6 to 6.0 V

4.6 to 13.0 V

Operating Conditions at Ta = 25°C

Continued on next page.

Page 3

No. 5791-3/8

LA6503

Continued from preceding page.

Parameter Symbol Conditions

Ratings

Unit

min typ max

[Sled Motor Block]

Output offset voltage V

OFF

Voltage difference between outputs –50 +50 mV

Buffer input voltage range V

BIN

1.5 VCC– 1.5 V

Input voltage range V

1.0 VCC– 1.5 V

Source output voltage V

1 RL= 8 Ω 9.5 10.1 V

Sink output voltage V

2 RL= 8 Ω 1.8 2.4 V Closed-circuit voltage gain VG Bridge Amp 12 dB Slew rate S

0.15 V/µs

Muting on voltage V

MUTE

The amplifier output is on when at the high level. 0.7 1.2 2.0 V

[Hall Bias (3-V Output Power Supply)]

Output voltage V

HB-OUTIOUT

= 30 mA 2.5 3.0 3.5 V

Line regulation V

HB-LINVCC

= 4.6 to 6 V, I

OUT

= 30 mA –50 +50 mV

Load regulation V

HB-LOADIOUT

= 5 to 30 mA, VCC= 5 V –200 +200 mV

Truth Table

(Spindle Motor Block)

Inputs: The “H” state is when the + input of the corresponding

phase is 0.2 V or more higher than the – input. The “L” state is when the + input of the corresponding phase is 0.2 V or more lower than the – input.

Note: For items marked with an asterisk (*), the Hall comparator goes to the high level when the S/S pin is off (standby mode).

Source

→ Sink

Input Control

U V W VC

W → V

H H L

V → W L

W → U

H L L

U → W L

V → W

L L H

W → V L

U → V

L H L

V → U L

V → U

H L H

U → V L

U → W

L H H

W → U L

(Sled Motor Block)

Note: “—” indicates that the amplifier output is off.

Input (V

) Mute

Output

SLD-OUT+ SLD-OUT–

H H L L — —

H L H L — —

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No. 5791-4/8

LA6503

Pin Assignment

Page 5

No. 5791-5/8

LA6503

Pin Functions

Pin No. Symbol Function

1 SLED OUT

Sled motor noninverted output

2 SLED OUT

–

Sled motor inverted output 3 P-GND Power system ground 4 P-GND Power system ground 5 SLED-IN Sled motor signal input (The gain is set with a resistor.) 6 V

(5 V) Signal system power supply (5 V)

7 V

REF

Reference voltage input 8 U

–

Three-phase spindle motor hall signal input pin (U phase –) 9 U

Three-phase spindle motor hall signal input pin (U phase +)

10 V

–

Three-phase spindle motor hall signal input pin (V phase –)

11 V

Three-phase spindle motor hall signal input pin (V phase +)

12 W

–

Three-phase spindle motor hall signal input pin (W phase –)

13 W

Three-phase spindle motor hall signal input pin (W phase +)

14 VHB (3Vreg) Hall bias output pin (3-V power supply output) 15 HB

–

Sled motion distance detection hall element input (HB –)

16 HB

Sled motion distance detection hall element input (HB +)

17 HA

–

Sled motion distance detection hall element input (HA –)

18 HA

Sled motion distance detection hall element input (HA +)

19 S-GND Signal system ground 20 P-GND Power system ground 21 P-GND Power system ground 22 MUTE Sled motor output muting (output on/off control) 23 START/STOP Spindle motor output start/stop (output on/off control) 24 FC Phase compensation capacitor connection 25 VC Input for the spindle control signal from the ASP 26 WOUT Three-phase spindle motor output (W phase output) 27 VOUT Three-phase spindle motor output (V phase output) 28 UOUT Three-phase spindle motor output (U phase output) 29 RF Output current detection 30 FG FG signal output 31 V

(12 V) Motor power supply (12 V) 32 POUT Sled motion position detection pulse output P (96 pulses) 33 ROUT Sled motion position detection pulse output R (48 pulses) 34 QOUT Sled motion position detection pulse output Q (48 pulses)

Ambient temperature, Ta – ˚C

Allowable power dissipation, Pdmax – W

Mounted on the specified printed circuit board

Independent IC

Page 6

Block Diagram

No. 5791-6/8

LA6503

Reverse rotation

detection

Matrix

Pulse generator circuit

Control circuit

Hall bias

(3-V regulator)

Current limiter

Reverse

braking

Start/stop

(Spindle motor on/off)

Muting

(Sled motor on/off)

Forward/ reverse

Level

shifter

To each bias circuit

Power system ground

Thermal shutdown

circuit

Page 7

Notes on Gain Adjustment (Sled Motor Block)

• Gain setting The sled motor block gain is set using an external resistor as shown below.

For example, when the external resistor R is 22 kΩ, the gain will be 0 dB when seen as an independent output amplifier and 6 dB when seen as a BTL circuit (between outputs). Referenced to this 22-kΩ resistor, the independent output amplifier gain will be 22k/R (as a multiple) or 20 log(22k/R) dB. Similarly, the BTL gain will be 2×22k/R (as a multiple) or 20 log(22k/R) dB + 3 dB. The level shifting circuits used in current models perform both current and voltage conversion, and thus have a different input type from normal operational amplifiers. The current that flows in the external resistor, that is, the potential difference, becomes the input to AMP1 and AMP2.

• Output offset voltage The output offset voltage is 1/2 VM(typical). The V

–

and V

outputs are converted to outputs that are centered on

this voltage.

No. 5791-7/8

LA6503

(Input)

Resistor R

Page 8

PS No. 5791-8/8

LA6503

Note: When the sled motor rotation direction changes (that is, when the HA and HB phase relationship changes), the R-OUT and Q-OUT phase relationship

changes and the direction can be detected from that phase. The motion distance and position are detected from P-OUT.

This catalog provides information as of March, 1998. Specifications and information herein are subject to change without notice.

■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss.

■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use:

➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.

Sled Position Detection Pulse Waveforms