ATA6821 ATMEL

Document overview

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  • PDF pages: 13

Technical content

Features

 Push-pull Output Stage for 4 A Peak Current  Low Rdson < 2 Ω  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 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 µm 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. High Speed Power Driver IC ATA6821

2 ATA6821

Figure 1. Block Diagram

Figure 2. Pinning SO14 Note: 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.

1 VS Supply voltage

2 VS Supply voltage

3 MONITOR Voltage monitoring input

4 NC Not connected

5 MEAS Measurement pin

6 NC Not connected

8 FEED Feed output

9 INPUT Input

10 GND Ground

11 PGND Power ground (1)

12 PGND Power ground (1)

13 OUTPUT Output

14 OUTPUT Output

4 ATA6821

4778A–AUTO–11/03 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 k /g87 resistor is connected between pin 8 and ground; a 2 k /g87 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 (V S < 16 V), the feed- back 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 out- put 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 /g180 VS. 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 V S is used to feed the input volt- age 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, othe rwise, 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.

4778A–AUTO–11/03 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 Pin Symbol Min. Max. Unit Supply voltage 1, 2 V S -0,3 30 V Input voltage, voltage monitoring 3 V Monitor -0,3 V S + 0,3 V Output voltage 13, 14 V Out -0,3 V S + 0,3 V Output voltage FEED 8 V FEED -0,3 15 V Input voltage 9 V Input -0,3 40 V Input voltage measurement 5 V Meas -0,3 V S + 0,3 V Input voltage TEST pin 7 V Tes t -0,3 5 V Output current FEED 8 I FEED -10 10 mA Output current 13, 14 I Out -200 200 mA Output current t /g163 100 µs 13, 14 i Out -4 4 A Ambient temperature range T amb -40 to +100 /g176C Junction temperature range T j -40 to +150 /g176C Storage temperature range T stg -40 to +150 /g176C Thermal Resistance Parameters Symbol Value Unit Junction to ambient R thJA 130 K/W ESD Protection Parameters Test Conditions Value ESD (Human Body Model) MIL-STD-883D Method 3015.7 ±2 kV (pins 3 and 9: 1 kV) ESD CDM (Charged Device Model) STM 5.3.1 - 1999 ±500 V

6 ATA6821

4778A–AUTO–11/03

Electrical Characteristics

Conditions:

16 V < VS < 30 V; -40/g176C < TA < 100/g176C

V1 = V2 = VS, V13 = V14 = VOut, V4 = V5 = V6 = V7 = 0 V V10 = V11 = V12 = GND = Reference point, unless otherwise specified No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

1 Supply Voltage Range

1.1 Supply voltage 1, 2 V S 16 30 V C

2 Current Consumption Vs /g163 30 V; no load at

“Feed” and “Output” 1, 2 I VS 6m AA

3 Undervoltage Detection (UVD)

3.1 Switch-on threshold

UVD 1, 2 V Son 16 17 18 V A

3.2 Hysteresis UVD 1, 2 dV Son 300 mV A

3.3 Timeout after

undervoltage 1, 2 t offUVD 30 40 50 ms A

4 Voltage Monitoring (VM)

4.1 Input Resistance 3 Ri VM 30 70 150 k /g87 A

4.2 Switch-off threshold VM 3 V Toff

  • 2% VS/3 VS/3 + 4% VA

4.3 Hysteresis VM 3 dV S 200 mV A

4.4 Switch-off-delay

3 - 13, 14 tdoffVM 60 ns A

4.5 Timeout after switch-off

3 - 13, 14 toffVM 15 20 25 ms A

5 Input Stage

5.1 Input Resistance 9 Ri Input 15 k /g87 A

5.2 Switch-on-threshold 9 V INON 68 V A

5.3 Switch-off-threshold 9 V INOFF 35 V A

5.4 Propagation delay-time

“Input - Feed” 9 - 8 t dIn-Feed 30 ns A

5.5 Propagation delay-time

“Input - Output” 9 - 13 t dIn-Out 50 ns A

6 Feed Output

6.1 High voltage Feed, no

load Pin 8 open, V9 /g179 8 V 8 V Feed0 13 V A

6.2 Output resistance high I Feed = -5 mA, V9 /g179 8 V 8 R FeedHi 500 1000 /g87 A

6.3 Output resistance low I Feed = 5 mA, V9 /g163 3 V 8 R FeedLo 100 500 /g87 A

6.4 Rise time (10% to 90%) RFeed external = 2 k/g87,

Rising edge at pin 9 8t rFeed 20 ns A

6.5 Fall time (10% to 90%) RFeed external = 2 k/g87,

Falling edge at pin 9 8t fFeed 10 ns A *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

4778A–AUTO–11/03

7 Push-pull-outputstage

7.1 On-resistance high I Out = -1 A, V9 /g179 8 V 13 - 1, 2 R OutHigh 2 /g87 A

7.2 On-resistance low I Out = 1A, V9 /g163 3 V 13 R OutLow 2 /g87 A

7.3 Peak output current

t /g163 100 µs, rising edge at pin 9 13,14 -i Out 4AD

7.4 Peak output current low t /g163 100 µs, falling edge

at pin 9 13,14 i Out 4AD

7.5 Rise time (10% to 90%)

external load: COut = 1 nF , ROut = 2 k/g87 13,14 t rOut 12 ns A

7.6 Fall time (10% to 90%)

external load: COut = 1 nF , ROut = 2 k/g87 13,14 t fOut 12 ns A Electrical Characteristics (Continued) Conditions: V1 = V2 = VS, V13 = V14 = VOut, V4 = V5 = V6 = V7 = 0 V V10 = V11 = V12 = GND = Reference point, unless otherwise specified No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

8 ATA6821

Figure 3. Timing Diagram(1) 1 output (pins 13 and 14), simulating identical conditions as a power MOSFET , which is usually connected to the output.

10 ATA6821

Figure 6. Application Circuit 3: Six ATA6821 Used to Control a Three-phase Asynchronous Machine

Figure 7. External Components for one ATA6821 in Application Circuit 3:

12 ATA6821

4778A–AUTO–11/03

Package Information

Ordering Information

Extended Type Number Package Remarks ATA6821-TUS SO14 tubed ATA6821-TUQ SO14 taped and reeled technical drawings according to DIN specifications Dimensions in mm 0.25 0.10 8.75 0.4 1.27 7.62 1.4 5.2 4.8 3.7 3.8 6.15 5.85 0.2 14 8

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