ST L6207Q User Manual

ST L6207Q User Manual

L6207Q

DMOS dual full bridge driver

Features

Operating supply voltage from 8 to 52 V

5.6 A output peak current

RDS(on) 0.3 Ω typ. value @ TJ = 25 °C

Operating frequency up to 100 kHz

Non-dissipative overcurrent protection

Dual independent constant tOFF PWM current controllers

Slow decay synchronous rectification

Cross conduction protection

Thermal shutdown

Undervoltage lockout

Integrated fast freewheeling diodes

Applications

Bipolar stepper motor

Dual or quad DC motor

Figure 1. Block diagram

QFN-48 (7 x 7 mm)

Description

The L6207Q is a DMOS dual full bridge designed for motor control applications, realized in BCDmultipower technology, which combines isolated DMOS power transistors with CMOS and bipolar circuits on the same chip. The device also includes two independent constant OFF time PWM current controllers that perform the chopping regulation. Available in QFN48 7x7 package, the L6207Q features thermal shutdown and a non-dissipative overcurrent detection on the high-side Power MOSFETs.

VBOOT

VBOOT

 

 

 

 

 

VSA

 

 

 

VBOOT

 

VBOOT

 

 

CHARGE

 

 

 

VCP

 

 

 

 

 

PUMP

 

 

 

 

 

 

 

 

 

 

 

 

 

OCDA

OVER

 

 

 

 

 

 

 

CURRENT

 

 

 

 

 

 

 

DETECTION

 

 

 

OUT1A

 

 

 

 

 

 

 

 

 

THERMAL

10V

 

10V

 

OUT2A

 

 

 

 

 

 

 

PROTECTION

 

 

 

 

 

ENA

 

 

GATE

 

 

 

 

IN1A

 

 

LOGIC

 

 

 

 

 

 

 

 

 

 

SENSEA

IN2A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOLTAGE

 

PWM

 

 

 

 

REGULATOR

ONE SHOT

MASKING

 

+

 

 

 

 

MONOSTABLE

TIME

SENSE

-

VREFA

 

 

 

 

 

COMPARATOR

 

 

 

10V

5V

 

 

 

 

RCA

 

 

 

 

 

BRIDGE A

 

 

 

 

 

 

 

 

 

OVER

 

 

 

VSB

 

 

 

 

 

 

OUT1B

 

 

OCDB

CURRENT

 

 

 

 

 

DETECTION

 

 

 

OUT2B

 

 

 

 

 

 

 

 

 

 

GATE

 

 

 

SENSEB

ENB

 

 

 

 

 

VREFB

 

 

LOGIC

 

 

 

IN1B

 

 

 

 

 

RCB

 

 

 

 

 

 

IN2B

 

 

 

 

BRIDGE B

 

AM02555v1

November 2011

Doc ID 018993 Rev 2

1/28

www.st.com

Contents

L6207Q

 

 

Contents

1

Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 3

 

1.1

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

 

1.2

Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

2

Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

3

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

4

Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

 

4.1

Power stages and charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

 

4.2

Logic inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

 

4.3

PWM current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

 

4.4

Slow decay mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14

 

4.5

Non-dissipative overcurrent detection and protection . . . . . . . . . . . . . . .

15

 

4.6

Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17

5

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18

6

Output current capability and IC power dissipation . . . . . . . . . . . . . .

20

7

Thermal management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

21

8

Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22

9

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24

10

Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26

11

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

27

2/28

Doc ID 018993 Rev 2

L6207Q

Electrical data

 

 

1 Electrical data

1.1Absolute maximum ratings

Table 1.

Absolute maximum ratings

 

 

 

Symbol

Parameter

Parameter

Value

Unit

 

 

 

 

 

VS

Supply voltage

VSA = VSB = VS

60

V

VOD

Differential voltage between VSA,

VSA = VSB = VS = 60 V;

 

 

OUT1A, OUT2A, SENSEA and VSB,

VSENSEA = VSENSEB =

60

V

 

OUT1B, OUT2B, SENSEB

GND

 

 

VBOOT

Bootstrap peak voltage

VSA = VSB = VS

VS + 10

V

VIN,VEN

Input and enable voltage range

 

-0.3 to +7

V

VREFA,

Voltage range at pins VREFA and VREFB

 

-0.3 to +7

V

VREFB

 

 

 

 

 

VRCA,VRCB

Voltage range at pins RCA and RCB

 

-0.3 to +7

V

VSENSEA,

Voltage range at pins SENSEA and

 

-1 to +4

V

VSENSEB

SENSEB

 

 

 

 

Pulsed supply current (for each VS

VSA = VSB = VS;

 

 

IS(peak)

pin), internally limited by the

7.1

A

tPULSE < 1 ms

 

overcurrent protection

 

 

 

 

 

 

 

IS

RMS supply current (for each VS pin)

VSA = VSB = VS

2.5

A

Tstg, TOP

Storage and operating temperature

 

-40 to 150

°C

range

 

1.2Recommended operating conditions

Table 2.

