STMICROELECTRONICS TD340ID

TD340
H-BRIDGE QUAD POWER MOSFET DRIVER
FOR DC MOTOR CONTROL
PRELIMINARY DATA
■ QUAD N-CHANNEL MOSFET DRIVE
■ INTEGRATED CHARGE PUMP FOR HIGH
SIDE MOSFET DRIVING
■ VERY LOW GROUND EMI NOISE
■ MOTOR SPEED AND DIRECTION CONTROL (LOW SIDE PWM)
■ INTERNAL OR EXTERNAL PWM SOURCE
■ 25kHz SWITCHING FREQUENCY ABILITY
■ SYNCHRONOUS HIGH SIDE RECTIFICAD
SO20
(Plastic Micropackage)
TION
■ REVERSED BATTERY ACTIVE PROTECTION ABILITY
■ INTEGRATED 5V POWER SUPPLY FOR
MICROCONTROLLER
■ INTEGRATED SECURITY CIRCUITS:
UVLO, OVLO, WATCHDOG
■ 60V MAX RATING
ORDER CODE
Package
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 speed and direction of the motor are to be set
by two pins. Voltage across the motor is controlled
by low side Pulse Width Modulation (PWM). This
PWM feature can be made internally when the
input pin is connected to an analog signal, or it can
be given directly from a digital source.
An internal charge pump allows proper upper
MOS driving for full static 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 for the
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.
May 2000
Part Number
Temperature Range
TD340ID
D
•
-40°C, +125°C
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
VBATT
1
20
OSC
VOUT
2
19
CB1
RESET
3
18
H1
CWD
4
17
S1
WD
5
16
CB2
STBY
6
15
H2
TEMP
7
14
S2
IN1
8
13
L2
IN2
9
12
L1
CF
10
11
GND
1/21
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TD340
SYSTEM AND INTERNAL BLOCK DIAGRAM
BATT +
VBATT
5V
OSC
SUPPLY
UVLO
OVLO
VOUT
CB1
RESET
H1
RESET
µCONTROLLER
CWD
WATCHDOG
WD
CB2
STBY
TEMP
S1
PWM
T°
Q2H
PWM
IN2
L2
Q1H
M
S2
LOGIC
IN1
H2
Q2L
Q1L
L1
CF
TD340
GND
0V
BATT -
PIN DESCRIPTION
Name
Pin
VBATT
GND
L1
L2
H1
H2
S1
S2
CB1
CB2
CF
1
11
12
13
18
15
17
17
19
16
10
IN1
8
IN2
STBY
TEMP
VOUT
RESET
WD
CWD
OSC
9
6
7
2
3
5
4
20
2/21
Type
Function
Power Input
Ground
Push Pull Output
Push Pull Output
Push Pull Output
Push Pull Output
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Power Supply
Ground
Low Side Drive - Gate 1
Low Side Drive - Gate 2
High Side Drive - Gate 1
High Side Drive - Gate 2
High Side Drive - Source 1
High Side Drive - Source 2
High Side Drive - Bootstrap Capacitor 1
High Side Drive - Bootstrap Capacitor 2
External Capacitor to set the PWM Switching Frequency
Analog Level of PWM (0 to 100%) if CF connected to a capacitor,
Analog or Digital Input
or PWM Signal if CF connected to ground
Digital Input
Digital Input
Analog Output
Power Output
Open Drain Output
Digital Input
Analog Input
Digital Output
Direction to the Motor’s Rotation
Standby Mode
Analog Indicator of Temperature
Regulated Power Supply Output for the Microcontroller - 5V
Reset Signal for the Microcontroller
Watchdog Signal from the Μicrocontroller
External Capacitor to set Watchdog Timeout
Oscillator Output
TD340
ABSOLUTE MAXIMUM RATINGS
Symbol
VBatt
Parameter
Positive Supply Voltage - Note 1
Pd
Power Dissipation
Tstg
Storage Temperature
ESD
Electrostatic Discharge
Voltage on pins: IN1, IN2, STBY, WD, CWD, CF, TEMP, VOUT,
RESET
Vdigital
Value
Unit
60
V
500
mW
-55 to +150
o
2
C
kV
-0.3 to 7
V
Vlowgate
Voltage on pins: L1, L2
-0.3 to 15
V
Vpower
Voltage on pins: H1, H2, S1, S2, CB1, CB2 - Note 2
-0.3 to 60
V
Vosc
Tj
Rhja
Voltage on pin OSC
Vbatt-6.5 to Vbatt
V
Maximum Junction Temperature
150
°C
Thermal Resistance Junction-Ambient
85
°C/W
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 limi ted 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
Symbol
Parameter
Value
Unit
Vbatt
Positive Supply Voltage
6.5 to 18.5
V
Toper
Operating Free Air Temperature Range
-40 to +125
°C
3/21
TD340
ELECTRICAL CHARACTERISTICS
Vbatt= 12V, Tamb=-40°C to 125°C (unless otherwise specified)
Symbol
ICC
Istdby
Parameter
Total Supply Current
Tmin. < Tamb < Tmax.
