Datasheet TD340ID, TD340 Datasheet (SGS Thomson Microelectronics)

H-BRIDGE QUAD POWER MOSFET DRIVER

■ QUAD N-CHANNEL MOSFET DRIVE

■ INTEGRATED CHARGE PUMPFOR HIGH

SIDE MOSFET DRIVING

■ VERY LOW GROUND EMI NOISE

■ MOTOR SPEED AND DIRECTION CON-

TROL (LOW SIDE PWM)

■ INTERNAL OR EXTERNAL PWM SOURCE

■ 25kHz SWITCHING FREQUENCY ABILITY

■ SYNCHRONOUS HIGH SIDE RECTIFICA-

TION

■ REVERSED BATTERY ACTIVE PROTEC-

TION ABILITY

■ INTEGRATED 5V POWER SUPPLY FOR

MICROCONTROLLER

■ INTEGRATED SECURITY CIRCUITS:

UVLO, OVLO, WATCHDOG

■ 60V MAX RATING

DESCRIPTION

The TD340 integrated circuit allows N-Channel
Power Mosfets driving in a full H-bridge
configuration and is best suited for DC Motor
Control Applications. The four drivers outputs are
designed to allow 25kHz MOSFET switching.

The speedand direction of the motor are to be set
by twopins. Voltage across the motor is controlled
by low side Pulse Width Modulation (PWM). This
PWM feature can be made internally when the
input pinis connectedto an analog signal, or it can
be given directly from a digital source.

An internal charge pump allows proper upper
MOS driving for fullstatic operation (100% PWM).
TD340 achieves very low EMI noise thanks to its
balanced charge pump structure and its drivers
moderate slew rate.
To avoid excessive heating due to free wheeling,
appropriate synchronous rectification is achieved
on the corresponding High Side MOSFET.

Moreover, TD340 integrates a 5V voltage
regulator suitable as a power supply output forthe
microcontroller, a Reset circuit and a Watchdog
circuit.

Security functions disable the TD340 (MOS off)
when abnormal conditions occur like overvoltage,
undervoltage or CPU loss of control (watchdog).

TD340 withstands transients as met in automotive
field without special protection devices thanks to
its 60V BCD technology.

TD340

FOR DC MOTOR CONTROL

PRELIMINARY DATA

D

SO20

(Plastic Micropackage)

ORDER CODE

20
19
18
17
16
15
14
13
12
11

Package

D

OSC
CB1
H1
S1
CB2
H2
S2
L2
L1

Part Number Temperature Range

TD340ID -40°C, +125°C •

D=Small Outline Package (SO) - also available in Tape & Reel (DT)

PIN CONNECTIONS (top view)

VBATT

VOUT

RESET

CWD

WD

STBY

TEMP

IN1
IN2

1
2
3
4
5
6
7
8
9

CF GND

10

May 2000

This is preliminary information on anew product now in development or undergoing evaluation. Details are subject to change without notice.

1/21

SYSTEM AND INTERNAL BLOCK DIAGRAM

TD340

BATT+

5V

µCONTROLLER

0V

VBATT

VOUT

SUPPLY

UVLO
OVLO

RESET

CWD

RESET

WATCHDOG

WD

STBY

TEMP

IN1

T°

PWM

LOGIC

PWM

IN2

CF GND

TD340

OSC
CB1
H1
S1
CB2
H2
S2
L2
L1

Q2H

Q2L

Q1H

M

Q1L

BATT-

PIN DESCRIPTION

Name Pin Type Function

VBATT 1 Power Input Power Supply

GND 11 Ground Ground

L1 12 Push Pull Output Low Side Drive - Gate 1

L2 13 Push Pull Output Low Side Drive - Gate 2
H1 18 Push Pull Output High Side Drive - Gate 1
H2 15 Push Pull Output High Side Drive - Gate 2
S1 17 Analog Input High Side Drive - Source 1
S2 17 Analog Input High Side Drive - Source 2

