LV8762TEVB - ON Semiconductor

May 2017- Rev. 2 LV8762T/D

LV8762T

Overview

The LV8762T is an 1ch H-bridge driver that can control four operation modes

(forward, reverse, brake, and standby) of a motor. The IC is optimal for use in

driving brushed DC motors for office equipment.

Features

• Forward/reverse H-bridge motor driver: 1 channel

• IOmax = 1A

• Built-in current limiter

• Current limit mask function

• Built-in thermal shutdown circuit

• Alert signal output

• Single power supply

• Built-in short-circuit protection function (selectable from latch-type or auto

reset-type).

Applications

• Brush DC Motors

• Computing & Peripherals

• Industrial

Specifications

Absolute Maximum Ratings at Ta = 25C (Note 1,3,4)

Parameter Symbol Conditions Ratings Unit

Supply voltage VM max 36 V

Output peak current IO peak tw  10ms, duty 20% 1.5 A

Output continuous current IO max 1.0 A

Logic input voltage VIN max ST , IN1 , IN2 , EMM -0.3 to +6 V

EMO pin input voltage VEMO -0.3 to +6 V

Allowable power dissipation Pd max Mounted on a specified

board. (Note 2) 1.4 W

Operating temperature Topr -20 to +85 C

Storage temperature Tstg -55 to +150 C

1. Stresses exceeding those listed in the Maximum Rating table may damage the device. If any of

these limits are exceeded, device functionality should not be assumed, damage may occur and

reliability may be affected.

2. Specified circuit board : 57mm57mm1.6mm, glass epoxy both-type board.

3. Absolute maximum ratings represent the value which cannot be exceeded for any length of time

4. Even when the device is used within the range of absolute maximum ratings, as a result of

continuous usage under high temperature, high current, high voltage, or drastic temperature

change, the reliability of the IC may be degraded. Please contact us for the further details

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ORDERING INFORMATION

Ordering Code:

LV8762T-TLM-H

LV8762T-MPB-H

Package

TSSOP24 (225mil)

(Pb-Free / Halogen Free)

Shipping (Qty / packing)

2000 / Tape & Reel --- (TLM)

70 / Fan-Fold --- (MPB)

TSSOP24

(

225mil

)

Motor Driver, H-bridge,

Forward / Reverse

XXXXXXXXXX

YMDDD

XXXXX = Specific Device Code

Y = Year

M = Month

DDD = Additional Traceability Data

GENERIC

MARKING DIAGRAM

† For information on tape and reel specifications, including part

orientation and tape sizes, please refer to our Tape and Reel

Packaging Specifications Brochure, BRD8011/D.

http://www.onsemi.com/pub_link/Collateral/BRD8011-D.PDF

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Recommended Operating Ranges at Ta = 25C (Note 5)

Parameter Symbol Conditions Ratings Unit

Supply voltage range VM 9 to 32 V

VREF input voltage VREF 0 to 3 V

Logic input voltage VIN ST , IN1 , IN2 , EMM 0 to 5.5 V

5. Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the

Recommended Operating Ranges limits may affect device reliability.

Electrical Characteristics at Ta = 25°C, VM = 24 V, VREF = 1.5 V (Note 6)

Parameter Symbol Conditions Ratings

Unit

min typ max

General

Standby mode current drain IMst ST = “L” 100 400 A

Operating mode current drain IM ST = “H”, IN1 = “H”, IN2 = “L”, with no load 3 5 mA

