SANYO LB1921 Datasheet

Overview

The LB1921 is a single-chip motor driver circuit that
provides direct PWM drive output appropriate for driving
the power brushless motors used in office automation
equipment. The LB1921 also provides a variety of
peripheral functions, including speed control and FG
amplifier circuits, on chip.

Applications

• Paper feed and drum motor drivers in FAX and PPC
units

Functions and Features

• The LB1921 is an improved output current version of
the LB1824.

• Three-phase bipolar brushless motor driver

• Digital speed control circuit

• Thermal shutdown circuit

• Start/stop pin

• Lock detector output

• Crystal oscillator and divider circuits

• FG and error amplifiers

• Power supply current limiter

Package Dimensions

unit: mm

3147A-DIP28HS

Monolithic Digital IC

53096HA (OT) No. 5439-1/10

SANYO: DIP28HS

[LB1921]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Three-Phase Brushless Motor Driver

for OA Applications

LB1921

Ordering number : EN5439

No. 5439-2/10

LB1921

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage 1 V

CC

max 30 V

Maximum supply voltage 2 V

M

max 30 V

Output current I

O

max T ≤ 100 ms 3.5 A
Allowable power dissipation 1 Pd max1 Independent IC 3 W
Allowable power dissipation 2 Pd max2 With an arbitrarily large heat sink 20 W
Operating temperature Topr –20 to +80 °C
Storage temperature Tstg –55 to +150 °C

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Power supply voltage range 1 V

CC

9.5 to 28 V

Power supply voltage range 2 V

M

9 to 28 V

FG Schmitt output applied voltage V

FGS

0 to +8 V

Fixed voltage output current 1 I

O

1 7-V output 0 to –20 mA

Fixed voltage output current 2 I

O

2 5-V output 0 to –20 mA

Fixed voltage output current 3 I

O

3 4-V output 0 to –15 mA

FG Schmitt output current I

FGS

0 to +5 mA

Lock detector output current I

LD

0 to +20 mA

Parameter Symbol Conditions

Ratings

Unit

min typ max

Current drain 1 I

CC

1 34 50 mA

Current drain 2 I

CC

2 Stop mode 8 11 mA

Output saturation voltage 1 V

O (sat)

1 IO= 1 A 2.0 3.0 V

Output saturation voltage 2 V

O (sat)

2 IO= 2 A 2.7 4.2 V

Output leakage current I

O leak

100 µA
[7-V Fixed Voltage Output]
Output voltage V

HIO

= –10 mA 6.65 7.0 7.35 V

Voltage variation ∆V

H

1 VCC= 9.5 to 28 V 50 200 mV

Load variation ∆V

H

2 IO= –5 to –20 mA 40 200 mV
[5-V Fixed Voltage Output]
Output voltage V

XIO

= –5 mA 4.45 4.80 5.15 V

Voltage variation ∆V

X

1 VCC= 9.5 to 28 V 50 200 mV
Load variation ∆V

X

2 IO= –5 to –20 mA 5 200 mV
[4-V Fixed Voltage Output]
Output voltage V

FGIO

= –5 mA 3.65 4.0 4.35 V

Voltage variation ∆V

FG

1 VCC= 9.5 to 28 V 40 200 mV

Load variation ∆V

FG

2 IO= –5 to –15 mA 110 200 mV
[Hall Amplifier]
Input bias current I

HB

–4 –1 µA

Common mode input voltage

V

ICM

1.5 5.1 V

range
Hall input sensitivity 60 mVp-p
Hysteresis ∆V

IN

8 14 24 mV

Input voltage low

→ high V

SLH

7 mV

Input voltage high → low V

SHL

–7 mV
[Oscillator]
Output high-level voltage V

OH (CR)

2.8 3.1 3.4 V

Output low-level voltage V

OL (CR)

0.8 1.1 1.4 V

Oscillator frequency f

(CR)

R = 56 kΩ, C = 1000 pF 15 kHz

Amplitude V

(CR)

2.0 Vp-p

Electrical Characteristics at Ta = 25°C, VCC= VM= 24 V

Continued on next page.

No. 5439-3/10

LB1921

Continued from preceding page.

Parameter Symbol Conditions

Ratings

Unit

min typ max
[Current Limiter Operation]
Limiter V

CC-VM

0.4 0.5 0.6 V
[Thermal Shutdown Operation]
Thermal shutdown operating

TSD Design target value 150 180 °C

temperature
Hysteresis ∆TSD 50 °C
[FG Amplifier]
Input offset voltage V

IO (FG)

–10 +10 mV

Input bias current I

B (FG)

–1 +1 µA

Output high-level voltage V

OH (FG)IFG

= –2 mA 5.5 6 V

Output low-level voltage V

OL (FG)IFG

= 2 mA 1 1.5 V
FG input sensitivity Gain: 100× 3 mV
Schmitt width at next stage 100 180 250 mV
Operating frequency range 2 kHz
Open-loop gain f

(FG)

= 2 kHz 45 51 dB
[FGS Output]
Output saturation voltage V

O (FGS)IO (FGS )

= 2 mA 0.1 0.5 V

Output leakage current I

L (FGS)VO

= 5 V 10 µA
[Speed Discriminator]
Output high-level voltage V

OH (D)

4.0 4.3 V

Output low-level voltage I

OL (D)

0.8 1.1 V
[PLL Output]
Output high-level voltage V

OH (P)

3.2 3.5 3.8 V

Output low-level voltage V

OL (P)

1.2 1.5 1.8 V
[Counts] 512
[Lock Detector]
Output low-level voltage V

OL (LD)ILD

= 10 mA 0.15 0.5 V
Lock range 6.25 %
[Integrator]
Input bias current I

B (INT)

–0.4 +0.4 µA

Output high-level voltage V

OH (INT)

3.7 4.3 V

Output low-level voltage V

OL (INT)

0.8 1.2 V
Open-loop gain 60 dB
Gain-bandwidth product 1.6 MHz
Reference voltage –5% VX/2 +5% V
[Crystal Oscillator]
Operating frequency range f

OSC

1 10 MHz
[Start/Stop Pin]
Input high-level voltage V

IH (S/S)

4.0 V

Input low-level voltage V

IL (S/S)

1.5 V

Pull-down resistor R

D (S/S)

30 50 70 kΩ
[Reversing Pin]
Input high-level voltage V

IH (F/R)

4.0 V

Input low-level voltage V

IL (F/R)

1.5 V

Hysteresis ∆V

IN

0.5 V

Pull-down resistor R

D (F/R)

30 50 70 kΩ