CB1 19 Analog Input High Side Drive - Bootstrap Capacitor 1
CB2 16 Analog Input High Side Drive - Bootstrap Capacitor 2

CF 10 Analog Input External Capacitor to set the PWM Switching Frequency

IN1 8 Analog or Digital Input
IN2 9 Digital Input Direction to the Motor’s Rotation

STBY 6 Digital Input Standby Mode
TEMP 7 Analog Output Analog Indicator of Temperature
VOUT 2 Power Output Regulated Power Supply Output for the Microcontroller - 5V

RESET 3 Open Drain Output Reset Signal for the Microcontroller

WD 5 Digital Input Watchdog Signal from the Μicrocontroller

CWD 4 Analog Input External Capacitor to set Watchdog Timeout

OSC 20 Digital Output Oscillator Output

Analog Level of PWM (0 to 100%) if CF connected to a capacitor,
or PWM Signal if CF connected to ground

2/21

TD340

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

Batt

P

T

stg

ESD Electrostatic Discharge 2 kV

V

digital

V

lowgate

V

power

V

osc

T

R

hja

Notes:

1. The duration of the 60V voltage must be limited to 1 second if current is drained from the Vout regulator. Supply voltage in steady state
must be limited to ensure that dissipation rating is not exceeded.

2. The magnitude of input and output voltages must never exceed Vbatt+0.3V or 60V, whichever is less, except for H1 and H2: Vbatt+15V
or 60V, whichever is less.

OPERATING CONDITIONS

Positive Supply Voltage - Note 1 60 V
Power Dissipation 500 mW

d

Storage Temperature -55 to +150

Voltage on pins: IN1, IN2, STBY,WD, CWD, CF,TEMP,VOUT,
RESET

-0.3 to 7 V

Voltage on pins: L1, L2 -0.3 to 15 V
Voltage on pins: H1, H2, S1, S2, CB1, CB2 - Note 2 -0.3 to 60 V
Voltage on pin OSC Vbatt-6.5 to Vbatt V
Maximum Junction Temperature 150 °C

j

Thermal Resistance Junction-Ambient 85 °C/W

o

C

Symbol Parameter Value Unit

V

T

Positive Supply Voltage 6.5 to 18.5 V

batt

Operating Free Air Temperature Range -40 to +125 °C

oper

3/21

TD340

ELECTRICAL CHARACTERISTICS

Vbatt= 12V, Tamb=-40°C to 125°C (unless otherwise specified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

TotalSupply Current

I

CC

T

min.<Tamb<Tmax.

I

stdby

Standby

Standby

UVLO

OVLO

Supply Current in Standby Mode
STDBY Pin Voltage for Standby OFF 0.8 V

H

STDBY Pin Voltage for Standby ON 2 V

L

Under Voltage Lockout - when
Vbatt<UVLO all buffer outputs are low

Under Voltage Lockout - when
Vbatt>OVLO all buffer outputs are low

DRIVERS - Cbootstrap=47nF

V

V
Freq Switching Frequency of PWM Cf = 270pF 20 25 30 kHz

I

I

Static Gate-Source High Side Mosfet Volt-

gs

age (charge pump)
Dynamic Gate-Source High Side Mosfet

gsd

Voltage (bootstrap)

Dead Time for secure Synchronous

t

d

Rectification
Output Current Capability - Low Side

Source

outl

Sink

Output Current Capability - High Side
Source

outh

Sink

OSCILLATOR - Rosc=5.6k - Note 1

F

V

Frequency of internal Step up converter

osc

Oscillator

Oscillator Swing - note 7

osc

T=25°C

-40°C < T < 125°C
T=25°C

-40°C < T < 125°C

Vbatt decreasing
Hyst. = 100mV typ.

