AUIR2085STR - INFINEON TECHNOLOGIES AG

Sept 26, 2014

Automotive Grade

AUIR2085S

HIGH SPEED, 100V, SELF OSCILLATING 50%

DUTY CYCLE, HALF-BRIDGE DRIVER

Features

 Simple primary side control solution to enable half-

bridge DC-Bus Converters for 48V distributed systems

with reduced component count and board space

 Integrated 50% duty cycle oscillator & half-bridge driver

IC in a single SO-8 package

 Programmable switching frequency with up to 500kHz

max per channel

 +/- 1A drive current capability optimized for low charge

MOSFETs

 Adjustable dead-time 50ns – 200ns

 Floating channel designed for bootstrap operation up to

+100Vdc

 High and low side pulse width matching to +/- 25ns

 Adjustable overcurrent protection

 Undervoltage lockout and internal soft start

 Leadfree, RoHS compliant

 Automotive qualified*

Typical Applications

 DC-DC Converters

 HEV Auxiliary Converter

 Battery Management Converters

Product Summary

Topology Half-Bridge

VOFFSET ≤ 100 V

Io+ & I o- (typical) 1.0A & 1.0A

fOSC (max) 500kHz

Deadtime 50ns – 200ns

HO/LO Pulse Matching +/- 25ns

Package Options

8 - Lead SOIC

AUIR2085S

Typical Connection Diagram

VBIAS ( 10 V – 15 V)

VCC

DBOOT CBOOT

CBIAS

OSC

VIN (100 V max)

CRV

AUIRS2085

COM

AUIR2085S

Table of Contents Page

Typical Connection Diagram 1

Description/Feature Comparison 3

Qualification Information 4

Absolute Maximum Ratings 5

Recommended Operating Conditions 5

Dynamic Electrical Characteristics 6

Static Electrical Characteristics 6

Functional Block Diagram 7

Input/Output Pin Equivalent Circuit Diagram 9

Lead Definitions 10

Lead Assignments 10

Package Details 12

Tape and Reel Details 13

Part Marking Information 14

Ordering Information 15

AUIR2085S

Description

The AUIR2085S is a self oscillating half-bridge driver IC with 50% duty cycle ideally suited for 36V – 75V

half-bridge DC-bus converters.

This product is also suitable for push-pull converters without restriction on input voltage.

Each channel frequency is equal to fOSC, which can be set by selecting RT & CT, as for Fig. 1. Dead-time can

be controlled through proper selection of CT and can range from 50ns to 200ns, as for Fig.2.

Internal soft-start increases the pulse width during power up and maintains pulse width matching for the high

and low outputs throughout the start up cycle.

Typically soft-start duty cycle varies beginning from 5-10% ramping up to about 50% over 1000 cycles.

The AUIR2085S initiates a soft start at power up and after every overcurrent condition. Undervoltage lockout

prevents operation if VCC is less than 7.5V.

AUIR2085S

Qualification Information†

Qualification Level

Automotive

(per AEC-Q100)

Comments: This family of ICs has passed an Automotive

qualification. IR’s Industrial and Consumer qualification level

is granted by extension of the higher Automotive level.

Moisture Sensitivity Level SOIC8N MSL3†† 260°C

(per IPC/JEDEC J-STD-020)

ESD Machine Model Class M2 (+/-200V)

(per AEC-Q100-003)

Human Body Model Class H1B (+/-1750V)

(per AEC-Q100-002)

Charged Device Model Class C4 (+/-1000V)

(per AEC-Q100-011)

IC Latch-Up Test Class II, Level B

(per AEC-Q100-004)

RoHS Compliant Yes

† Qualification standards can be found at International Rectifier’s web site http://www.irf.com/

†† Higher MSL ratings may be available for the specific package types listed here. Please contact your

International Rectifier sales representative for further information.

AUIR2085S

Recommended Operating Conditions

For proper operation the device should be used within the recommended conditions.

