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TD340
H-BRIDGE QUAD POWER MOSFET DRIVER FOR DC MOTOR CONTROL
PRELIMINARY DATA
s QUAD N-CHANNEL MOSFET DRIVE s INTEGRATED CHARGE PUMP FOR HIGH
SIDE MOSFET DRIVING
s VERY LOW GROUND EMI NOISE s MOTOR SPEED AND DIRECTION CONTROL (LOW SIDE PWM)
s INTERNAL OR EXTERNAL PWM SOURCE s 25kHz SWITCHING FREQUENCY ABILITY s SYNCHRONOUS HIGH SIDE RECTIFICATION
s REVERSED BATTERY ACTIVE PROTECTION ABILITY
D SO20 (Plastic Micropackage)
s INTEGRATED 5V POWER SUPPLY FOR
MICROCONTROLLER
s INTEGRATED SECURITY CIRCUITS:
UVLO, OVLO, WATCHDOG
s 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 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
ORDER CODE
Package Part Number TD340ID Temperature Range -40C, +125C D *
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
VBATT VOUT RESET CWD WD STBY TEMP IN1 IN2 CF
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
OSC CB1 H1 S1 CB2 H2 S2 L2 L1 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 VOUT RESET
RESET
SUPPLY UVLO OVLO
OSC CB1 H1
CWD CONTROLLER WD STBY TEMP IN1 IN2 CF 0V T
WATCHDOG
S1 CB2
PWM LOGIC
H2 S2 L2 L1
Q2H M Q2L
Q1H
PWM
Q1L
TD340
GND BATT -
PIN DESCRIPTION
Name VBATT GND L1 L2 H1 H2 S1 S2 CB1 CB2 CF IN1 IN2 STBY TEMP VOUT RESET WD CWD OSC Pin 1 11 12 13 18 15 17 17 19 16 10 8 9 6 7 2 3 5 4 20 Type 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 Function
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 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 icrocontroller External Capacitor to set Watchdog Timeout Oscillator Output
Digital Input Digital Input Analog Output Power Output Open Drain Output Digital Input Analog Input Digital Output
2/21
TD340
ABSOLUTE MAXIMUM RATINGS
Symbol VBatt Pd Tstg ESD Vdigital Vlowgate Vpower Vosc Tj Rhja Parameter Positive Supply Voltage - Note 1 Power Dissipation Storage Temperature Electrostatic Discharge Voltage on pins: IN1, IN2, STBY, WD, CWD, CF, TEMP, VOUT, RESET Voltage on pins: L1, L2 Voltage on pins: H1, H2, S1, S2, CB1, CB2 - Note 2 Voltage on pin OSC Maximum Junction Temperature Thermal Resistance Junction-Ambient Value 60 500 -55 to +150 2 -0.3 to 7 -0.3 to 15 -0.3 to 60 Vbatt-6.5 to Vbatt 150 85 Unit V mW
o
C kV V V V V
C 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 Vbatt Toper Positive Supply Voltage Operating Free Air Temperature Range Parameter Value 6.5 to 18.5 -40 to +125 Unit V C
3/21
TD340
ELECTRICAL CHARACTERISTICS Vbatt= 12V, Tamb=-40C to 125C (unless otherwise specified)
Symbol ICC Istdby Parameter Total Supply Current Tmin. < Tamb < Tmax. Supply Current in Standby Mode Test Condition T=25C -40C < T < 125C T=25C -40C < T < 125C 0.8 2 Vbatt Hyst. Vbatt Hyst. decreasing = 100mV typ. decreasing = 300mV 5.8 18.5 6.2 20 6.5 21.5 Min. Typ. 4.5 5 180 Max. 7 10 300 350 Unit mA mA A A V V V V
StandbyH STDBY Pin Voltage for Standby OFF StandbyL STDBY Pin Voltage for Standby ON UVLO OVLO Under Voltage Lockout - when VbattOVLO all buffer outputs are low