Vbatt decreasing
Hyst. = 300mV

5.8 6.2 6.5 V

18.5 20 21.5 V

4.557
10mAmA

180 300

350µAµA

No Bootstrap Cap 8 11 15 V

9V

Cf=270nF,IN1=2.4V
No Load
Cload=4nF

T=25°C
40°C < T < 125°C
T=25°C
40°C < T < 125°C

T=25°C
40°C < T < 125°C
T=25°C
40°C < T < 125°C

T=25°C
40°C < T < 125°C

Vbatt = 12V
Vbatt = 9V

Vbatt > UVLO

2.1 2.8

30
25
60
50

30
25
60
50

0.6

0.5

6.25

6.25

5.1

1.5

50

50
100
100

50

50
100
100

111.4

3.5 µs

100
100
150
150

100
100
150
150

1.5
12

12

12.5

µs

mA
mA
mA
mA

mA
mA
mA
mA

MHz
MHz

V
V
V

4/21

TD340

ELECTRICAL CHARACTERISTICS (continued)

Vbatt= 12V, Tamb=-40°C to 125°C (unless otherwise specified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

VOLTAGE REGULATOR - Co=220nF - note 2

V

Line
Reg

Load

Reg

Output Voltage

out

Line Regulation

Load Regulation

I

Maximum Output Current

o

I

Output Current Short Circuit Vout=0 100 200 mA

os

RESET SUPERVISORY CIRCUIT - note 3

Vt

V

V

Threshold Voltage Vout Increasing

hi

Threshold Voltage Vout Decreasing

thd

k

Linearity coefficient (Vthi = ki Vout) 0.86

i

k

Linearity coefficient (Vthd = kd Vout) 0.84

d

Hysteresis Threshold Voltage 50 100 200 mV

hys

t

Response Time High to Low 5 µs

phl

WATCHDOG CIRCUIT

t

Watchdog Time Out Period

wd

t

t

reset

Watchdog Input Pulse Width for Proper

ipw

Retrigger
Watchdog Input Rise Time for Proper

t

ipr

Retrigger
Reset Pulse Width 10 20 40 µs

TEMPERATURE OUTPUT

V

Output Voltage

T

∆V

Notes :

1. For proper operation, a 5.6k resistor needs to be connected between OSC and GND.

2. 220nF is the optimized value for the voltage regulator

3. The reset thresholds (Vout increasing and decreasing) are proportional to Vout, (coefficients kiand kd). ki and kd vary in the same direc­tion with temperature.

4. Watchdog capacitor Cwd should be placed as close as possible to CWD pin.

Output Temperature Drift -7 -7.5 -7.8

T

Io=20mA
T=25°C
40°C < T < 125°C

6V < Vbatt < 16V,Io=20mA
T=25°C
40°C < T < 125°C

0 ≤ Io ≤ 40mA
T=25°C
40°C < T < 125°C

Vbatt = 12V
6V < Vbatt < 16V

T=25°C
40°C < T < 125°C

T=25°C
40°C < T < 125°C

No ext. capacitor
Cwd = 47nF - note 4

o

T= 25

C

4.6

4.5

5
5

5.4

5.5

100
150mVmV

2040mV

mV

40
20

4.0

3.9

3.9

3.8

0.5

0.7

4.3 4.5

4.2 4.4

1
1

4.6

4.5

2

1.5

mA
mA

ms

0.1 µs

0.1 µs

2.58 2.68 2.78 V

mV/oC

V
V

V
V

V
V

s

5/21

INTERNAL ELECTRICAL SCHEMATIC AND APPLICATION ENVIRONMENT

TD340

BATT +

S1

H1

CB1

OSC

CB2

Q1H

Q2H

H2

Q1L

+

A

M

-

Q2L

L1

L2

S2

BATT -

GND

UVLO/ OVLO

OSC

filter

-

+

TD340

6/21

5V REGULATOR

VOUT

VBATT

5V

RESET

RESET

WATCHDOG

WD

CWD

STBY

STBY

T°

TEMP

1.2V

IN1

µCONTROLLER

+

-

3.6V

CF

IN2

0V

TD340

FUNCTIONAL DESCRIPTION

Speed and Direction Control:

The TD340 IC provides the necessary interface between anH-Bridge DC-Motor Control configuration and
a micro controller. The speed and direction are given by two input signals coming from the
microprocessor.