Recommended operating conditions

 

 

 

Symbol

Parameter

Parameter

Min.

Max.

Unit

 

 

 

 

 

 

VS

Supply voltage

VSA = VSB = VS

8

52

V

 

Differential voltage between VSA,

VSA = VSB = VS;

 

 

 

VOD

OUT1A, OUT2A, SENSEA and VSB,

 

52

V

VSENSEA = VSENSEB

 

 

OUT1B, OUT2B, SENSEB

 

 

 

 

 

 

 

 

VSENSEA,

Voltage range at pins SENSEA and

Pulsed tW < trr

-6

6

V

VSENSEB

SENSEB

DC

-1

1

V

IOUT

RMS output current

 

 

2.5

A

Tj

Operating junction temperature

 

-25

+125

°C

fsw

Switching frequency

 

 

100

kHz

Doc ID 018993 Rev 2

3/28

Pin connection

L6207Q

 

 

2 Pin connection

Figure 2. Pin connection (top view)

 

 

 

 

 

 

 

 

 

RCA

 

NC

SENSEA

 

SENSEA

IN2A

IN1A

 

VREFA

ENA

 

VCP

 

OUT2A

 

OUT2A

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

48

 

47

 

46

 

45

 

44

 

43

 

42

 

41

 

40

 

39

 

38

 

37

 

 

 

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

36

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUT1A

 

2

 

 

 

EPAD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35

VSA

 

 

 

 

OUT1A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VSA

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

33

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

32

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28

 

 

 

 

OUT1B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VSB

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27

 

 

 

 

OUT1B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VSB

 

 

 

 

 

11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

26

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

 

14

 

15

 

16

 

17

 

18

 

19

 

20

 

21

 

22

 

23

 

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RCB

 

NC

SENSEB

 

SENSEB

IN1B

IN2B

 

VREFB

ENB

 

VBOOT

 

OUT2B

 

OUT2B

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AM02556v1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note:

 

The exposed PAD must be connected to GND pin.

 

 

 

 

 

 

 

 

 

 

 

 

Table 3.

Pin description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin

 

Name

Type

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

43

 

IN1A

Logic input

 

Bridge A logic input 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

44

 

IN2A

Logic input

 

Bridge A logic input 2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45, 46

 

SENSEA

Power supply

 

Bridge A source pin. This pin must be connected to power ground

 

 

through a sensing power resistor.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

48

 

RCA

RC pin

 

RC network pin. A parallel RC network connected between this pin and

 

 

ground sets the current controller OFF time of bridge A.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2, 3

 

OUT1A

Power output

 

Bridge A output 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6, 31

 

GND

GND

 

Signal ground terminals. These pins are also used for heat dissipation

 

 

toward the PCB.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10, 11

 

OUT1B

Power output

 

Bridge B output 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

 

RCB

RC pin

 

RC network pin. A parallel RC network connected between this pin and

 

 

ground sets the current controller OFF time of bridge B.

 

 

 

 

 

 

 

 

 

 

 

 

 

15, 16

 

SENSEB

Power supply

 

Bridge B source pin. This pin must be connected to power ground

 

 

through a sensing power resistor.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

 

IN1B

Logic input

 

Bridge B input 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4/28

Doc ID 018993 Rev 2

L6207Q

 

 

Pin connection

 

 

 

 

 

Table 3.

Pin description (continued)

 

 

 

 

 

Pin

 

Name

Type

Function

 

 

 

 

 

18

 

IN2B

Logic input

Bridge B input 2

 

 

 

 

 

19

 

VREFB

Analog input

Bridge B current controller reference voltage. Do not leave this pin open

 

or connect to GND.

 

 

 

 

 

 

 

 

 

 

 

 

 

Bridge B enable. Low logic level switches off all power MOSFETs of

20

 

ENB

Logic input (1)

Bridge B. This pin is also connected to the collector of the overcurrent

 

and thermal protection transistor to implement overcurrent protection. If

 

 

 

 

 

 

 

 

not used, it must be connected to +5 V through a resistor.