Supply Current in Standby Mode
Test Condition
Typ.
Max.
Unit
T=25°C
-40°C < T < 125°C
4.5
5
7
10
mA
mA
T=25°C
-40°C < T < 125°C
180
300
350
µA
µA
StandbyH STDBY Pin Voltage for Standby OFF
Min.
0.8
V
StandbyL STDBY Pin Voltage for Standby ON
UVLO
OVLO
Under Voltage Lockout - when
Vbatt<UVLO all buffer outputs are low
Under Voltage Lockout - when
Vbatt>OVLO all buffer outputs are low
Vbatt
Hyst.
Vbatt
Hyst.
decreasing
= 100mV typ.
decreasing
= 300mV
2
V
5.8
6.2
6.5
V
18.5
20
21.5
V
8
11
15
V
DRIVERS - Cbootstrap=47nF
Vgs
Static Gate-Source High Side Mosfet VoltNo Bootstrap Cap
age (charge pump)
Vgsd
Dynamic Gate-Source High Side Mosfet
Voltage (bootstrap)
Switching Frequency of PWM
Freq
td
Dead Time for secure Synchronous
Rectification
Output Current Capability - Low Side
Source
Ioutl
Sink
Output Current Capability - High Side
Source
Iouth
Sink
9
Cf = 270pF
Cf=270nF, IN1=2.4V
No Load
Cload=4nF
V
20
25
30
kHz
2.1
2.8
1.5
3.5
µs
µs
T=25°C
40°C < T < 125°C
T=25°C
40°C < T < 125°C
30
25
60
50
50
50
100
100
100
100
150
150
mA
mA
mA
mA
T=25°C
40°C < T < 125°C
T=25°C
40°C < T < 125°C
30
25
60
50
50
50
100
100
100
100
150
150
mA
mA
mA
mA
T=25°C
40°C < T < 125°C
Vbatt = 12V
Vbatt = 9V
0.6
0.5
1
1
1.4
1.5
MHz
MHz
12
12
12.5
V
V
V
OSCILLATOR - Rosc=5.6k - Note 1
Fosc
Frequency of internal Step up converter
Oscillator
Vosc
Oscillator Swing - note 7
Vbatt > UVLO
4/21
6.25
6.25
5.1
TD340
ELECTRICAL CHARACTERISTICS (continued)
Vbatt= 12V, Tamb=-40°C to 125°C (unless otherwise specified)
Symbol
Parameter
Test Conditio n
Min.
Typ.
Max.
Unit
4.6
4.5
5
5
5.4
5.5
V
V
100
150
mV
mV
20
40
mV
mV
mA
mA
100
200
mA
4.3
4.5
4.6
4.4
4.5
V
V
V
V
200
mV
VOLTAGE REGULATOR - Co=220nF - note 2
Vout
Output Voltage
Line
Reg
Line Regulation
Load
Reg
Load Regulation
Io
Maximum Output Current
Ios
Output Current Short Circuit
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
40
20
Vout=0
RESET SUPERVISORY CIRCUIT - note 3
Vthi
Threshold Voltage Vout Increasing
V thd
Threshold Voltage Vout Decreasing
ki
Linearity coefficient (Vthi = ki Vout)
kd
Linearity coefficient (Vthd = kd Vout)
Vhys
Hysteresis Threshold Voltage
tphl
Response Time High to Low
T=25°C
40°C < T < 125°C
T=25°C
40°C < T < 125°C
4.0
3.9
3.9
3.8
4.2
0.86
0.84
50
100
µs
5
WATCHDOG CIRCUIT
twd
Watchdog Time Out Period
tipw
Watchdog Input Pulse Width for Proper
Retrigger
Watchdog Input Rise Time for Proper
Retrigger
t ipr
treset
No ext. capacitor
Cwd = 47nF - note 4
0.5
0.7
1
1
2
1.5
µs
0.1
Reset Pulse Width
ms
s
0.1
µs
10
20
40
µs
2.58
2.68
2.78
V
-7
-7.5
-7.8
mV/o C
TEMPERATURE OUTPUT
VT
Output Voltage
∆VT
Output Temperature Drift
T= 25 oC
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 ki and 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.