Speed Control:
Speed control is achieved by Pulse Width Modulation (PWM).
The TD340 provides an internal PWM generator, but can accept an external PWM waveform.
IN1 can accept two different types of inputs:

- an analog input between 0 and 5V (CF must be connected to set the PWM frequency) gives an analog
value of the Internal PWM duty cycle

- a digital input (CF must be grounded) gives directly the PWM
Figure 1 represents the Duty Cycle curve versus the IN1 analog voltage.
Figure 2 shows how to use the TD340 with an analog input or a digital input.

The speed control (or duty cycle) is achieved by the Low Side Drivers which impose the PWM function
while the cross-corresponding High Side MOSFETS is kept fully ON.

Direction Control:
IN2 accepts a digital value of the rotation direction.

Brake mode:
Brake mode is achieved by a zero level on the IN1 input.
The IN2 input selects low side or high side braking.
Brake mode is activated when the IN1 is at zero volt level for more than 200 us.

Figure 1 : Duty Cycle versus IN1 voltage

Duty Cycle

100%

0%

1.2V 3.6V IN1

Voltage

7/21

Figure 2 : PWM Analog and Digital Modes

TD340

Vbatt

M

TD340

µP

5V

IN1

0V

ANALOG INPUT
+ CF (270pF)

PWM
PWM

CF

Vbatt

TD340

µP

M

PWM OUTPUT PWM OUTPUT

5V

IN1

0V

CF

DIGITALINPUT
+ CF GROUNDED

PWM
PWM

Active (synchronous) rectification for free-wheel current

A motor is an inductive load. When driven in PWM mode, motor current is switched on and off at the
25kHz frequency.When theMOS is switched off,currentcan not instantaneously dropto zero, a so-called
”free-wheel” current arises in the same direction than the power current. A path for this current must be
provided, otherwise high voltage could arise and destroy the component. The classical way to handle this
situation is to connect a diode in an anti-parallel configuration regarding to the MOS, so that current can
continue to flow through this diode, and finally vanishes by the means of ohmic dissipation, mainly in the
diode due to its 0.8V direct voltage. For high currents, dissipation can be an important issue (eg: 10A x

0.8V makes 8 W!). Furthermore, high speed diodes have to be used, and are expensive.
A more efficient way to handle this problem is to use the high side MOS as a synchronous rectifier. In this

mode, the upper MOS is switched ON when the lower one is switched OFF, and carries the free-wheel
current with much lower ohmic dissipation. Advantages are : one expensive component less (the fast
power diode), and more reliability due to the lower dissipation level.

However, we have to take care not to drive the two MOS simultaneously. To avoid transient problems
when the MOSare switched, a deadtime is inserted between the opening of one MOS, and the closing of
the otherone. In theTD340 device, the deadtimeis fixed to about 2.5 microseconds. Thisvalue is the time
between the commands of the gate drivers, not the deadtime between the actual MOS states because of
the rising and falling times of the gate voltages (due to capacitance), and the MOS characteristics. The
actual value of the deadtime for a typical configuration is about 1.5 microseconds.

Figure 3 shows the synchronous rectification principle
Table 1 summarizes the status of the Mosfets (and the speed and direction ofthe motor) according to the

Inputs (IN1 and IN2) status in analog and logic modes.

8/21

TD340

Figure 3 : Synchronous Rectification Principle

ex1:
Speed: PWM=x%

No synchronousrectification

1-x%

FULL

OFF

PWM

M

x%

FULL
ON

FULL
OFF

HIGH DISSIPATION

THROUGH FREE WHEEL DIODE!

Table 1 : Function Table in Digital and Analog Modes

Stby

State

Disable

State

IN1 (V)

IN2

(V)

digital analog Q1L Q1H Q2L Q2H

Mosfets Status

ex2:
Speed: PWM=x%

With synchronousrectification - TD340

1-x%

PWM

FULL
ON

M

PWM

x%

LOW DISSIPATION

THROUGH LOW Rdson!

