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Features
* * * * * * * * *
Push-pull Output Stage for 4 A Peak Current Low Rdson < 2 12 V Push-pull Output Stage for Pulse Shaping Super Short Propagation Delay Input-output 50 ns Super Fast Rise/Fall Time of Output Stage 12 ns Monitoring Circuit with 60 ns Switch-off Delay and 20 ms Lockout Undervoltage Lockout 40 ms Wide Supply Voltage Range from16 V up to 30 V Fully Integrated Charge Pump
High Speed Power Driver IC ATA6821
Electrostatic sensitive device. Observe precautions for handling.
Description
The ATA6821 is a single-channel high-speed power driver IC designed with Atmel's 0.8 m BCDMOS technology. With its extremly short propagation delay and super fast slew rates, the ATA6821 is ideally suited to control MOSFETs or IGBTs in a wide range of automotive and industrial high-speed applications. The push-pull output stage is capable of driving peak currents of 4 A. The ATA6821 is designed to control high currents as they can be found in electrical machines or in power converters. The ATA6821 is tailored to control low resistance switching devices by a potential-free input signal. The ATA6821's full automotive qualification, ESD protection and protection against transients according to ISO/TR 7637/1 guarantees security for all kind of applications.
Rev. 4778A-AUTO-11/03
Figure 1. Block Diagram
VS
Voltage Monitoring
Monoflop Monoflop 1/3 VS 40 ms 20 ms 70K
Undervoltage Detection
MONITOR 3
12 V FEED 8
7 V/ 4V
Charge Pump Control Logic
Push Pull Output Stage VS 1, 2
9
15K Pulse Shaping
OUTPUT 13, 14
MeasureLogic
TestLogic
PGND 11, 12
GND
10
MEAS
5
TEST
7
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Pin Configuration
Figure 2. Pinning SO14
VS VS MONITOR NC MEAS NC TEST 1 2 3 4 5 6 7 14 13 12 11 10 9 8 OUTPUT OUTPUT PGND PGND GND INPUT FEED
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Note: Symbol VS VS MONITOR NC MEAS NC TEST FEED INPUT GND PGND PGND OUTPUT OUTPUT Function Supply voltage Supply voltage Voltage monitoring input Not connected Measurement pin Not connected Test pin Feed output Input Ground(1) Power ground(1) Power ground(1) Output Output
1. All ground pins must be connected together by short external connections. The measurement pin (pin 5) and the test pin (pin 7) must be connected to the ground pins.
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Functional Description
The ATA6821 controls a push-pull power output stage for an external power device and a feedback output stage. If the voltage at the input pin is > 7 V, both outputs are at "high-level", if the input voltage falls below the switch-off threshold of 4 V, both outputs are switched to ground. If a rectangular input signal is fed to the input, the feedback ouput "Feed" is not used and pin 8 needs no external connection. In case the input signal, however, comes from a transformer (potential-free control; see Figure 7 on page 11), the integrated pulse shaping circuit is used to achieve a reliable feedback configuration at the input. This ensures correct switching of the output stage even if the input signal is very noisy. For the timing of input and output signals and the slew rates, please refer to Figure 3 on page 8. The timing diagram is based on the following test conditions: A 2 kW resistor is connected between pin 8 and ground; a 2 kW resistor and a 1 nF capacitor are used as load for the power output (pins 13 and 14) simulating identical conditions as a power MOSFET, which is usually connected to the output.
Undervoltage Detection
During power-up and power-down of the supply voltage, the internal undervoltage circuit suppresses uncontrolled output pulses. In case of undervoltage (VS < 16 V), the feedback output and the power output are switched off and locked for 40 ms. When the supply voltage has reached the switch-on-threshold of about 17 V, both output stages are enabled after a delay time of 40 ms.
Voltage Monitoring
An effective short-circuit detection of the external device is achieved by a drain-source voltage monitor. The voltage monitor comparator (pin 3) has a threshold of 1/3 V S . If the voltage applied to pin 3 exceeds this voltage, both output stages are switched off immediately and locked for 20 ms. With a hysteresis of 200 mV, the outputs are enabled again after a delay time of 20 ms. A voltage divider connected to VS is used to feed the input voltage to pin 3. A decoupling diode is recommended if the external power device`s drain source voltage exceeds 30 V (see Figure 5 on page 9). With the help of an external capacitor, connected to pin 3, the switching characteristic of the voltage monitor comparator can be varied according to the rising edge of the input signal at pin 9. During the off cycle, the capacitor is discharged, during the on-cycle, it is charged again. If the voltage monitoring function is not used, pin 3 should be connected to ground (see Figure 4 on page 9).