REG5 output voltage VREG IO = -1mA 4.5 5 5.5 V

Thermal shutdown temperature TSD Design guarantee (Note 7) 150 180 200 C

Thermal hysteresis width TSD Design guarantee (Note 7) 40 C

Output block

Output on resistance RonU IO = 1A, upper side ON resistance 0.75 0.97 

RonD IO = -1A, under side ON resistance 0.5 0.65 

Output leakage current IOleak VO = 32V 50 A

Diode forward voltage VD ID = -1A 1.2 1.4 V

Rising time tr 10% to 90% 100 200 ns

Falling time tf 90% to 10% 100 200 ns

Input output delay time tpLH IN1 to OUTA, IN2 to OUTB (L  H) 550 750 ns

tpHL IN1 to OUTA, IN2 to OUTB (H  L) 550 750 ns

Control system input block

Logic input voltage High VINH ST , IN1 , IN2 , EMM 2.0 5.5 V

Low VINL 0 0.8 V

Logic pin input current 1 IINL ST , IN1 , IN2 , EMM

VIN = 0.8V

4 8 12 A

IINH VIN = 5V 30 50 70 A

VREF input current IREF VREF = 1.5V -0.5 A

Current limit comparator

threshold voltage

Vtlim VREF = 1.5V 0.291 0.3 0.309 V

CHOP pin charge current ICHOP -6.5 -5 -3.5 A

CHOP pin threshold voltage VtCHOP 0.8 1 1.2 V

CMK pin charge current ICMK -32.5 -25 -17.5 A

CMK pin threshold voltage VtCMK 1.2 1.5 1.8 V

Charge pump block

Step-up voltage VGH VM = 24V 27.7 28.7 29.7 V

Rising time tONG VG = 0.1F 250 550 s

Oscillation frequency Fcp 90 125 155 kHz

Short-circuit protection block

EMO output saturation voltage VEMO I

EMO = 1mA 0.4 V

SCP pin charge current ISCP SCP = 0V -6.5 -5 -3.5 A

Comparator threshold voltage VtSCP 0.8 1 1.2 V

6. Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the

Recommended Operating Ranges limits may affect device reliability.

7. Design guarantee value and no measurement is made.

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Package Dimensions

unit : mm

TSSOP24 4.4x6.5 / TSSOP24 (225 mil)

CASE 948BA

ISSUE A

SOLDERING FOOTPRINT*

NOTE: The measurements are not to guarantee but for reference only.

(Unit: mm)

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

1.0

5.80

0.32

0.50

LV8762T

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Pin Assignment

2PGND

OUTB

RNF

EMM

SCP

VREF

IN2

IN1

REG5

CP1

OUTA

CP2

OUTA

GND

CMK

21 CHOP

EMO

Top view

LV8762T

Pd max - Ta

1.0

1.5

0.5

2.0

1.40

0.73

—

20 40 60 80200 100

Ambient temperature, Ta - C

Allowable power dissipation, Pd max - W

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Substrate Specifications (Substrate recommended for operation of LV8762T)

Size : 57mm × 57mm × 1.6mm (two-layer substrate)

Material : Glass epoxy both-type board

L1 : Copper wiring pattern diagram L2 : Copper wiring pattern diagram

Cautions

1) For the set design, employ the derating design with sufficient margin.

Stresses to be derated include the voltage, current, junction temperature, power loss, and mechanical stresses such as

vibration, impact, and tension.

Accordingly, the design must ensure these stresses to be as low or small as possible.

The guideline for ordinary derating is shown below :

(1)Maximum value 80% or less for the voltage rating

(2)Maximum value 80% or less for the current rating

(3)Maximum value 80% or less for the temperature rating

2) After the set design, be sure to verify the design with the actual product.

Confirm the solder joint state and verify also the reliability of solder joint for the Exposed Die-Pad, etc.

Any void or deterioration, if observed in the solder joint of these parts, causes deteriorated thermal conduction, possibly

resulting in thermal destruction of IC.

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Block Diagram

TSD

LVS

GND

VGCP2

REG5

SCP EMM

CP1 OUTBOUTA RNF

PGND

VREF

IN1 IN2

CHOP CMK

EMO

Charge pump

Short-circuit

Protection Circuit

Oscillation

circuit

Output control

logic

Output preamplifier stage

Reference

Voltage

Circuit

Current

Limiter

Circuit

Current Limiter

Mask

Brake-Time

Setting Circuit

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Pin Functions

Pin No. Pin Name Pin Functtion Equivalent Circuit

IN1

IN2

EMM

Output control signal input pin 1.

Output control signal input pin 2.

Short protection mode setting.

VREG5

GND

12 ST Standby mode setting

VREG5

GND

9, 10

3, 4

7, 8

5, 6

OUTA

OUTB

RNF

PGND

OUTA output pin.