Comments

FULL
OFF

1 X X X X OFF OFF OFF OFF Motor Off in Standby Mode

X 1 X X X OFF OFF OFF OFF Motor Off in Disable Mode

0 0 0 idle 0 to 1.2 0 ON OFF ON OFF Motor Brake Low

0 0 0 idle 0 to 1.2 5 OFF ON OFF ON Motor Brake High

0 0 PWM 1.2 to 3.6 0 OFF ON PWM !PWM Motor x% Forward
0 0 PWM 1.2 to 3.6 5 PWM !PWM OFF ON Motor x% Backward

0 0 5 idle 3.6 to 5 0 OFF ON ON OFF Motor 100% Forward
0 0 5 idle 3.6 to 5 5 ON OFF OFF ON Motor 100% Backward

Notes:

- Standby state is active when STBY pin is pulled low

- Disable state is active when one of the following conditions is met: UVLO, OVLO, Reset, Watchdog Timeout.

9/21

TD340

MOS drivers

Output drivers are designed to drive MOS with gate capacitance of up to 4 nF. A small resistor in serial
with gateinput is recommended to prevent spurious oscillations due to parasitic inductance inconjunction
with gate capacitance. Typical value of these resistors are from 10 to 100 ohms, depending on the MOS
characteristics.

Charge pump
To drivethehigh side MOS, theTD340 has to provide a voltage of about 10V higher that the power supply

voltage. The TD340 provides an internal charge pump which acts as a voltage tripling generator clamped
to 12V and allows the output of correct gate voltage with power voltage level as low as 6.5V. Its double
balanced structure ensures low EMI Ground Noise. The internal charge pump is used to achieve correct
voltage level at startup or static states.

An 5.6k resistor needs to be connected between OSC and GND for proper operation.
Bootstrap capacitors
To achieve dynamic driving up to 25kHz, it is necessary to support the internal charge pump with

bootstrap capacitors.
Bootstrap capacitorsare charged from Vbat when thelower MOS is ON. When the lower MOS isswitched

off and the upper one is switched ON, the bootstrap capacitor provides thenecessary current to the driver
in order to charge the gate capacitor to the right voltage level.

A design rule to select the bootstrap capacitor value is to choose ten times the gate capacitance.
For example, MOS with 4 nF gate capacitance will require bootstrap capacitors of about 47nF.
MOS gate discharge
The high side MOS are switched off with internal Gate to Source discharge (not Gate to Ground

discharge) to prevent the Gates from negative transient voltages.
Figure 4 : Typical waveforms on low and high side MOS gates.

Upper trace : High side MOS gate
Lower trace : Low side MOS gate

10/21

TD340

Reversed battery active protection

In full H-bridge configuration, there is a risk in case of power voltage reversal due to the intrinsic diodes
inside the MOS. A passive protection solution is to wire a diode between the H-bridge and the power
supply. Disadvantages are voltage drop and power dissipation.

The TD340 provides support for reversed battery active protection.
An oscillator OSC output is available to allow proper command of a 5th MOS connected upside down.

The MOS must have low threshold voltage

In normal conditions, the MOS intrinsic diode supplies power to the driver at startup. When the TD340 is
started, the OSC output enables the MOS to switch on, providing lower voltage drop and lower power
dissipation.
In caseof reversed battery, the 5th MOS remains off, and no dangerous voltages can reach the driver nor
the power MOS.

The OSC oscillator can only supply a few mA. It must be loaded with a large impedance, typically 100pF
and 680k.

Figure 5 : Reversed Battery Active Protection Principle

because the oscillator output swing is about 6.5V.