5/21
CF
IN2
IN1
TEMP
STBY
WD
CWD
RESET
VOUT
T°
STBY
1.2V
WATCHDOG
RESET
5V REGULATOR
3.6V
+
-
filter
TD340
OSC
GND
L1
L2
S2
H2
CB2
S1
H1
CB1
OSC
Q2H
Q2L
-
0V
µCONTROLLER
5V
UVLO / OVLO
M
Q1H
BATT -
Q1L
+
-
6/21
+
VBATT
BATT +
TD340
INTERNAL ELECTRICAL SCHEMATIC AND APPLICATION ENVIRONMENT
A
TD340
FUNCTIONAL DESCRIPTION
Speed and Direction Control:
The TD340 IC provides the necessary interface between an H-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%
Voltage
0%
1.2V
3.6V
IN1
7/21
TD340
Figure 2 : PWM Analog and Digital Modes
Vbatt
Vbatt
TD340
TD340
µP
µP
5V
IN1
0V
5V
M
M
IN1
PWM
PWM
PWM
PWM
0V
CF
ANALOG INPUT
+ CF (270pF)
CF
PWM OUTPUT
DIGITAL INPUT
+ CF GROUNDED
PWM OUTPUT
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 the MOS is switched off, current can not instantaneously drop to 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 MOS are switched, a deadtime is inserted between the opening of one MOS, and the closing of
the other one. In the TD340 device, the deadtime is fixed to about 2.5 microseconds. This value 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 of the 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 synchronous rectification
ex2:
Speed: PWM=x%
With synchronous rectification - TD340
1-x%
1-x%
FULL
OFF
M
x%
PWM
FULL
ON
PWM
FULL
OFF
PWM
FULL
ON
M
x%
FULL
OFF
LOW DISSIPATION
THROUGH LOW Rdson!
HIGH DISSIPATION
THROUGH FREE WHEEL DIODE!
Table 1 : Function Table in Digital and Analog Modes
IN1 (V)
Mosfets Status
Stby Disable
State State
IN2
(V)
digital
analog
Comments
Q1L
Q1H
Q2L
Q2H
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 gate input is recommended to prevent spurious oscillations due to parasitic inductance in conjunction
with gate capacitance. Typical value of these resistors are from 10 to 100 ohms, depending on the MOS
characteristics.
Charge pump
To drive the high side MOS, the TD340 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 capacitors are charged from Vbat when the lower MOS is ON. When the lower MOS is switched
off and the upper one is switched ON, the bootstrap capacitor provides the necessary 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 because the oscillator output swing is about 6.5V.
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 case of 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
Normal Conditions
REVERSED BATTERY
VBATT
GND
MOSFET 5
REMAINS
OFF
5
Vbatt+6V
Driver is not supplied
~Vbatt
Osc Vbatt
Osc Vbatt
2
2
M
M
3
3
TD340
2
1
2
1
4
3
GND
TD340
3
4
VBATT
ALL MOSFETS AND DRIVER ARE 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 a maximum current of 20mA over the whole
Vbatt range (6.5 to 16V). Current can be up to 40 mA with nominal 12V Vbatt.
It is mandatory to connect a 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 integrated supervisor circuit resets the micro controller as soon as the voltage of the 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
V ou t
V th i
V th d
V c c m in
Vre set
zo om
t
tp h l
1V
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 Cwd between 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.
H1,H2,L1,L2
RESET
WD
Figure 7 : Watchdog waveforms
t
tipw
tw d
treset
t
t
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 with an 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 the four 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
14/21
Fig. 8b : Cb = 47nF
TD340
PERFORMANCE CURVES
5V Regulator Voltage vs Output Current
5V Regulator Voltage vs Vbatt
5.1
5.1
Vbatt=16V
Vbatt=12V
5.0
5.0
Vbatt=8V
4.9
Vout (V)
Vout (V)
4.9
4.8
Vbatt=6V
4.7
4.8
Iload=20mA