 

 

 

 

 

21

 

VBOOT

Supply voltage

Bootstrap voltage needed for driving the upper power MOSFETs of both

 

Bridge A and bridge B.

 

 

 

 

 

 

 

 

 

22, 23

 

OUT2B

Power output

Bridge B output 2.

 

 

 

 

 

26, 27

 

VSB

Power supply

Bridge B power supply voltage. It must be connected to the supply

 

voltage together with pin VSA.

 

 

 

 

 

 

 

 

 

34, 35

 

VSA

Power supply

Bridge A power supply voltage. It must be connected to the supply

 

voltage together with pin VSB.

 

 

 

 

 

 

 

 

 

38, 39

 

OUT2A

Power output

Bridge A output 2.

 

 

 

 

 

40

 

VCP

Output

Charge pump oscillator output.

 

 

 

 

 

 

 

 

 

Bridge A enable. Low logic level switches off all power MOSFETs of

41

 

ENA

Logic input (1)

bridge A. This pin is also connected to the collector of the overcurrent

 

and transistor to implement overcurrent protection. If not used, it must be

 

 

 

 

 

 

 

 

connected to +5 V through a resistor. Thermal protection

 

 

 

 

 

42

 

VREFA

Analog input

Bridge A current controller reference voltage. Do not leave this pin open

 

or connect to GND.

 

 

 

 

 

 

 

 

 

1.Also connected at the output drain of the overcurrent and thermal protection MOSFET. Therefore, it must be driven putting in series a resistor with a value in the range of 2.2 kΩ - 180 kΩ, recommended 100 kΩ.

Doc ID 018993 Rev 2

5/28

Electrical characteristics

L6207Q

 

 

3 Electrical characteristics

VS = 48 V, TA = 25 °C, unless otherwise specified.

Table 4.

Electrical characteristics

 

 

 

 

 

 

 

Symbol

Parameter

 

 

Test condition

Min.

Typ.

Max.

Unit

 

 

 

 

 

 

 

 

 

VSth(ON)

Turn-on threshold

 

 

 

6.6

7

7.4

V

VSth(OFF)

Turn-off threshold

 

 

 

5.6

6

6.4

V

 

 

IS

Quiescent supply current

All bridges OFF; Tj = -25 °C to

 

5

10

mA

 

 

125 °C (1)

 

Tj(OFF)

Thermal shutdown temperature

 

 

 

 

165

 

°C

Output DMOS transistors

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High-side switch ON resistance

Tj = 25 °C

 

0.34

0.4

 

 

 

 

 

 

 

 

 

 

 

RDS(ON)

Tj =125 °C (1)

 

0.53

0.59

Ω

 

 

Low-side switch ON resistance

Tj = 25 °C

 

0.28

0.34

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tj =125 °C (1)

 

0.47

0.53

 

 

 

 

 

 

 

 

IDSS

Leakage current

EN = low; OUT = VS

 

 

2

mA

 

EN = low; OUT = GND

-0.15

 

 

mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Source drain diodes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VSD

Forward ON voltage

ISD = 2.5 A, EN = low

 

1.15

1.3

V

 

 

trr

Reverse recovery time

If = 2.5 A

 

300

 

ns

 

 

tfr

Forward recovery time

 

 

 

 

200

 

ns

Logic input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIL

Low level logic input voltage

 

 

 

-0.3

 

0.8

V

 

 

VIH

High level logic input voltage

 

 

 

2

 

7

V

 

 

IIL

Low level logic input current

GND logic input voltage

-10

 

 

µA

 

 

IIH

High level logic input current

7 V logic input voltage

 

 

10

µA

Vth(ON)

Turn-on input threshold

 

 

 

 

1.8

2

V

Vth(OFF)

Turn-off input threshold

 

 

 

0.8

1.3

 

V

Vth(HYS)

Input threshold hysteresis

 

 

 

0.25

0.5

 

V

Switching characteristics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t

D(on)EN

Enable to out turn ON delay time (2)

I

LOAD

=2.5 A, resistive load

100

250

400

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tD(on)IN

Input to out turn ON delay time

ILOAD =2.5 A, resistive load (dead

 

1.6

 

µs

time included)

 

 

 

t

RISE

Output rise time (2)

I

LOAD

=2.5 A, resistive load

40

 

250

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t

D(off)EN

Enable to out turn OFF delay time (2)

I

LOAD

=2.5 A, resistive load

300

550

800

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tD(off)IN

Input to out turn OFF delay time

ILOAD =2.5 A, resistive load

 

600

 

ns

6/28

Doc ID 018993 Rev 2

L6207Q

 

 

 

 

Electrical characteristics

 

 

 

 

 

 

 

 

Table 4.