Normal Conditions

Vbatt+6V

VbattOsc

1

2
3

TD340

4

VBATT

~Vbatt

2

M

3

REVERSED BATTERY

5

Driver isnot supplied

Vbatt

Osc

1

2
3

TD340

4

GND

MOSFET5
REMAINS
OFF

2

M

3

VBATT

GND

ALLMOSFETSAND DRIVERARE PROTECTED

UVLO and OVLO protections

The TD340 includes protections again overvoltage and undervoltage conditions.
Overvoltage is dangerous for the MOS and for the load due to possible excessive currents and power
dissipation.
Undervoltage is dangerous because MOS driving is no more reliable. MOS could be in linear mode with
high ohmic dissipation.
TD340 Under Voltage LockOut and Over Voltage LockOut features protect the system from no
operational power voltage. UVLO and OVLO thresholds are 6.2V and 20V. Hysteresis provides reliable
behavior near the thresholds.
During UVLO and OVLO, MOS are switched off (TD340 in disable state).

11/21

TD340

Microcontroller support

For easy system integration, the TD340 provides the following functions:

- 5V regulator,

- reset circuit,

- watchdog circuit,

- standby mode,

- temperature indicator.
5V regulator
The TD340 provides a 5V regulated voltage at VOUT pin with amaximum current of 20mAover thewhole

Vbatt range (6.5 to 16V). Current can be up to 40 mA with nominal 12V Vbatt.
It is mandatory to connecta 220nF capacitor to the 5V output, even if the 5V output is not used, because
the 5V is internally used by the device. 220nF is the optimized value for the voltage regulator.

Reset circuit
The integratedsupervisor circuit resets themicro controller as soon as the voltage ofthe Micro Controller

decreases below 4.2V, and until the voltage of the micro controller has not passed above 4.3V.
RESET output is active low. It features an open drain with a internal 75k pull up resistor to internal 5V
which allows hardwired OR configuration.

Figure 6 : Reset Waveforms

Vout

Vthi

Vthd

Vccmin

Vreset

1V

zoom

tph l

t

t

12/21

TD340

Watchdog circuit
An integrated Watchdog circuit resets the microcontroller when a periodic signal coming from the

microcontroller is missing after an externally adjustable Time out delay.
Watchdog timeout is adjustable by means of a capacitor Cwdbetween CWD pin and GND. This capacitor
should be placed as close as possible to the CWD pin.
Watchdog function can be inhibited by tying the CWD pin to ground.

Timeout range is from about 1ms to 1s, approximate value is given by:

Twd = 1 + (20 x Cwd) (Twd in ms, and Cwd in nF).

When the watchdog timeout triggers, the reset output is pulsed once low for 20 microseconds, and the
driver outputs are set to ground (MOS switched off). TD340 stays in disable state (MOS off) until pulses
appear again on WD pin.

Figure 7 : Watchdog waveforms

WDRESET

tip w

twd

treset

t

t

t

H1,H2,L1,L2

Temperature output
The TD340 provides a temperature indicator with the TEMP output.

TEMP voltage is 2.68V at 25°C with a temperature coefficient of -7.5mV/°C.
The goal of this function is to provide a rough temperature indication to the uP. It allows the system
designer to adapt the behavior of the application to the ambient temperature.
The TEMP output must be connected to a high impedance input. Maximum available current is 1uA.

13/21

TD340

Standby mode

The TD340 can be put in standby mode under software control. When the STBY pin is driven low, the
MOS drivers are switched off and internal charge pump oscillator is stopped. The 5V regulator, the
watchdog and reset circuits are still active.
There is no pull up/down resistor on the STBY pin. STBY must not be left open.

Power consumption (not including the current drained from the 5V regulator) is reduced to about 200uA.
To achieve this standby current, the 5.6k resistor on the OSC pin has to be disconnected withan external
low power MOS controlled by the STBY signal (see figure 10 for an application example)

Standby mode should be only activated when IN1=IN2=0V and after that the motor is actually stopped
because thefour MOS are switched off. On exit from the standby mode, a delay of up to 20ms (depending
upon the bootstrap capacitor value) must be given before applying signals to the IN1 and IN2 inputs to
allow proper startup of the charge pump (it is also true for power-up). Figure 8 shows the voltage across
the Cb bootstrap capacitor at powerup or at standby exit as a function of time.

