ST L6227 User Manual

DMOS DUAL FULL BRIDGE DRIVER

WITH PWM CURRENT CONTROLLER

■

OPERATING SUPPLY VOLTAGE FROM 8 TO 52V

■ 2.8A OUTPUT PEAK CURRENT (1.4A DC)

■ R

■ OPERATING FREQUENCY UP TO 100KHz

■ NON DISSIPATIVE OVERCURRENT

PROTECTION

■ DUAL INDEPENDENT CONSTANT t

CURRENT CONTROLLERS

■ SLOW DECAY SYNCHRONOUS

RECTIFICATION

■ CROSS CONDUCTION PROTECTION

■ THERMAL SHUTDOWN

■ UNDER VOLTAGE LOCKOUT

■

INTEGRATED FAST FREE WHEELING DIODES

TYPICAL APPLICATIONS

■ BIPOLAR STEPPER MOTOR

■ DUAL DC MOTOR

DESCRIPTION

The L6227 is a DMOS Dual Full Bridge designed for motor control applications, realized in MultiPower-

BLOCK DIAGRAM

0.73Ω TYP. VALUE @ Tj = 25 °C

DS(ON)

OFF

PWM

L6227

PowerDIP24

(20+2+2)

BCD technology, which combines isolated DMOS Power Transistors with CMOS and bipolar c ir cuits on the same chip. The device also includes two independent constant off time PWM Current Controllers that performs the chopping regulation. Available in PowerDIP24 (20+2+2), PowerSO36 and SO24 (20+2+2) packages, the L6227 features a non-dissipative overcurrent protection on the high side Power MOSFETs and thermal shutdown.

PowerSO36

ORDERING NUMBERS:

L6227N (PowerDIP24) L6227PD (PowerSO36) L6227D (SO24)

SO24

(20+2+2)

VBOOT

September 2003

VCP

EN IN1 IN2

V

BOOT

CHARGE

PUMP

OCD

A

THERMAL

PROTECTION

A A A

VOLTAGE

REGULATOR

5V10V

OCD

B

B B B

OVER

CURRENT

DETECTION

GATE

LOGIC

OVER

CURRENT

DETECTION

GATE

LOGIC

V

BOOT

10V 10V

ONE SHOT

MONOSTABLE

MASKING

PWM

TIME

V

BOOT

SENSE

COMPARATOR

BRIDGE A

BRIDGE B

+

-

D99IN1085A

VS

A

OUT1 OUT2

SENSE

VREF

RC

A

V

S

B

OUT1 OUT2 SENSE VREF RC

B

A A

A

B B

B

1/22

L6227

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Test conditions Value Unit

V

S

V

OD

V

BOOT

V

IN,VEN

V

REFA

V

REFB

V

RCA, VRCB

V

SENSEA,

V

SENSEB

I

S(peak)

I

S

, T

T

stg

Supply Voltage Differential Voltage between

VSA, OUT1A, OUT2A, SENSEA and VSB, OUT1B, OUT2B, SENSE

Bootstrap Peak Voltage

VSA =

VSB = V

VSA =

VSB = VS = 60V;

V

SENSEA

B

VSA =

VSB = V

= V

S

SENSEB

S

= GND

60 V 60 V

VS + 10 V

Input and Enable Voltage Range -0.3 to +7 V

,

Voltage Range at pins V and V

REFB

REFA

Voltage Range at pins RCA and RC

B

Voltage Range at pins SENSEA and SENSE

B

Pulsed Supply Current (for each

pin), internally limited by the

V

S

VSA = t

PULSE

VSB = VS;

< 1ms

-0.3 to +7 V

-1 to +4 V

3.55 A

overcurrent protection RMS Supply Current (for each

pin)

V

S

Storage and Operating

OP

VSA =

VSB = V

S

1.4 A

-40 to 150 °C

Temperature Range

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Test Conditions MIN MAX Unit

V

S

V

OD

,

V

REFA

V

REFB

V

SENSEA,

V

SENSEB

I

OUT

T

j

f

sw

Supply Voltage Differential Voltage Between

VSA, OUT1A, OUT2A, SENSEA and VSB, OUT1B, OUT2B, SENSE

Voltage Range at pins V and V

REFB

REFA

Voltage Range at pins SENSEA and SENSE

B

RMS Output Current 1.4 A Operating Junction Temperature -25 +125 °C Switching Frequency 100 KHz

VSA = VSA =

V

SENSEA

B

(pulsed tW < trr) (DC)

VSB = V VSB = VS;

= V

SENSEB

S

852V

52 V

-0.1 5 V

-6

-1

6 1

V V

2/22

L6227

THERMA L D ATA

Symbol Description PowerDIP24 SO24 PowerSO36 Unit

R

th-j-pins

R

th-j-case

R

th-j-amb1

R

th-j-amb1

R

th-j-amb1

R

th-j-amb2

(1) Mounted on a multi-layer FR4 PCB with a dissipati ng copper surface on the bottom side of 6cm2 (with a thickness of 35µm). (2) Mounted on a multi-layer FR4 PCB with a dissipati ng copper surface on the top side of 6cm2 (with a thic kness of 35µm ). (3) Mounted on a multi-layer FR4 PCB with a dissipating copper surface on the top side of 6cm2 (with a thickness of 35µm), 16 via holes

and a groun d l ayer.