OUTB output pin.

Motor power-supply connection pin.

Current sense resistor connection pin.

Power ground.

GND

CP1

CP2

Charge pump capacitor connection pin.

Motor power-supply connection pin.

Charge pump capacitor connection pin.

GND

VREG5 16 158 14

Continued on next page.

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Continued from preceding page.

Pin No. Pin Name Pin Functtion Equivalent Circuit

20 VREF Reference voltage input pin for output

current limit setting.

GND

VREG5

17 REG5 Internal reference voltage output pin.

GND

24 EMO Alert signal output

VREG5

GND

CHOP

SCP

Capacitor connection for current limit

break time setting

Capacitor connection for short detection

time setting

GND

VREG5

Continued on next page.

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Continued from preceding page.

Pin No. Pin Name Pin Functtion Equivalent Circuit

23 CMK Capacitor connection for current limit

mask setting

GND

VREG5

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Description of operation

1.Input Pin Function

Each input terminal has the function to prevent the flow of the current from an input to a power supply.

Therefore, Even if a power supply (VM) is turned off in the state that applied voltage to an input terminal, the electric

current does not flow into the power supply.

1-1) Chip enable function

This IC is switched between standby and operating mode by setting the ST pin. In standby mode, the IC is set to

power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not operate

in standby mode.

ST mode Internal regulator Charge pump

“L” or OPEN Standby mode standby standby

“H” Operation mode operation operation

1-2)DCM output control logic

Contol Input Output

Mode

ST IN1 IN2 OUTA OUTB

L * * OFF OFF Standby

H L L OFF OFF Output OFF

H H L H L CW (forward)

H L H L H CCW (reverse)

H H H L L Brake

1-3)Current limit control timing chart

Tchop

SLOW

CHARGE

OUTA

OUTB

Output

current

LIMIT current

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1-4) Setting the time of current limit brake value

This IC can set the time of the current limit break by connecting the capacitor with CHOP-GND.

The value of the capacitor is decided according to the following expression.

brake time: TCHOP ≈ CCHOP × VtCHOP ÷ ICHOP [sec]

VtCHOP:CHOP comparator threshold voltage. TYP = 1.0 [V]

ICHOP:CHOP charge current. TYP = 5 [A]

ex. Cchop = 50[pF]

Tchop[sec] = 50[pF] × 1.0[V] ÷ 5[A] = 10[s]

1-5)Setting the current limit value

The current limit value of the DCM driver is determined by the VREF voltage and the resistance (RNF) connected across

the RNF and GND pins using the following formula :

Ilimit [A] ≈ (VREF [V] ÷ 5) ÷ RNF [])

Assuming VREF = 1.5V, RNF = 1, the current limit is :

Ilimit = 1.5V ÷ 5 ÷ 1  = 0.3 A

1-6) Setting the mask of current limit

CMK mask of current limit

“L” no operation

“H” or OPEN operation

This function can be switched by CMK pin.

This function can prevent the current limit from working by the motor start-up current when the current limit value is set

low.

1-7) Setting the time of the mask of current limit

This IC can set the time of the mask of current limit by connection the capacitor with CMK-GND.

The value of the capacitor is decided according to the following expression.

Time of mask:TCMK ≈ CCMK × VtCMK ÷ ICMK [sec]

VtCMK:CMK comparator threshold voltage. TYP = 1.0 [V]

ICMK:CMK charge current. TYP = 25 [A]

ex. CCMK = 0.1 [F]

TCMK[sec] = 0.1 [F] × 1.5 [V] ÷ 25 [A] = 6[ms]

2.Output short-circuit protection function

Thils IC incorporates an output short-circuit protection circuit.It turns the output off to prevent destruction of the IC if a

problem such as an output pin being shorted to the motor power supply or ground occurs.

Then short-circuit detected, alart signal is assert to EMO pin.

2-1) Output short protect mode

This function can be switched by EMM pin. EMM pin is L or OPEN then latch method, H then auto-retry method.

