Datasheet LB1955 Datasheet (SANYO)

Page 1

Ordering number :EN5452

73097HA (OT) No. 5452-1/7

Functions

• The LB1955 is a 3-phase brushless motor driver IC that is optimal for applications such as driving the drum motor in VCRs.

Features

• Current linear drive

• FG and PG free

• Single-voltage power supply

• Built-in AGC circuit

• Built-in thermal shutdown circuit

Package Dimensions

unit: mm

3222-HSOP28

SANYO: HSOP28

[LB1955]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Monolithic Digital IC

LB1955

Three-Phase Brushless Motor Driver

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

max 14.5 V

Maximum output current I

OUT

1.0 A Allowable power dissipation Pdmax Independent device 0.60 W Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +150 °C

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Supply voltage V

10.2 to 13.8 V Hall input amplitude Vhall At the input 70 to 500 mVp-p VC input voltage V

0 to 5 V

Allowable Operating Ranges at Ta = 25°C

Ambient temperature, Ta – °C

Allowable power dissipation, Pd max – W

Page 2

No. 5452-2/7

LB1955

Electrical Characteristics at Ta = 25°C, VCC= 12 V

Note: * is provided for when X is the peak value at the 60° position of the lower side of the UIN1 Hall amplifier input: THPG = 1.17X.

Parameter Symbol Conditions

Ratings

Unit

min typ max [Power Supply] Current drain I

VC= 0 V, LCTR = 6 V 7.0 10.0 13.0 mA

IC internal power supply V

REF

4.75 5.0 5.25 V

[Output]

Output saturation voltage V

O(sat)

= 400 mA Sink side 0.4 V

= 5 V, Rf= 0 Ω Source side 1.5 V

Output saturation voltage 2 V

O(sat)

= 800 mA Sink side 0.7 V

= 5 V, Rf= 0 Ω Source side 2.0 V

3-phase output current ripple Ior I

= 100 mA, Rf = 0.47 Ω –5 +5 % [Hall Amplifier] Input offset voltage VHoff –20 +20 mV

Input bias current IHb

AGC

= 1.4 V

10 µA

, W

5 µA

Common-mode input voltage range

HCM

2.2 5.0 V [Control] VC pin input bias current I

VCb

VC= 0 V –10 –1.3 µA

Control start voltage V

THVC

Rf= 0.47 Ω, IO≥ 10 mA

2.25 2.5 2.75 V

With the Hall input logic fixed

Open-loop control gain G

MVC

Rf= 0.47 Ω, ∆IO= 200 mA

0.72 0.9 1.08 A/V

With the Hall input logic fixed and VG shorted to RF

[PG] PG Hall amplifier

PGoff

Design target –10 +10 mV

input offset voltage Peak hold charge current I

SHCHG

(U, V, W) = (L, L, H) 30 µA PG comparator threshold THPG Design target* 117 % PG output high-level voltage V

PGH

4.5 5.2 V

PG leakage current I

LEAKPG

–10 0 +10 µA

[FG] Back emf Schmitt input

SCHG

In the back emf Schmitt input increasing direction, Design target 100 mV hysteresis width

In the back emf Schmitt input decreasing direction, Design target 0 mV Ringing canceller Schmitt

SCHR

In the Schmitt input increasing direction, Design target 180 mV input hysteresis width

In the Schmitt input decreasing direction, Design target –20 0 +20 mV FG output high-level voltage V

FGH

FGR = 0 V 4.5 5.2 V FG leakage current I

LEAKFG

–10 0 +10 µA

[TSD] Thermal shutdown

TTSD Design target 180 °C

operating temperature Thermal shutdown

∆TSD Design target 15 °C

temperature hysteresis width

Page 3

No. 5452-3/7

LB1955

Pin Assignment

Source → sink

Hall input logic

U V W 1 W phase → V phase H H L 2 W phase → U phase H L L 3 V phase → U phase H L H 4 V phase → W phase L L H 5 U phase → W phase L H H 6 U phase → V phase L H L

Truth table

Note: The Hall input "H" and "L" values are defined as follows: "H" means that for that phase the (+) input is higher than the (-) input, and "L" means that for

that phase the (+) input is lower than the (-) input. However, note that an input potential difference corresponding to the Hall to output gain is required.

Timing Charts

Note: The Hall inputs are defined as follows: U = UIN1 – UIN2, V = VIN1 – VIN2, and W = WIN1 – WIN2.

Inputs to the Hall input pins must be applied in the phase order shown in the timing chart.

Hall inputs

Synthesized waveform

Page 4

No. 5452-4/7

LB1955

Pin Functions

Pin No. Pin Function

23, 24 U

1, UIN2 U phase Hall element input

25, 26 V

1, VIN2 V phase Hall element input

27, 28 W

1, WIN2 W phase Hall element input 16 UOUT U phase output 15 VOUT V phase output 13 WOUT W phase output 11 LCTR Pin connected to the center points of the coils that are Y-connected to the U, V, and W outputs.

9 V

Power supply

10 V

REF

Reference voltage output

8 GND GND

14 Rf Output current detection

1 VG Closed loop control gain switching 2 FC Speed control loop frequency characteristics correction 3 LIM Output current limit setting 4 VC Speed control 5 PG PG waveform output 6 FG FG waveform output (FGR shorted to GND)

7 FGR PG/FG synthesized output (FGR shorted to PG) 18 SH PG waveform sample-and-hold circuit capacitor connection 22 AGC Connection for the capacitor used by the AGC circuit, which holds the input gain at a fixed level.

12, 17, 19

NC No connection

20, 21

Recommended Special Magnetization Waveforms

Note: Note that the intersections between the special magnetization and general waveforms and the intersections between pairs of general waveforms must

be set up to be 30° apart.

Hall Input Order

Note: The Hall input order must be set up to be W → V → U.

B ≤ A < 7/6 × B 8/6 × D ≤ C ≤ 10/6 × D

Hall input

Page 5

VG and LIM Pin Usage

No. 5452-5/7

LB1955

LIM pin: Open

VG – Rf: Shorted Gm = 0.423/Rf (A/V)

(Closed loop control gain)

Ilim = (V

REF

× 27/200 – 0.2) × 4.23/3/Rf

(Current limit)

VG pin: Open

Gm = 1/Rf (A/V)

(Closed loop control gain)

Ilim = (V

REF

×27/200 – 0.2) ×10/3/Rf

(Current limit)

LIM – V

REF

: Shorted

No current limit.

Note: This current limiting function is for protection against unusual and abnormal currents. If a current limit level below the rated current is set, this will,

inversely, result in heat generation within the IC.

When the LIM pin is open, VG is shorted to Rf, and Rf = 0.47 Ω, this will result in a current limit level of about 1.3 to 1.4 A. If this limit falls under the

rated value due to mode changes or changes in the value of the Rf resistor, set the current limit to an appropriate value by applying to the LIM pin a voltage that is divided from the V

REF

to ground potential by resistors of a few kΩ. Alternatively, short the LIM pin to V

REF

to defeat the current limit

function.

Output

stage

PG and FG Pin Output Circuits FG (FGR shorted to ground)

PG (FGR shorted to PG)

Page 6

Block Diagram

No. 5452-6/7

LB1955

Hall input synthesis block

(linear matrix)

3-phase differential

distribution circuit

Power transistors

FG waveform

synthesis

PG waveform

synthesis

Internal power supply

UIN1 UIN2

VIN1 VIN2

WIN1 WIN2

Page 7

No. 5452-7/7

LB1955

Sample Application Circuit

This catalog provides information as of July, 1997. 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.

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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.

LB1955

0 to 5 V