Application Hints
Due to high peak output currents, the layout of the PC board is essential. Appropriate decoupling capacitors should be used, otherwise, the performance of the driver degrades severely. It is strongly recommended to connect the blocking capacitors (low ESR types) as close as possible to the power supply and the ground pins. If necessary, two or more capacitors of different types may be connected in parallel. The two power ground pins, the ground pin, the two output pins and the two supply pins should be externally connected together as close as possible to the pins. The measurement pin (pin 5) and the test pin (pin 7) must not be used in any application and need to be tied to ground.
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Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Input voltage, voltage monitoring Output voltage Output voltage FEED Input voltage Input voltage measurement Input voltage TEST pin Output current FEED Output current Output current t 100 s Ambient temperature range Junction temperature range Storage temperature range Pin 1, 2 3 13, 14 8 9 5 7 8 13, 14 13, 14 Symbol VS VMonitor VOut VFEED VInput VMeas VTest IFEED IOut iOut Tamb Tj Tstg Min. -0,3 -0,3 -0,3 -0,3 -0,3 -0,3 -0,3 -10 -200 -4 -40 to +100 -40 to +150 -40 to +150 Max. 30 VS + 0,3 VS + 0,3 15 40 VS + 0,3 5 10 200 4 Unit V V V V V V V mA mA A C C C
Thermal Resistance
Parameters Junction to ambient Symbol RthJA Value 130 Unit K/W
ESD Protection
Parameters ESD (Human Body Model) ESD CDM (Charged Device Model) Test Conditions MIL-STD-883D Method 3015.7 STM 5.3.1 - 1999 Value 2 kV (pins 3 and 9: 1 kV) 500 V
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Electrical Characteristics
Conditions: 16 V < VS < 30 V; -40C < TA < 100C V1 = V2 = VS, V13 = V14 = VOut, V4 = V5 = V6 = V7 = 0 V V10 = V11 = V12 = GND = Reference point, unless otherwise specified
No. 1 1.1 2 3 3.1 3.2 3.3 4 4.1 4.2 4.3 4.4 4.5 5 5.1 5.2 5.3 5.4 5.5 6 6.1 6.2 6.3 6.4 6.5 Parameters Supply Voltage Range Supply voltage Current Consumption Vs 30 V; no load at "Feed" and "Output" 1, 2 1, 2 VS IVS 16 30 6 V mA C A Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
Undervoltage Detection (UVD) Switch-on threshold UVD Hysteresis UVD Timeout after undervoltage Voltage Monitoring (VM) Input Resistance Switch-off threshold VM Hysteresis VM Switch-off-delay monitor-output Timeout after switch-off by voltage monitoring Input Stage Input Resistance Switch-on-threshold Switch-off-threshold Propagation delay-time "Input - Feed" Propagation delay-time "Input - Output" Feed Output High voltage Feed, no load Output resistance high Output resistance low Rise time (10% to 90%) Fall time (10% to 90%) Pin 8 open, V9 8 V IFeed = -5 mA, V9 8 V IFeed = 5 mA, V9 3 V RFeed external = 2 kW, Rising edge at pin 9 RFeed external = 2 kW, Falling edge at pin 9 8 8 8 8 8 VFeed0 RFeedHi RFeedLo trFeed tfFeed 13 500 100 20 10 1000 500 V W W ns ns A A A A A 9 9 9 9-8 9 - 13 RiInput VINON VINOFF tdIn-Feed tdIn-Out 6 3 30 50 15 8 5 kW V V ns ns A A A A A 3 3 3 3 - 13, 14 3 - 13, 14 RiVM VToff dVS tdoffVM toffVM 15 30 VS/3 - 2% 70 VS/3 200 60 20 25 150 VS/3 + 4% kW V mV ns ms A A A A A 1, 2 1, 2 1, 2 VSon dVSon toffUVD 30 16 17 300 40 50 18 V mV ms A A A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
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Electrical Characteristics (Continued)