Electrical characteristics (continued)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

Parameter

 

 

Test condition

 

Min.

Typ.

Max.

Unit

 

 

 

 

 

 

 

 

 

 

t

Output fall time (2)

I

LOAD

=2.5 A, resistive load

 

40

 

250

ns

FALL

 

 

 

 

 

 

 

 

tdt

Dead time protection

 

 

 

 

0.5

1

 

µs

fCP

Charge pump frequency

-25 °C<Tj <125 °C

 

 

0.6

1

MHz

PWM comparator and monostable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IRCA, IRCB

Source current at pins RCA and

VRCA = VRCB = 2.5 V

 

3.5

5.5

 

mA

RCB

 

 

Voffset

Offset voltage on sense comparator

VREFA, VREFB = 0.5 V

 

 

±5

 

mV

tPROP

Turn OFF propagation delay (3)

 

 

 

 

 

500

 

ns

tBLANK

Internal blanking time on SENSE

 

 

 

 

 

1

 

µs

pins

 

 

 

 

 

 

tON(MIN)

Minimum ON time

 

 

 

 

 

1.5

2

µs

tOFF

PWM recirculation time

ROFF = 20 kΩ; COFF = 1 nF

 

 

13

 

µs

ROFF = 100 kΩ; COFF = 1 nF

 

 

61

 

µs

 

 

 

 

 

IBIAS

Input bias current at pins VREFA and

 

 

 

 

 

 

10

µA

VREFB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Over current detection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Isover

Input supply overcurrent detection

-25 °C<Tj <125 °C

 

4

5.6

7.1

A

threshold

 

ROPDR

Open drain ON resistance

I = 4 mA

 

 

40

60

Ω

tOCD(ON)

OCD turn-on delay time (4)

I = 4 mA; CEN < 100 pF

 

 

200

 

ns

tOCD(OFF)

OCD turn-off delay time (4)

I = 4 mA; CEN < 100 pF

 

 

100

 

ns

1.Tested at 25 °C in a restricted range and guaranteed by characterization.

2.See Figure 3.

3.Measured applying a voltage of 1 V to pin SENSE and a voltage drop from 2 V to 0 V to pin VREF.

4.See Figure 4.

Doc ID 018993 Rev 2

7/28

Electrical characteristics

L6207Q

Figure 3. Switching characteristic definition

 

EN

 

Vth(ON)

 

Vth(OFF)

 

 

t

IOUT

 

90%

 

10%

 

D01IN1316

t

tRISE

tFALL

tD(OFF)EN

tD(ON)EN

 

AM02557v1

Figure 4. Overcurrent detection timing definition

IOUT

ISOVER

ON

BRIDGE

OFF

VEN

90%

10%

tOCD(ON) tOCD(OFF)

AM02558v1

8/28

Doc ID 018993 Rev 2

L6207Q

Circuit description

 

 

4 Circuit description

4.1Power stages and charge pump

The L6207Q integrates two independent power MOSFET full bridges, each power MOSFET

has an RDS(ON) = 0.3 Ω (typical value @ 25 °C) with intrinsic fast freewheeling diode. Cross conduction protection is implemented by using a dead time (tDT = 1 µs typical value) set by

internal timing circuit between the turn-off and turn-on of two power MOSFETs in one leg of a bridge.

Pins VSA and VSB must be connected together to the supply voltage (VS).

Using an N-channel power MOSFET for the upper transistors in the bridge requires a gate drive voltage above the power supply voltage. The bootstrapped supply (VBOOT) is obtained through an internal oscillator and a few external components to realize a charge pump circuit, as shown in Figure 5. The oscillator output (pin VCP) is a square wave at 600 kHz (typically) with 10 V amplitude. Recommended values/part numbers for the charge pump circuit are shown in Table 5.

Table 5.

Charge pump external component values

 

 

Component

 

Value

 

 

 

 

 

CBOOT

 

220 nF

 

CP

 

10 nF

 

RP

 

100 Ω

 

D1

 

1N4148

 

 

 

 

 

D2

 

1N4148

 

 

 

 

Figure 5. Charge pump circuit

 

 

 

VS

D1

CBOOT

 

 

D2

 

 

 

RP

 

 

 

CP

 

 

 

VCP

VBOOT

VSA

VSB

AM02559v1

Doc ID 018993 Rev 2

9/28

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