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- Push-pull Output Stage for 4A Peak Current Low Rdson < 2Ω 12V 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 from16V up to 30V Fully Integrated Charge Pump Electrostatic sensitive device. Observe precautions for handling. 1. Description The ATA6821 is a single-channel high-spe ed power driver IC designed with Atmel’s 0.8 µm BCDMOS technology. With its extremely 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 4A. The ATA6821 is designed to control high cur rents 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 Rev. 4778B–AUTO–09/05
4778B–AUTO–09/05 ATA6821 Figure 1-1. Block Diagram FEED 1/3 VS Charge Pump Monoflop 40 ms Monoflop 20 ms Control - Logic Test- Logic Push Pull Output Stage 12 V Undervoltage Detection VS MEAS Pulse Shaping 7 V/ 4 V VS 1, 2 OUTPUT 13, 14 PGND 11, 12 MONITOR Voltage Monitoring TEST 70K 15K Measure- Logic GND 10
4778B–AUTO–09/05 ATA6821 2. Pin Configuration Figure 2-1. 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. VS VS MONITOR NC NC MEAS TEST OUTPUT OUTPUT PGND PGND GND INPUT FEED Table 2-1. Pin Description Pin Symbol Function
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
7 TEST Test pin
8 FEED Feed output
9 INPUT Input
10 GND Ground
(1)
11 PGND Power ground (1)
12 PGND Power ground (1)
13 OUTPUT Output
14 OUTPUT Output
4778B–AUTO–09/05 ATA6821 3. Functional Description The ATA6821 controls a push-pull power output stage for an external power device and a feed- back output stage. If the voltage at the input pin is > 7V, both outputs are at “high-level”, if the input voltage falls below the switch-off threshold of 4V, both outputs are switched to ground. If a rectangular input signal is fed to the input, the feedback output “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 7-5 on page 12), the integrated pulse shaping circuit is used to achieve a reliable feedback con- figuration 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 7-1 on page 9. The timing diagram is based on t he following test conditions: A 2 kΩ resistor is connected between pin 8 and ground; a 2 k Ω 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.
3.1 Undervoltage Detection
During power-up and power-down of the supply vo ltage, the internal undervoltage circuit sup- presses uncontrolled output pulses. In case of undervoltage (VS < 16V), 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 17V, both output stages are enabled after a delay time of 40 ms.
3.2 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 × 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 volt- age divider connected to V S 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 30V (see Figure 7-3 on page 10). With the help of an external capacitor, connected to pin 3, the switching characteristic of the volt- age 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 7-2 on page 10).
4778B–AUTO–09/05 ATA6821
3.3 Application Hints
Due to high peak output currents, the layout of the PC board is essential. Appropriate decou- pling 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 possi- ble 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.
4778B–AUTO–09/05 ATA6821 4. 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 Test –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 ≤ 100 µs 13, 14 i Out –4 4 A Ambient temperature range T amb –40 to +100 °C Junction temperature range T j –40 to +150 °C Storage temperature range T stg –40 to +150 °C 5. Thermal Resistance Parameters Symbol Value Unit Junction to ambient R thJA 130 K/W 6. ESD Protection Parameters Test Conditions Value ESD (Human Body Model) MIL-STD-883D Met hod 3015.7 ±2 kV (pins 3 and 9: 1 kV) ESD CDM (Charged Device Model) STM 5.3.1 - 1999 ±500V