DRIVERS - Cbootstrap=47nF
Vgs Vgsd Freq td Static Gate-Source High Side Mosfet VoltNo Bootstrap Cap age (charge pump) Dynamic Gate-Source High Side Mosfet Voltage (bootstrap) Switching Frequency of PWM Dead Time for secure Synchronous Rectification Output Current Capability - Low Side Source Ioutl Sink Output Current Capability - High Side Source Iouth Sink 8 11 9 Cf = 270pF Cf=270nF, IN1=2.4V No Load Cload=4nF T=25C 40C < T < 125C T=25C 40C < T < 125C T=25C 40C < T < 125C T=25C 40C < T < 125C T=25C 40C < T < 125C Vbatt = 12V Vbatt = 9V Vbatt > UVLO 20 2.1 25 2.8 1.5 50 50 100 100 50 50 100 100 1 1 30 3.5 15 V V kHz s s mA mA mA mA mA mA mA mA MHz MHz V V V
30 25 60 50 30 25 60 50 0.6 0.5 6.25 6.25 5.1
100 100 150 150 100 100 150 150 1.4 1.5 12 12 12.5
OSCILLATOR - Rosc=5.6k - Note 1
Fosc Vosc Frequency of internal Step up converter Oscillator Oscillator Swing - note 7
4/21
TD340
ELECTRICAL CHARACTERISTICS (continued) Vbatt= 12V, Tamb=-40C to 125C (unless otherwise specified)
Symbol Parameter Test Conditio n Io=20mA T=25C 40C < T < 125C 6V < Vbatt < 16V, Io=20mA T=25C 40C < T < 125C 0 Io 40mA T=25C 40C < T < 125C Vbatt = 12V 6V < Vbatt < 16V Vout=0 T=25C 40C < T < 125C T=25C 40C < T < 125C 4.0 3.9 3.9 3.8 Min. Typ. Max. Unit
VOLTAGE REGULATOR - Co=220nF - note 2
Vout Line Reg Load Reg Io Ios Output Voltage 4.6 4.5 5 5 5.4 5.5 100 150 20 40 40 20 100 4.3 4.2 0.86 0.84 50 100 5 No ext. capacitor Cwd = 47nF - note 4 0.5 0.7 0.1 0.1 10 T= 25 oC 2.58 -7 20 2.68 -7.5 40 2.78 -7.8 1 1 2 1.5 200 mV s ms s s s s V
mV/o C
V V mV mV mV mV mA mA mA V V V V
Line Regulation
Load Regulation Maximum Output Current Output Current Short Circuit
200 4.5 4.6 4.4 4.5
RESET SUPERVISORY CIRCUIT - note 3
Vthi V thd ki kd Vhys tphl Threshold Voltage Vout Increasing Threshold Voltage Vout Decreasing Linearity coefficient (Vthi = ki Vout) Linearity coefficient (Vthd = kd Vout) Hysteresis Threshold Voltage Response Time High to Low
WATCHDOG CIRCUIT
twd tipw t ipr treset VT VT Watchdog Time Out Period Watchdog Input Pulse Width for Proper Retrigger Watchdog Input Rise Time for Proper Retrigger Reset Pulse Width Output Voltage Output Temperature Drift
TEMPERATURE OUTPUT
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.
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CONTROLLER
CF
3.6V
INTERNAL ELECTRICAL SCHEMATIC AND APPLICATION ENVIRONMENT
0V
-
IN2
+
6/21
BATT + VBATT UVLO / OVLO 5V REGULATOR RESET S1 WATCHDOG OSC STBY STBY T IN1 filter 1.2V
+ -
OSC CB1 H1
5V VOUT RESET CWD WD CB2
TD340
H2 S2 L2 L1 GND
Q2H
A -
Q1H
+
TEMP
M Q2L
Q1L
BATT -
TD340
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
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TD340
Figure 2 : PWM Analog and Digital Modes
Vbatt
TD340 P 5V IN1 0V PWM PWM 0V CF CF
M
Vbatt
TD340 P 5V IN1 PWM PWM
M
ANALOG INPUT + CF (270pF)
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.