EMM Pin Method

“L” or OPEN Latch

“H” Auto retry

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2-2) Protection function operation (Latch method)

The short-circuit protection circuit is activated when it detects the output short-circuit state. If the short-circuit state

continues for the internally preset period ( 2 s), the protection circuit turns off the output from which the short-circuit

state has been detected. Then it turns the output on again after a lapse of the timer latch time (TSCP) described later. If the

short-circuit state is still detected, it changes all the outputs to the standby mode and retains the state. The latched state is

released by setting the ST to L.

2-3) Protection function operation (Auto retry method)

In this mode, short-protection function try repeatedly to detecting short-circuit.

The short-circuit detection circuit operates when a short output is detected as well as the latch method. The output is

switched to the standby mode when the operation of the short-circuit detection circuit exceeds time (TSCP) of the timer

latch, and it returns to the turning on mode again after 2 ms (typ). At this time, the switching mode is repeated when is still

in the overcurrent mode until the overcurrent mode is made clear.

2-4)Unusual Condition Warning Output Pin (EMO)

The LV8762T is provided with the EMO pin which notifies the CPU of an unusual condition if the protection circuit

operates by detecting an abnormal condition of the IC. This pin is of the open-drain output type, and if abnormality is

detected, the EMO output becomes (EMO=L) of on.

The EMO pin is placed in the ON state when one of the following conditions occurs.

1. Shorting-to-power or shorting-to-ground occurs at the output pin and the output short-circuit protection circuit is

activated.

2. The IC junction temperature rises and the thermal protection circuit is activated.

2-5)Timer latch-up (TSCP)

The user can set the time at which the outputs are turned off when a short-circuit occurs by connecting a capacitor (CSCP)

across the SCP and GND pins. The value of the capacitor (CSCP) can be determined by the following formula :

Timer latch-up : TSCP T

SCP  CSCP × VtSCP ÷ ISCP [sec]

VtSCP : Comparator threshold voltage (1 V typical)

SCP : SCP charge current (5 A typical)

H bridge

Output state Output ON

Output ON

Outout OFF Stand-by

state

Threshold voltage

SCP voltage

Short-circuit

detection state

Internal counter

Short-

circuit Short-circuit

Release

1st counter

start

1st counter

stop 1st counter

start

1st counter

end 2st counter

start

2st counter

end

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3.Thermal shutdown function

The thermal shutdown circuit is included, and the output is turned off when junction temperature Tj exceeds 180C, and

the abnormal state warning output(EMO pin) is turned on at the same time.

When the temperature falls hysteresis level, output is driven again (automatic restoration) The thermal shutdown circuit

doesn’t guarantee protection of the set and the destruction prevention because it works at the temperature that is higher

than rating (Tjmax = 150C) of the junction temperature

TSD=180C (typ)

ΔTSD=40C (typ)

4.Charge pump Circuit

When the ST pin is set High, the charge pump circuit operates and the VG pin voltage is boosted from the VM voltage to

the VM+VREG5 voltage.

If the VG pin voltage is not boosted to VM + 4 V or more, the output pin cannot be turned on. Therefore it is recommended

that the drive of the motor is started after the time has passed tONG or more.

VM+VREG5

VM+4V

tONG

VG pin voltage

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5.Application Circuit Example

Current limit value

When VREF = 1.5 V,

Ilimit = Vref ÷ 5 ÷ RNF

= 1.5 V ÷ 5 ÷ 1  = 0.3 A

Setting the current limit regeneration time and short-circuit detection time

TSCP  CSCP  VtSCP ÷ ISCP

= 50 pF  1 V ÷ 5 A = 10 s

Setting at current limit mask time

TCMK ≈ CCMK × VtCMK ÷ ICMK

= 0.1 F  1.5 V ÷ 25 A = 6 ms

Setting at current limit brake time

TCHOP ≈ CCHOP × VtCHOP ÷ ICHOP

= 50 pF × 1 V ÷ 5 A = 10 s

* The external part constant is a reference value.

OUTB

RNF

24EMO

23CMK

22SCP

21CHOP

20VREF

IN2

IN1

REG5

CP1

OUTA

CP2

OUTA

GND

LV8762T

0.1 F

PGND

EMM

50pF

Control input

Overcurrent detection

monitor pin

Output current

setting input

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