(4) Mounted on a multi-layer FR4 PCB without any hea t s i nking surfac e on the board.

PIN CONNECTIONS (Top View)

Maximum Thermal Resistance Junction-Pins 19 15 - °C/W Maximum Thermal Resistance Junction-Case - - 2 °C/W

Maximum Thermal Resistance Junction-Ambient Maximum Thermal Resistance Junction-Ambient Maximum Thermal Resistance Junction-Ambient Maximum Thermal Resistance Junction-Ambient

1

2

3

4

44 52 - °C/W

--36°C/W

--16°C/W

59 78 63 °C/W

IN1 IN2

SENSE

RC

OUT1

GND GND

OUT1

RC

SENSE

IN1 IN2

1

A

2

A

3

A

4

A

5

A

6 7 8

B

9

B

10

B

11

B

12

B

D02IN1346

VREF

24 23 22 21 20

EN VCP OUT2 VS

A

GND19 GND

18

VS

17

B

OUT2

16 15 14 13

VBOOT EN

B

VREF

B

PowerDIP24/SO24

(5) The slug is internally connected to pins 1,18,19 and 36 (GND pins).

GND

N.C. N.C.

VS

OUT2

N.C. N.C. VCP EN

VREF

IN1 IN2

SENSE

RC N.C.

OUT1

N.C. N.C. N.C.

GND GND

1 2 3 4

A

5

A

6 7 8

A

9

A

10 27

A

11

A

12

A

13 24

A

14 15

A

16 17 18

D02IN1347

PowerSO36

36 35 34 33 32 31 30 29 28

26 25

23 22 21 20 19

(5)

GND N.C. N.C. VS

B

OUT2

VBOOT EN

B

VREF IN2

B

IN1

B

SENSE RC

B

N.C. OUT1 N.C.

B

3/22

L6227

PIN DESCRIPTION

PACKA GE

SO24/

PowerDIP24

PowerSO36

Name Type Function

PIN # PIN #

1 10 IN1 2 11 IN2 3 12 SENSE

413RC

5 15 OUT1

6, 7,

18, 19

1, 18,

19, 36

GND GND Signal Ground terminals. In Power DIP and SO packages,

8 22 OUT1 924RC

10 25 SENSE

11 26 IN1 12 27 IN2 13 28 VREF

14 29 EN

A

Logic input Bridge A Logic Input 1. Logic input Bridge A Logic Input 2.

Power Supply Bridge A Source Pin. This pin must be connected to Power

A

Ground through a sensing power resistor.

A

RC Pin RC Network Pin. A parallel RC network connected

between this pin and ground sets the Current Controller OFF-Time of the Bridge A.

Power Output Bridge A Output 1.

A

these pins are also used for heat dissipation toward the PCB.

Power Output Bridge B Output 1.

B

RC Pin RC Network Pin. A parallel RC network connected

between this pin and ground sets the Current Controller OFF-Time of the Bridge B.

Power Supply Bridge B Source Pin. This pin must be connected to Power

B

Ground through a sensing power resistor.

B

Logic Input Bridge B Input 1 Logic Input Bridge B Input 2

Analog Input Bridge B Current Controller Reference Voltage.

B

Do not leave this pin open or connect to GND.

Logic Input (6) Bridge B Enable. LOW logic level switches OFF all Power

B

MOSFETs of Bridge B. This pin is also connected to the collector of the Overcurrent and Thermal Protection transistor to implement over current protection. If not used, it has to be connected to +5V through a resistor.

15 30 VBOOT Supply

Voltage 16 32 OUT2 17 33 VS

Power Output Bridge B Output 2.

B

Power Supply Bridge B Power Supply Voltage. It must be connected to

B

Bootstrap Voltage needed for driving the upper Power MOSFETs of both Bridge A and Bridge B.

the supply voltage together with pin VS

20 4 VS

Power Supply Bridge A Power Supply Voltage. It must be connected to

A

the supply voltage together with pin VS

21 5 OUT2

Power Output Bridge A Output 2.

A

22 7 VCP Output Charge Pump Oscillator Output.

4/22

.

A

.

B

L6227

PIN DESCRIPTION

23 8 EN

(continued)

Logic Input (6) Bridge A Enable. LOW logic level switches OFF all Power

A

MOSFETs of Bridge A. This pin is also connected to the collector of the Overcurrent and Thermal Protection transistor to implement over current protection. If not used, it has to be connected to +5V through a resistor.

24 9 VREF

Analog Input Bridge A Current Controller Reference Voltage.

A

Do not leave this pin open or connect to GND.