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TD340
Figure 3 : Synchronous Rectification Principle
ex1: Speed: PWM=x% No synchronous rectification
ex2: Speed: PWM=x% With synchronous rectification - TD340
1-x% FULL OFF
1-x%
FULL ON
PWM
M
x%
M
PWM
x%
FULL ON
PWM
FULL OFF
FULL OFF
HIGH DISSIPATION THROUGH FREE WHEEL DIODE!
LOW DISSIPATION THROUGH LOW Rdson!
Table 1 : Function Table in Digital and Analog Modes
IN1 (V) Stby Disable State State digital 1 X 0 0 0 0 0 0 X 1 0 0 0 0 0 0 X X 0 idle 0 idle PWM PWM 5 idle 5 idle analog X X 0 to 1.2 0 to 1.2 1.2 to 3.6 1.2 to 3.6 3.6 to 5 3.6 to 5 X X 0 5 0 5 0 5 IN2 (V) Q1L OFF OFF ON OFF OFF PWM OFF ON
Mosfets Status Comments Q1H OFF OFF OFF ON ON !PWM ON OFF Q2L OFF OFF ON OFF PWM OFF ON OFF Q2H OFF OFF OFF ON !PWM ON OFF ON Motor Off in Standby Mode Motor Off in Disable Mode Motor Brake Low Motor Brake High Motor x% Forward Motor x% Backward Motor 100% Forward 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.
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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
VBATT
REVERSED BATTERY
5
GND
MOSFET 5 REMAINS OFF
Vbatt+6V ~Vbatt Osc Vbatt 1 2 3 2
Driver is not supplied Osc Vbatt 1 2 3 3
2
M TD340
M
3
TD340
4
4
GND
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).
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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. Figure 7 : Watchdog waveforms
WD
t
RESET
tipw
tw d
treset t
H1,H2,L1,L2
t
Temperature output The TD340 provides a temperature indicator with the TEMP output. TEMP voltage is 2.68V at 25C 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.
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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. 8b : Cb = 47nF
Fig. 8c : Cb = 100nF
14/21
TD340
PERFORMANCE CURVES 5V Regulator Voltage vs Output Current
5.1 Vbatt=16V 5.0 Vbatt=12V Vbatt=8V 4.9 Vout (V)
Vout (V) 4.9 5.0
5V Regulator Voltage vs Vbatt
5.1
4.8 Vbatt=6V 4.7 Cout=220nF 4.6 4.5 0 10 20 30 Iout (m A) 40 50 60
4.8
4.7
Iload=20mA Cout=220nF
4.6
4.5 0 5 10 Vbatt (V) 15 20 25
Charge Pump Voltage vs Current
40 35 30 Vbatt=16V Vcb (V) Vbatt=24V
Charge Pump Voltage vs Vbatt
40 35 30 Vcb (V) 25 ICb=0 20 15 ICb=60uA Vbatt=6.5V 10 5 Cb=10nF
25 20 15 10 Cb=10nF 5 0 20 40 60 Icb (A) 80 100 120 Vbatt=12V
5
10
15 Vbatt(V)
20
25
High Side MOS Static Vgs vs Vbatt
13
High Side MOS Static Vgs vs Temperature
12
12
11.5
11 Vgs (V) 10 9
10.5 Vgs (V) Vbatt=12V 11
8
7 6 8 10 12 14 Vbatt(V) 16 18 20 22
10 -50 0 50 T (C) 100 150
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TD340
PERFORMANCE CURVES (continued) Vbatt= 12V, unless otherwise specified Supply current
5
Standby current
350
4.5
300
3.5
Istby (A)
Icc (mA)
4
250
200
3
150