† Care should be taken to avoid output switching conditions where the VS node flies inductively below

ground by more than 5V.

Absolute Maximum Ratings

Absolute Maximum Ratings indicate sustained limits beyond which damage to the device may occur. All

voltage parameters are absolute voltages referenced to COM. The thermal resistance and power

dissipation ratings are measured under board mounted and still air conditions.

Symbol Definition Min. Max. Units

VB High side floating supply voltage -0.3 150

VCC Low side supply voltage — 25

VS High side floating supply offset voltage VB - 25 VB + 0.3

VHO High side floating output voltage VB - 0.3 VB + 0.3

VLO Low side output voltage -0.3 VCC + 0.3

OSC OSC pin voltage -0.3 VCC + 0.3

VCS C

S pin voltage -0.3 VCC + 0.3

dVs/dt Allowable offset voltage slew rate — 50 V/ns

PD Package power dissipation @ TA ≤ 25°C — 0.625 W

RthJA Thermal resistance, junction to ambient — 200 °C/W

TJ Junction temperature — 150

°C

TS Storage temperature -55 150

TL Lead temperature (soldering, 10 seconds) — 300

Symbol Definition Min. Max. Units

VB High side floating supply voltage VS + 10 VS + 15

VS Steady state high side floating supply offset voltage -5 (†) 100

VCC Supply voltage 10 15

ICC Supply current — 5 mA

RT Timing resistor 10 100 kΩ

CT Timing capacitor 47 470 pF

fosc Operating frequency (per channel) — 500 kHz

TA Ambient temperature -40 125 °C

AUIR2085S

Dynamic Electrical Characteristics

VCC = VBS = 12V, CLOAD = 1000pF, and TA = 25°C unless otherwise specified.

Static Electrical Characteristics

VCC = VBS = 12V, CLOAD = 1000pF, and TA = 25°C unless otherwise specified.

Symbol Definition Min Typ Max Units Test Conditions

Turn-on rise time — 40 60 ns VS = 0V

tf Turn-off fall time — 20 30

fOSC Per channel output frequency 500 — — kHz CT = 100pF,

RT = 10kΩ

tDT HO/LO output dead time 50 — —

tDCS Overcurrent shut down delay — 200 — Pulse on CS

PM HO/LO pulse width mismatch -25 — 25 VS = 0V ~ 100V

Symbol Definition Min Typ Max Units Test Conditions

VOH High level output voltage, VCC or VBS – VO — — 1.5

VOL Low level output voltage — — 0.1

IIeak Offset supply leakage current — — 50 µA

IQBS Quiescent VBS supply current — — 150

IQCC Quiescent VCC supply current — — 1.5 mA

VCS+ Overcurrent shutdown threshold 250 300 350 mV

VCS- Overcurrent shutdown threshold 150 200 250 mV

VCCUV+ Undervoltage positive going threshold 6.8 7.3 7.8

VCCUV- Undervoltage negative going threshold 6.3 6.8 7.3

VBSUV+ High side undervoltage positive going

threshold 6.8 7.3 7.8

VBSUV- High side undervoltage negative going

threshold 6.3 6.8 7.3

IO+ Output high short circuit current — 1.0 — A

IO- Output low short circuit current — 1.0 —

AUIR2085S

Functional Block Diagram

COM

AUIR2085S

Input/Output Pin Equivalent Circuit Diagrams

VCC

COM

ESD

Diode

ESD

Diode

RESD

ESD

Diode

ESD

Diode

AUIR2085S

Lead Definitions

PIN Symbol Description

1 CS Current sense input

2 OSC Oscillator pin

3 COM Logic supply return

4 LO Low side output

5 VCC Logic supply

6 VS Floating supply return

7 HO High side output

8 VB High side floating supply

Lead Assignments

AUIR2085S

Pin Descriptions

Cs: The input pin to the overcurrent comparator. Exceeding the overcurrent threshold value specified in

“Static Electrical Parameters” Section will terminate output pulses and start a new soft start cycle as soon as

the voltage on the pin reduce below the threshold value.