Figure 8 : Charge pump voltage at startup

Fig. 8a : Cb = 10nF

Fig. 8c : Cb = 100nF

Fig. 8b : Cb = 47nF

14/21

TD340

PERFORMANCE CURVES
5V Regulator Voltage vs Output Current

5.1

5.0

Vbatt=16V

4.9

4.8

Vout(V)

4.7
Cout=22 0nF

4.6

4.5

0 102030405060

Vbatt=12V

Vbatt=8V

Vbatt= 6 V

Iout(mA)

Charge Pump Voltage vs Current

40

Vbatt=24 V

Vbatt=16V

Vbatt=12 V

Vcb (V)

35

30

25

20

5V Regulator Voltage vs Vbatt

5.1

5.0

4.9

4.8

Vout(V)

4.7

4.6

4.5
0 5 10 15 20 25

Vba tt (V)

Charge Pump Voltage vs Vbatt

40

35

30

25

ICb=0

Vcb (V)

20

Iload=20mA

Cout=220nF

15

10

Cb=10nF

5

0 20406080100120

Icb(µA)

High Side MOS Static Vgs vs Vbatt

13

12

11

10

Vgs (V)

9

8

7

6 8 10 12 14 16 18 20 22

Vbatt (V)

Vbatt= 6 .5V

15

10

5

5 10152025

ICb=60uA

Cb=10nF

Vbatt(V)

High Side MOS Static Vgs vs Temperature

12

11.5

11

Vgs (V)

10.5

10

-50 0 50 100 15 0
T(°C)

Vbatt=12V

15/21

PERFORMANCE CURVES (continued) Vbatt= 12V, unless otherwise specified

TD340

Supply current

5

4.5

4

Icc (mA)

3.5

3

2.5

-50 0 50 100 150
T(°C)

Reset Threshold (decreasing)

4.4

4.3

4.2

Standby current

350

300

250

Istby(µA)

200

150

100

-50 0 50 100 15 0
T(°C)

Reset Threshold (increasing)

4.4

4.3

4.2

Vthd (V)

4.1

4.0

3.9

-50 0 50 100 150

Under Voltage Lockout

6.5

6.4

6.3

6.2

6.1

UVLO(V)

6.0

5.9

5.8

-50 0 50 100 150

T(°C)

T(°C)

Vthi (V)

4.1

4.0

3.9

-50 0 50 100 150

Over Voltage Lockout

22

21

20

OVLO(V)

19

18

-50 0 50 100 150

T(°C)

T(°C)

16/21

TD340

PERFORMANCE CURVES (continued) Vbatt= 12V, unless otherwise specified
OSC Output Frequency

1.4

1.2

1.0

Fosc (MHz)

0.8

0.6

-50 0 50 100 150
T(°C)

High Side Driver output Current (source)

100

80

Deadtime between High and Low Drivers

3.8

3.6

3.4

no load

3.2

td (µs)

3

2.8

2.6

2.4

-50 0 50 100 150
T(°C)

Low Side Driver output Current (source)

100

80

60

Iouth_src (mA)

40

20

-50 0 50 100 150
T(°C)

High Side Driver output Current (sink)

14 0

12 0

10 0

Iouth_sink(mA)

80

60

-50 0 50 100 150
T(°C)

60

Ioutl_src (mA)

40

20

-50 0 50 100 15 0
T(°C)

Low Side Driver output Current (sink)

140

120

100

Ioutl_sink (mA)

80

60

-50 0 50 10 0 15 0
T(°C)

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TD340

APPLICATION CIRCUIT DIAGRAMS

The following schematics show typical application circuits. The first one is a simple,standalone system,
while the other one is µC driven and includes advanced features like standby mode and reversed battery
active protection.

Simple standalone system

Figure 9 shows a basic use of the TD340. The speed is controlled with a simple adjustable resistor.
Direction is controlled with a switch.

Internal PWM generator is used, frequency is set by the capacitor C3.
Note that the C2 capacitor (220nF) is included because it is needed by the internal TD340 circuit.