Cout=220nF
4.7
Cout=220nF
4.6
4.6
4.5
4.5
0
10
20
30
40
50
60
0
5
10
15
20
25
Vbatt (V)
Iout (mA)
Charge Pump Voltage vs Current
Charge Pump Voltage vs Vbatt
40
40
Vbatt=24V
35
35
30
30
25
Vcb (V)
Vcb (V)
Vbatt=16V
Vbatt=12V
20
15
25
ICb=0
20
15
ICb=60uA
Vbatt=6.5V
10
Cb=10nF
10
Cb=10nF
5
5
0
20
40
60
80
100
120
5
10
15
Icb (µA)
20
25
Vbatt(V)
High Side MOS Static Vgs vs Vbatt
High Side MOS Static Vgs vs Temperature
13
12
12
11.5
Vgs (V)
Vgs (V)
11
10
Vbatt=12V
11
9
10.5
8
7
10
6
8
10
12
14
Vbatt(V)
16
18
20
22
-50
0
50
100
150
T (°C)
15/21
TD340
PERFORMANCE CURVES (continued) Vbatt= 12V, unless otherwise specified
Standby current
5
350
4.5
300
4
250
Istby (µA)
Icc (mA)
Supply current
3.5
3
200
150
2.5
100
-50
0
50
100
-50
150
0
Reset Threshold (decreasing)
100
150
100
150
100
150
Reset Threshold (increasing)
4.4
4.4
4.3
4.3
4.2
4.2
Vthi (V)
Vthd (V)
50
T(°C)
T (°C)
4.1
4.1
4.0
4.0
3.9
3.9
-50
0
50
100
150
-50
0
T (°C)
50
T (°C)
Under Voltage Lockout
Over Voltage Lockout
6.5
22
6.4
21
OVLO (V)
UVLO (V)
6.3
6.2
6.1
6.0
20
19
5.9
5.8
18
-50
0
50
T (°C)
16/21
100
150
-50
0
50
T(°C)
TD340
PERFORMANCE CURVES (continued) Vbatt= 12V, unless otherwise specified
OSC Output Frequency
Deadtime between High and Low Drivers
3.8
1.4
3.6
3.4
no load
td (µs)
Fosc (MHz)
1.2
1.0
0.8
3.2
3
2.8
2.6
0.6
2.4
-50
0
50
100
150
-50
0
T (°C)
100
150
Low Side Driver output Current (source)
100
100
80
80
Ioutl_src (mA)
Iouth_src (mA)
High Side Driver output Current (source)
60
40
60
40
20
20
-50
0
50
100
-50
150
0
High Side Driver output Current (sink)
120
120
Ioutl_sink (mA)
140
100
80
60
60
50
T (°C)
150
100
80
0
100
Low Side Driver output Current (sink)
140
-50
50
T(°C)
T (°C)
Iouth_sink (mA)
50
T (°C)
100
150
-50
0
50
100
150
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, ...
18/21
10k
P1
S1
10uF
+ C1
C2
220nF
U1
Osc 20
19
Cb1
18
H1
17
S1
16
Cb2
15
H2
14
S2
13
L2
12
L1
11
Gnd
TD340
Vbat
Vout
Reset
Cwd
Wd
Stby
Temp
In1
In2
Cf
C3
270pF
1
2
3
4
5
6
7
8
9
10
R5
5.6k
22nF
22
22
Load
Q1L
MOSFET N
Q1H
MOSFET N
GND
Q2L
MOSFET N
Q2H
MOSFET N
Q1L, Q1H, Q2L, Q2H: STP30NE03L
R4
R3
22
C5
R2
22nF
22
C4
R1
D1
+12V
470uF
+ C6
TD340
Figure 9: Simple Standalone System
.
19/21
20/21
1
2
3
4
5
6
7
8
U2
PC2 16
PB0
15
Vpp/Test PC3
14
PB2
NMI
13
Reset
PB3
12
PB6 OSCout 11
PB7
OSCin
10
PA5
Vdd
9
Vss
PA4
ST6252
SW2
SW1
C8
C2
220nF
XT1, C7, C8: see ST6252 datasheet
C7
XT1
CLOSE
OPEN
+
C3
100pF
C1
10uF
1
2
3
4
5
6
7
8
9
10
U1
Osc 20
19
Cb1
18
H1
17
S1
16
Cb2
15
H2
14
S2
13
L2
12
L1
11
Gnd
TD340
Vbat
Vout
Reset
Cwd
Wd
Stby
Temp
In1
In2
Cf
R5
5.6k
Q4
BS170
100
1N4148
D2
Q3: STP60NE06L
Motor
MOSFET N
Q1L
MOSFET N
Q1H
MOSFET N
Q3
GND
MOSFET N
Q2L
MOSFET N
Q2H
R6
680k
Q1L, Q1H, Q2L, Q2H: STP60NE06
Optionnal
R4
100
47nF
100
C5
R2
R3
47nF
100
C4
R1
C9
100pF
D1
1N4148
Optionnal
+Vbatt
+
C6
470uF
D3
Optionnal
TD340
Figure 10: Complete, µC Driven System
TD340
PACKAGE MECHANICAL DATA
20 PINS - PLASTIC MICROPACKAGE (SO)
Millimeters
Inches
Dim.
Min.
a1
B
b
b1
D
E
e
e3
F
I
L
Z
Typ.
0.254
1.39
Max.
Min.
1.65
0.010
0.055
0.45
0.25
Typ.
Max.
0.065
0.018
0.010
25.4
8.5
2.54
22.86
1.000
0.335
0.100
0.900
7.1
3.93
3.3
0.280
0.155
0.130
1.34
0.053
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibil ity for the
consequences of use of such information nor for any infring ement of patents or other righ ts 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 witho ut notice. This publ ication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life suppo rt devices or
systems withou t express written approval of STMicroelectronics.
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