(6) Also connected a t t he output drain of the Over cu rrent and Thermal protection M OSFET. Therefore, i t has to be driven pu tti n g in

series a re si stor with a v al ue in the ran ge of 2.2KΩ - 180KΩ, recomme nded 100KΩ.

ELECTRICAL CHARACTERISTICS

(T

= 25 °C, Vs = 48V, unless otherwise specified)

amb

Symbol Parameter Test Conditions Min Typ Max Unit

V

Sth(ON)

V

Sth(OFF)

T

j(OFF)

Output DMOS Transistors

Turn-on Threshold 5.8 6.3 6.8 V Turn-off Threshold 5 5.5 6 V

I

Quiescent Supply Current All Bridges OFF;

S

T

j

= -25°C to 125°C

(7)

510mA

Thermal Shutdown Temperature 165 °C

R

DS(ON)

High-Side +Low-Side Switch ON Resistance

I

DSS

Leakage Current EN = Low; OUT = V

Source Drain Diodes

V

Forward ON Voltage ISD = 1.4A, EN = LOW 1.15 1.3 V

SD

t

Reverse Recovery Time If = 1.4A 300 ns

rr

t

Forward Recovery Time 200 ns

fr

Logic Input

V

th(ON)

V

th(OFF)

V

th(HYS)

Low level logic input voltage -0.3 0.8 V

IL

High level logic input voltage 2 7 V

IH

I

Low Level Logic Input Current GND Logic Input Voltage -10 µA

IL

I

High Level Logic Input Current 7V Logic Input Voltage 10 µA

IH

Turn-on Input Threshold 1.8 2.0 V Turn-off Input Threshold 0.8 1.3 V Input Threshold Hysteresis 0.25 0.5 V

Tj = 25 °C 1.47 1.69 Ω T

=125 °C

j

(7)

S

2.35 2.7 Ω 2mA

EN = Low; OUT = GND -0.3 mA

Switching Characteristics

t

D(on)EN

Enable to out turn ON delay time

(8)

I

=1.4A, Resistive Load 500 800 ns

LOAD

5/22

L6227

ELECTRICAL CHARACTERISTICS (continued)

(T

= 25 °C, Vs = 48V, unless otherwise specified)

amb

Symbol Parameter Test Conditions Min Typ Max Unit

t

D(on)IN

t

RISE

t

D(off)EN

t

D(off)IN

t

FALL

f

Input to out turn ON delay time

Output rise time

(8)

Enable to out turn OFF delay time Input to out turn OFF delay time Output Fall Time

Dead Time Protection 0.5 1 µs

t

dt

CP

Charge pump frequency

(8)

PWM Comparator and Monostable

I

RCA, IRCB

V

offset

Source Current at pins RCA and RC

B

Offset Voltage on Sense Comparator

t

PROP

t

BLANK

Turn OFF Propagation Delay Internal Blanking Time on

SENSE pins

I

=1.4A, Resistive Load

LOAD

1.9 µs

(dead time included) I

=1.4A, Resistive Load 40 250 ns

LOAD

(8)

I

=1.4A, Resistive Load 500 800 1000 ns

LOAD

I

=1.4A, Resistive Load 500 800 1000 ns

LOAD

I

=1.4A, Resistive Load 40 250 ns

LOAD

-25°C<Tj <125°C 0.6 1 MHz

V

(9)

= V

RCA

V

REFA, VREFB

= 2.5V 3.5 5.5 mA

RCB

= 0.5V ±5 mV

500 ns

1µs

t

ON(MIN)

t

OFF

I

BIAS

Minimum On Time 2.5 3 µs PWM Recirculation Time R

OFF

R

OFF

= 20KΩ; C = 100KΩ; C

OFF

= 1nF

Input Bias Current at pins VREFA and VREF

B

Over Current Protection

I

SOVER

R

OPDR

t

OCD(ON)

t

OCD(OFF)

(7) Tested at 25°C in a restricted range and guaranteed by characterization. (8) See Fig. 1. (9) Measured applying a voltage of 1V to pin SEN S E and a voltag e drop from 2V to 0V to pin VREF. (10) See Fig. 2.

Input Supply Overcurrent Protection Threshold

= -25°C to 125°C

T

j

Open Drain ON Resistance I = 4mA 40 60 Ω OCD Turn-on Delay Time (10) I = 4mA; CEN < 100pF 200 ns OCD Turn-off Delay Time (10) I = 4mA; CEN < 100pF 100 ns

(7)

2 2.8 3.55 A

13 61

µs µs

10 µA

6/22

Figure 1. Switching Characteristic Definition

EN

V

th(ON)

V

th(OFF)

I

OUT

90%

10%

D01IN1316

t

D(OFF)EN

t

FALL

Figure 2. Ove rcurrent Detect i on Timi ng Definition

t

D(ON)EN

t

RISE

L6227

t

I

OUT

I

SOVER

ON

BRIDGE

OFF

V

EN

90%

10%

t

OCD(ON)

t

OCD(OFF)

D02IN1399

7/22