Ericsson PBL3776-1NS Datasheet

24-pin plastic DIP package, narrow

PBL 3776/1

Dual Controller IC for High Current

Stepper Motor Applications

Description

The PBL 3776/1 is a switch-mode (chopper), constant-current controller IC intended for controlling external transistors in a high current stepper motor application.The IC has two channels one for each winding of a two-phase stepper motor. The circuit is similar to Ericsson´s PBL 3775/1. PBL 3776/1 is equipped with a Disable input to simplify half-stepping operation.

The PBL 3776/1 contains a clock oscillator, which is common for both driver channels, a set of comparators and flip-flops implementing the switching control, and two output sections each containing four outputs, two source and two sink, intended to drive an external H-bridge.

Voltage supply requirements are +5 V for logic and +10 to +45 V for the outputs.

The close match between the two driver channels guarantees consistent output current ratios and motor positioning accuracy.

Figure 1. Block diagram.

Key Features

• Suitable to drive any external Mos Fet or bipolar power transistor.

•0°C to +85°C operation.

• Few external components.

• Crossconduction prevented by time delay.

• Close matching between channels for high positioning accuracy.

• Digital filter on chip eliminates external filtering components.

• Plastic 24-pin "narrow" DIP package.

PBL3776/1

RC

PBL 3776/1

V

CC

V

CC

SRQ

Logic

S

R

Q

+

–

+ –

+

–

Logic

V

R2

V

BB1

T

1BU

Phase

2

Phase

1

Dis

2

C

2

SGND

2

Pwr GND

2

1BL

T

1AU

T

1AL

T

BB2

V

T

2BU

2AU

T

2AL

T

2BL

T

V

R1

Dis

1

C

1

SGND

1

Pwr GND

1

February 1999

1

PBL 3776/1

2

Figure 3. Definition of terms.

Figure 2. Definition of symbols and test circuit.

Maximum Ratings

Parameter Pin no.* Symbol Min Max Unit

Voltage

Logic supply 13 V

CC

07V

Output supply 6, 19 V

BB

045V

Logic inputs 10, 11, 14, 15 V

I

-0.3 6 V

Analog inputs 8, 9, 16, 17 V

A

-0.3 V

CC

V

Current

Output current t=1mS 2, 3, 4, 5, 20, 21, 22, 23 I

O

-500 +500 mA

Logic inputs 10, 11, 14, 15 I

I

-10 mA

Analog inputs 8, 9, 16, 17 I

A

-10 mA

Temperature

Junction temperature T

J

+150 °C

Storage temperature T

S

-55 +150 °C

Recommended Operating Conditions

Parameter Symbol Min Typ Max Unit

Logic supply voltage V

CC

4.75 5 5.25 V

Supply voltage V

BB

10 40 V

Output emitter voltage V

E

1.0 V

Output current continuous (see text) I

M

-200 +200 mA

Operating ambient temperature T

A

0 +85 °C

Rise and fall time logic inputs t

r,

, t

f

2 µs

Oscillator timing resistor R

T

2 12 20 kohm

* For test purposes only

V

CH

t

d

t

50 %

t

on

t

off

t

V

RC

t

b

V

C

f =

s

t

ontoff

+

1

D =

t

on

off

+

t

on

V

OAV OB

-

I

CC

I

A

4 700 pF

V

CC

V V V

I

IH

IL

V V

A

R

V V V

CH

C

A

V

BB

R

T

12 kΩ

C

T

I

R

V

RC

I

RC

V

OA

RC

PBL 3776/1

V

CC

V

CC

SRQ

Logic

S

R

Q

+

–

+ –

Logic

V

R2

V

BB1

T

1BU

Phase

2

Phase

1

Dis

2

C

2

SGND2Pwr GND

2

1BL

T

1AU

T

1AL

T

BB2

V

T

2BU 2AU

T

2AL

T

2BL

T

V

R1

Dis

1

C

1

SGND1 Pwr GND

1

I

IIH

I

IL

I

V

OB

24

18

23

21

20

22

19

16

171415

12

13

10 11

897

1

2

4 5

3

6

OU

I

OL

I

OL

OU

I

*

Rs

I

BB

PBL 3776/1

3

Electrical Characteristics

Electrical characteristics over recommended operating conditions, unless otherwise noted. 0°C ≤ Tj ≤ +125°C.

Ref.

Parameter Symbol fig. Conditions Min Typ Max Unit

General

Supply current I

CC

2 Note 3. 65 70 mA

Supply current I

CC

2 Dis1= Dis2= HIGH. 7 10 mA

Total power dissipation P

D

VBB= 24 V, I

BB1

= I

BB2

= 200 mA. 0.2 0.3 W

Notes 2, 3. Thermal shutdown junction temperature Note 2 160 °C Turn-off delay t

d

3TA = +25°C, dVC/dt ≥ 50 mV/µs, 1.1 2.0 µs

IBB= 100 mA. Note 2.

Logic Inputs

Logic HIGH input voltage V

IH

2 2.0 V

Logic LOW input voltage V

IL

2 0.6 V

Logic HIGH input current I

IH

2VI = 2.4 V 20 µA

Logic LOW input current I

IL

2VI = 0.4 V -0.2 -0.1 mA

Analog Inputs

Input current I

A

2Vr= 5 V 0.5 0.8 mA

|VC1—VC2| mismatch V

Cdiff

2TA = 25°C Note 3 5 mV

Motor Outputs

Lower transistor saturation voltage 8 I

M

= 200 mA 0.2 0.4 V Lower transistor leakage current 2 Dis1 = Dis2 = High, TA = 25°C50µA Upper transistor saturation voltage 9 I

M

= 200 mA 0.9 1.2 V Upper transistor leakage current 2 Dis1 = Dis2 = High, TA = 25°C50µA

Chopper Oscillator

Chopping frequency f

s

3CT = 4 700 pF, RT = 12 kohm 23.0 kHz

Digital filter blanking time t

b

3CT = 4 700 pF. Note 3. 1.0 µs

Thermal Characteristics

Ref.

Parameter Symbol fig. Conditions Min Typ Max Unit

T

J-A

R

thJ-C

Note 2 28 °C/W

T

J-A

R

thJ-A

Note 2 45 °C/W

Notes

1. All voltages are with respect to ground. Currents are positive into, negative out of specified terminal.

2. Not covered by final test program.

3. Switching duty cycle D = 30%, f

s

= 23.0 kHz.