Conditions: 16 V < VS < 30 V; -40C < TA < 100C V1 = V2 = VS, V13 = V14 = VOut, V4 = V5 = V6 = V7 = 0 V V10 = V11 = V12 = GND = Reference point, unless otherwise specified
No. 7 7.1 7.2 7.3 7.4 Parameters Push-pull-outputstage On-resistance high On-resistance low Peak output current high Peak output current low IOut = -1 A, V9 8 V IOut = 1A, V9 3 V t 100 s, rising edge at pin 9 t 100 s, falling edge at pin 9 13 - 1, 2 13 13,14 13,14 ROutHigh ROutLow -iOut iOut trOut 12 2 2 4 4 W W A A A A D D Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
7.5
Rising edge at pin 9 Rise time (10% to 90%) external load: COut = 1 nF, ROut = 2 kW Falling edge at pin 9 Fall time (10% to 90%) external load: COut = 1 nF, ROut = 2 kW
13,14
ns
A
7.6
13,14
tfOut
12
ns
A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
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Figure 3. Timing Diagram(1) 1
VINPUT 15 V
7V
4V
t
VFEED 10 V 9V
1V t
trFeed tfFeed
VOUTPUT 24 V 21.6 V
2.4 V t
td In-Feed td In-Out tr Out td In-Feed tdIn-Out tfOut
Note:
1. A 2 kW resistor is connected between pin 8 and ground; a 2 kW resistor and a 1 nF capacitor are used as load for the power output (pins 13 and 14), simulating identical conditions as a power MOSFET, which is usually connected to the output.
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Figure 4. Application Circuit 1: Power Driver with Minimum External Components
VS
Monoflop Monoflop 1/3 VS 40 ms 20 ms 70K
Voltage Monitoring
MONITOR 3
Undervoltage Detection
12 V
FEED 8
Charge Pump
VS LOAD
Control 7 V/ 4V
VS 1, 2
Logic
9 INPUT 15K Pulse Shaping
Push Pull Output Stage
OUTPUT 13, 14 + CVS PGND 11, 12
MeasureLogic
TestLogic
GND
10
MEAS
5
TEST
7
GND
Figure 5. Application Circuit 2: Driver Circuit with Short-circuit Monitoring via the Drain-source Voltage of the Power Device
VS Voltage Monitoring
Monoflop Monoflop 1/3 VS 40 ms 20 ms 70K MONITOR 3
Undervoltage Detection
12 V
FEED 8
Charge Pump
VS LOAD
Control 7 V/ 4V
VS
1, 2
Logic
9 15K Pulse Shaping
Push Pull Output Stage
OUTPUT 13, 14 + CVS PGND 11, 12
MeasureLogic
TestLogic
GND
10
MEAS
5
TEST
7
GND
9
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Figure 6. Application Circuit 3: Six ATA6821 Used to Control a Three-phase Asynchronous Machine
VS1 Driver 1 VT1 VS2 Driver 2 VS3 Driver 3 VT2 VS4 L2 VT3 VS6 VS5 L1 L3 Driver 5
VP
Asynchronous machine
Driver 4 Driver 6
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VS Voltage Monitoring
Monoflop 1/3 VS 40 ms 20 ms 70K 3 Monoflop MONITOR
V1
t
V2 Undervoltage Detection
t
V3
12 V
VS
t Charge Pump Control 7 V/ 4V 15K Pulse Shaping 1, 2
VTn
VTn VS Vp
1
8
2
3
FEED
C Logic
OUTPUT 13, 14 9
INPUT
Push Pull Output Stage
+ CVS
Figure 7. External Components for one ATA6821 in Application Circuit 3: Potential-free Control of a Three-phase Asynchronous Machine
DGND MeasureLogic TestLogic
1:3
PGND 11, 12
GND 5 TEST 7
10
MEAS
VTn
ATA6821
11
Ordering Information
Extended Type Number ATA6821-TUS ATA6821-TUQ Package SO14 SO14 Remarks tubed taped and reeled
Package Information
Package SO14
Dimensions in mm
8.75 5.2 4.8 3.7
1.4 0.4 1.27 7.62 14 8 0.25 0.10 0.2 3.8 6.15 5.85
technical drawings according to DIN specifications
1
7
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4778A-AUTO-11/03

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