4778B–AUTO–09/05 ATA6821 7. Electrical Characteristics Conditions: 16V < VS < 30V; –40°C < TA < 100°C V1 = V2 = VS, V13 = V14 = VOut, V4 = V5 = V6 = V7 = 0V V10 = V11 = V12 = GND = Reference point, unless otherwise specified No. Parameters Test Conditions Pi n 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 ≤ 30V; 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 Ω 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 to 13, 14 tdoffVM 60 ns A
4.5 Timeout after switch-off
3 to 13, 14 toffVM 15 20 25 ms A
5 Input Stage
5.1 Input Resistance 9 Ri Input 15 k Ω 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” 8, 9 t dIn-Feed 30 ns A
5.5 Propagation delay-time
“Input - Output” 9 to 13 t dIn-Out 50 ns A 6F e e d O u t p u t
6.1 High voltage Feed, no
load Pin 8 open, V9 ≥ 8V 8 V Feed0 13 V A
6.2 Output resistance high I Feed = –5 mA, V9 ≥ 8V 8 R FeedHi 500 1000 Ω A
6.3 Output resistance low I Feed = 5 mA, V9 ≤ 3V 8 R FeedLo 100 500 Ω A
6.4 Rise time (10% to 90%) RFeed external = 2 kΩ,
Rising edge at pin 9 8t rFeed 20 ns A
6.5 Fall time (10% to 90%) RFeed external = 2 kΩ,
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
4778B–AUTO–09/05 ATA6821
7 Push-pull-outputstage
7.1 On-resistance high I Out = –1 A, V9 ≥ 8V 13 - 1, 2 R OutHigh 2 Ω A
7.2 On-resistance low I Out = 1A, V9 ≤ 3V 13 R OutLow 2 Ω A
7.3 Peak output current
t ≤ 100 µs, rising edge at pin 9 13,14 -i Out 4AD
7.4 Peak output current low t ≤ 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 kΩ 13,14 t rOut 12 ns A
7.6 Fall time (10% to 90%)
external load: COut = 1 nF , ROut = 2 kΩ 13,14 t fOut 12 ns A 7. Electrical Characteristics (Continued) Conditions: 16V < VS < 30V; –40°C < TA < 100°C V1 = V2 = VS, V13 = V14 = VOut, V4 = V5 = V6 = V7 = 0V V10 = V11 = V12 = GND = Reference point, unless otherwise specified No. Parameters Test Conditions Pi n Symbol Min. Typ. Max. Unit Type* *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
4778B–AUTO–09/05 ATA6821 Figure 7-1. Timing Diagram(1) 1 Note: 1. A 2 k Ω resistor is connected between pin 8 and ground; a 2 kΩ 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. VINPUT VFEED VOUTPUT 7 V 15 V 4 V 10 V 9 V 1 V t t t 24 V 21.6 V 2.4 V tdIn-Out tdIn-Feed tdIn-Out td In-Feed trFeed tfFeed tr Out tfOut
4778B–AUTO–09/05 ATA6821 Figure 7-4. Application Circuit 3: Six ATA6821 Used to Control a Three-phase Asynchronous Machine Driver 1 Driver 2 Driver 3 Driver 4 Asynchronous machine VP Driver 5 Driver 6 VS1 L3L1 VS2 VS3 VS4 VT1 VT2 VT3 VS5 VS6
4778B–AUTO–09/05 ATA6821 Figure 7-5. External Components for one ATA6821 in Application Circuit 3: Potential-free Control of a Three-phase Asynchronous Machine FEED 1/3 VS Charge Pump Monoflop 40 ms Monoflop 20 ms Control - Logic Test- Logic Push Pull Output Stage 12 V Undervoltage Detection VS MEAS Pulse Shaping 7 V/ 4 V VS 1, 2 OUTPUT 13, 14 PGND 11, 12 MONITOR Voltage Monitoring TEST 70K 15K Measure- Logic GND 10 INPUT t t t µC 12 3 1:3 DGND VTn VTn VS Vp VTn CVS
4778B–AUTO–09/05 ATA6821 9. Package Information 10. Revision History 8. Ordering Information Extended Type Number Package Remarks ATA6821-TUSY SO14 Tubed, Pb-free ATA6821-TUQY SO14 Taped and reeled, Pb-free 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 Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History 4778B-AUTO-09/05
- Put datasheet in a new template
- Pb-free logo on page 1 added
- Ordering Information on page 13 changed
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