2.5 -50 0 50 T (C) 100 150
100 -50 0 50 T(C) 100 150
Reset Threshold (decreasing)
4.4
Reset Threshold (increasing)
4.4
4.3
4.3
Vthd (V)
4.1
Vthi (V) -50 0 50 T (C) 100 150
4.2
4.2
4.1
4.0
4.0
3.9
3.9 -50 0 50 T (C) 100 150
Under Voltage Lockout
6.5 6.4 6.3 UVLO (V) 6.2 6.1 6.0 5.9 5.8 -50 0 50 T (C) 100 150
Over Voltage Lockout
22
21
OVLO (V)
20
19
18 -50 0 50 T(C) 100 150
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TD340
PERFORMANCE CURVES (continued) Vbatt= 12V, unless otherwise specified OSC Output Frequency
1.4
3.6
Deadtime between High and Low Drivers
3.8
1.2 Fosc (MHz)
3.4
no load
1.0
td (s)
3.2 3 2.8 2.6 2.4
0.8
0.6
-50
0
50 T (C)
100
150
-50
0
50 T (C)
100
150
High Side Driver output Current (source)
100
Low Side Driver output Current (source)
100
80 Iouth_src (mA)
80 Ioutl_src (mA)
60
60
40
40
20 -50 0 50 T (C) 100 150
20 -50 0 50 T(C) 100 150
High Side Driver output Current (sink)
140
Low Side Driver output Current (sink)
140
120 Iouth_sink (mA) Ioutl_sink (mA)
120
100
100
80
80
60
60
-50
0
50 T (C)
100
150
-50
0
50 T (C)
100
150
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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 C 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, C driven system The next schematic (figure 10) shows a complete system driven by a C. The auto-reload timer feature of ST6 C 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
+12V
Figure 9: Simple Standalone System
D1
TD340
R1 Q2H MOSFET N C5 R2 22 22nF 22
C4
22nF Q1H MOSFET N
P1
10k R3 R4 22 22
Load
+ C6 Q2L MOSFET N Q1L MOSFET N 470uF
S1 U1 R5 5.6k
1 2 3 4 5 6 7 8 9 10 Vbat Vout Reset Cwd Wd Stby Temp In1 In2 Cf
Osc 20 19 Cb1 18 H1 17 S1 16 Cb2 15 H2 14 S2 13 L2 12 L1 11 Gnd
+ C1 C2 220nF C3 270pF
10uF
Q1L, Q1H, Q2L, Q2H: STP30NE03L
.
GND
19/21
20/21
+Vbatt
Optionnal
D1 1N4148 R6 680k D2 Q3 MOSFET N C9 100pF 1N4148
SW1
OPEN
SW2
Figure 10: Complete, C Driven System
CLOSE
+ C1 10uF
ST6252 TD340
R1 Q2H C5 R2 100 47nF MOSFET N 100
C4
47nF Optionnal Q1H MOSFET N D3
XT1 R3 R4 R5 5.6k 100 Q2L 100
1 2 3 4 5 6 7 8
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
U2 U1 C2 220nF C3 100pF
1 2 3 4 5 6 7 8 9 10
Motor
+ Q1L MOSFET N MOSFET N C6 470uF
Vbat Vout Reset Cwd Wd Stby Temp In1 In2 Cf
Osc 20 19 Cb1 18 H1 17 S1 16 Cb2 15 H2 14 S2 13 L2 12 L1 11 Gnd
C7
C8
Q4 BS170
Optionnal
XT1, C7, C8: see ST6252 datasheet Q1L, Q1H, Q2L, Q2H: STP60NE06 Q3: STP60NE06L
GND
TD340
TD340
PACKAGE MECHANICAL DATA 20 PINS - PLASTIC MICROPACKAGE (SO)
Millimeters Dim. Min. a1 B b b1 D E e e3 F I L Z 0.254 1.39 0.45 0.25 25.4 8.5 2.54 22.86 7.1 3.93 3.3 1.34 Typ. Max. 1.65 Min. 0.010 0.055
Inches Typ. Max. 0.065 0.018 0.010 1.000 0.335 0.100 0.900 0.280 0.155 0.130 0.053
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