Interface lines for microcontroller are not used:
Standby is tied to 5V (Vout),
WD and CWD are tied to ground,
Reset and Temperature outputs are left unconnected.

Reversed battery protection is provided by the means of the diode D2.
Transistors Q1H, Q1L, Q2H, Q2L are to be chosen depending on the motor characteristics.
For example, STP30NE03L are 30V, 30A devices with gate capacitance of about 1nF. For these MOS,
22nF bootstrap capacitors are adequate.

Resistors R1 to R4 are used to control the rise and fall times on the MOS gates, and are also useful to
avoid oscillation of the gate voltage due to the parasitic inductance of lines in conjunction with the gate
capacitance. Typical values for resistors R1 to R4 are from 10 to 100 ohms.

Capacitor C6 is used to store energy and to filter the voltage across the bridge.
Applications:

Small domestic motorized equipments, battery-powered electrical tools, ...

Complete, µC driven system

The next schematic (figure 10) shows a complete system driven by a µC.
The auto-reload timer feature of ST6 µC family is used to easily generate the PWM command signal
(TD340 internal generator is not used, CF pin is connected to ground).

Transil diode D3 can be added as a security to avoid overvoltage transients if the MOS are all driven off
when the motor is running. For example, it can happen if TD340 is put in standby or disable state while
motor is running.

Applications:

- Automotive: advanced window lift systems, wiper systems, ...

- Industrial: battery-powered motor systems, electric door opening, ...

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TD340

Figure 9: Simple Standalone System

.

C6

470uF

+

+12V

Q1H

D1

MOSFET N

Load

Q2H

MOSFET N

C4 22nF

C5 22nF

R1 22

R2 22

Q1L

MOSFET N

GND

Q2L

MOSFET N

R3 22

R4 22

Q1L, Q1H, Q2L, Q2H: STP30NE03L

R5

5.6k

121113

14

15

16

17

18

19

20

Cb1

Osc

TD340

Vbat

Vout

12435

H1

Reset

S1

Cwd

H2

Cb2

Stby

Wd

6

7910

S2

Temp

8

L2

In1

L1

In2

Cf Gnd

U1

C3

270pF

C2

220nF

C1

+

10uF

S1

P1

10k

19/21

Figure 10: Complete, µC Driven System

TD340

+Vbatt

Optionnal

R6

D1

680k

1N4148

Optionnal

Q3

MOSFET NC9

D2

1N4148

100pF

C4 47nF

D3

C6

470uF

+

Q1H

MOSFET N

Q2H

MOSFET N

C5 47nF

R1 100

R2 100

Motor

R3 100

Q1L

MOSFET N

GND

Q2L

MOSFET N

Q4

R4 100

5.6k

R5

BS170

Optionnal

Q3: STP60NE06L

Q1L, Q1H, Q2L, Q2H: STP60NE06

SW1

OPEN

SW2

CLOSE

121113

14151617181920

S1

H1

Cb1

Osc

TD340

Vbat

Vout

Reset

Cwd

12435

C1

10uF

+

Cb2

Stby

Wd

6

XT1

L1

L2S2H2

In1

In2

Temp

7910

8

Cf Gnd

U1

C3

100pF

C2

220nF

C8C7

XT1, C7, C8: see ST6252 datasheet

12111379

10

141516

NMI

PC3

PC2

ST6252

PB0

12435

Vpp/Test

PB2

Reset

PB3

OSCin

OSCout

PB7

PB6

6

PA5

Vdd

U2

Vss PA4

8

20/21

TD340

PACKAGE MECHANICAL DATA

20 PINS - PLASTIC MICROPACKAGE (SO)

Dim.

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

a1 0.254 0.010

B 1.39 1.65 0.055 0.065
b 0.45 0.018

b1 0.25 0.010

D 25.4 1.000

E 8.5 0.335
e 2.54 0.100

e3 22.86 0.900

F 7.1 0.280

I 3.93 0.155
L 3.3 0.130
Z 1.34 0.053

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life suppo rt devices or
systems withoutexpress written approval of STMicroelectronics.

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