OSC: The oscillator-programming pin. Only two components are required to program the internal oscillator

frequency: a resistor connected between the VCC pin and the OSC pin, and a capacitor connected from the

OSC to COM. The expected oscillator frequency is shown in Figure 1.

The recommended range of timing resistors RT is between 10kΩ and 100kΩ and range of timing capacitor

CT is between 47pF and 470pF. Timing resistors values less than 10kΩ should be avoided. The value of the

timing capacitor determines the amount of dead time between the two output drivers: lower the CT, shorter

the dead time and vice versa. It is not recommended to use a timing capacitor below 47pF, for best

performance keep the timing components physically as close as possible to the AUIR2085S. Separated

ground and VCC traces to the timing components are encouraged.

COM: Signal ground and power ground for all functions. Due to high current and high frequency operation, a

low impedance circuit board ground plane is highly recommended.

HO, LO: High side and low side gate drive pins. The high and low side drivers can directly drive the gate of a

power MOSFET. The drivers are capable of 1A peak source and sink currents. It is recommended that the

high and low drive pins be very close to the gates of the high side and low side MOSFETs to prevent any

delay and distortion of the drive signals.

VB: The high side power input connection. The high side supply is derived from a bootstrap circuit using a

low-leakage Schottky diode and a ceramic capacitor. To prevent noise, the Schottky diode and bypass

capacitor should be very close to the AUIR2085S.

VS: The high side power return connection. VS should be connected directly to the source terminal of high

side MOSFET with a trace as short as possible.

VCC: The IC bias input connection for the device. Although the quiescent VCC current is very low, total supply

current will be higher, depending on the gate charge of the MOSFETs connected to the HO and LO pins, and

the programmed oscillator frequency, total VCC current is the sum of quiescent VCC current and the average

current at HO and LO. Knowing the operating frequency and the MOSFET gate charge (Qg) at selected VCC

voltage, the average current (including bootstrap function) can be calculated from:

Iave = 2 x Qg X fOSC

To prevent noise problem, a bypass ceramic capacitor connected to VCC and COM should be placed as

close as possible to the AUIR2085S.

AUIR2085S has an under voltage lookout feature for the IC bias supply, VCC. The minimum voltage required

on VCC to make sure that IC will work within specifications must be higher than 8.5V (10V minimum VCC is

recommended to prevent asymmetrical gates signal on HO and LO pins that are expected when VCC is

between 7.5V and 8.5V).

AUIR2085S

Package Details:

AUIR2085S

Tape and Reel Details:

CARRIER TAPE DIMENSION FOR 8SOICN

Code Min Max Min Max

A 7.90 8.10 0.311 0.318

B 3.90 4.10 0.153 0.161

C 11.70 12.30 0.46 0.484

D 5.45 5.55 0.214 0.218

E 6.30 6.50 0.248 0.255

F 5.10 5.30 0.200 0.208

G 1.50 n/a 0.059 n/a

H 1.50 1.60 0.059 0.062

REEL DIMENSIONS FOR 8SOICN

Code Min Max Min Max

A 329.60 330.25 12.976 13.001

B 20.95 21.45 0.824 0.844

C 12.80 13.20 0.503 0.519

D 1.95 2.45 0.767 0.096

E 98.00 102.00 3.858 4.015

F n/a 18.40 n/a 0.724

G 14.50 17.10 0.570 0.673

H 12.40 14.40 0.488 0.566

Metric Imperial

OTE : CONTROLLING

DIMENSION IN MM

LOAD ED TAPE F EE D DIRECTION

AUIR2085S

Part Marking Information

AUIR2085S

Ordering Information

Base Part Number Package Type Standard Pack Complete Part Number

Form Quantity

AUIR2085S SOIC8 Tube/Bulk 95 AUIR2085S

Tape and Reel 2500 AUIR2085STR

IMPORTANT NOTICE

AUIR2085S

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reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products

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http://www.irf.com/technical-info/

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