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Data Sheet PD No.60226
IR2086S
HIGH SPEED, 100V, SELF OSCILLATING 50% DUTY CYCLE, FULL-BRIDGE DRIVER
Features
* * * * * * * *
Simple primary side control solution to enable full-bridge DC-Bus Converters for 48V distributed systems with reduced component count and board space. Frequency and dead time set by two external components Maximum 500KHz per channel output with 50% duty cycle Adjustable dead time 50nsec ~ 200nsec Floating channel designed for bootstrap operation up to +100Vdc High and low side pulse width matching to +/- 25nsec Overcurrent protection with adjustable hiccup period. Undervoltage lockout and internal soft start
Product Summary
VCC (max) Voffset(max) High/low side output freq (fosc) Output Current (IO) High/low side pulse edge matching 25V 100Vdc 500kHz +/-1.2A +/- 25ns
Description
The IR2086S is a self oscillating full-bridge controller and driver IC with 50% duty cycle ideally suited for 36V-75V full-bridge DC Bus Converters. Dead time can be controlled through proper selection of CT and can range from 50 to 200nsec. Internal soft start increases pulse width on power up and maintains equal pulse widths for the high and low outputs throughout the start up cycle. Undervoltage lockout prevents operation if Vcc is less than 7.5 Vdc. Over current shutdown occurs when the voltage on the Cs pin exceeds 200mV. Restart after overcurrent trip can be delayed by adjusting the external capacitor. The delay time ranges from 10s to 1s.
Package
16-Lead SOIC
Typical Connection
VBUSS (100 VDC MAX) VCC (9 ~15V)
IR2086S RT CS
(Refer to Lead Assignments for correct pin configuration). This/ These diagram(s) show electrical connections only. Please refer to our Application Notes and DesignTips for proper circuit board layout.
CT
CD**
DELAY CT COM2* COM1 LO2 VS2 LO1 VCC HO2 VB2 RSENSE
VB1 HO1 VS1
*COM2 must be shorted to COM1 for proper operation **CD is optional
IR2086S
Absolute Maximum Ratings
VBIAS (VCC, VBS) = 12V, CL = 1000 pF, and TA = 25C unless otherwise specified. Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are absolute voltages referenced to COM. All currents are defined positive into any lead. The thermal resistance and power dissipation ratings are measured under board mounted and still air conditions.
Symbol
VCC VB1,2 VS1,2 VHO1,2 VLO1,2 VCT VCS VDELAY dVS/dt ICC PD RthJA TJ TS TL Low side supply voltage
Definition
High side floating supply voltage High side floating supply offset voltage High side floating output voltage Low side output voltage CT pin voltage Cs pin voltage Delay pin voltage Allowable offset voltage slew rate Supply current Package power dissipation Thermal resistance, junction to ambient Junction temperature Storage temperature Lead temperature (soldering, 10 seconds) (16-lead SOIC) (16-lead SOIC)
Min.
-0.3 -0.3 VB1,2 - 25 VB1,2 - 0.3 -0.3 -0.3 -0.3 -0.3 -50 -- -- -- -55 -55 --
Max.
25 150 VB1,2 + 0.3 VB1,2 + 0.3 VCC + 0.3 VCC + 0.3 VCC + 0.3 VCC + 0.3 +50 40 1.0 200 150 150 300
Units
Vdc
V/ns mA W C/W C
Recommended Operating Conditions
For proper operation the device should be used within the recommended conditions.
Symbol
VB1,2 VS1,2 VCC ICC RT CT fmax Tj
Definition
High side floating supply voltage Steady state high side floating supply offset voltage Supply voltage Supply current Timing resistor Timing capacitor Operating frequency (per channel) Junction temperature
Min.
9.5 -5 9.5 -- 10 47 -- -40
Max.
15 100 15 1 100 1000 500 125
Units
Vdc mA Kohms pF
KHz
C
Note1: Care should be taken to avoid output switching conditions where the Vs node flies inductively below ground by more than 5V.
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IR2086S
Dynamic Electrical Characteristics
VBIAS (VCC, VBS) = 12V, CL = 1000 pF, and TA = 25C unless otherwise specified.
Symbol
tr tf fout tdt PM tdcs trestart
Definition
Turn-on rise time Turn-off fall time Per channel output frequency High/low output dead time High/low pulse width matching Overcurrent shut down delay Overcurrent restart delay
Min.
-- -- 450 50 -- -- --
Typ.
40 20 500 -- 25 200 0.5
Max. Units Test Conditions
60 30 550 -- -- -- -- sec Vcc =15V, Cd=100nF nsec nsec KHz VS = 0V Ct=100pF, Rt=10Kohm VS = 0V ~ 100V
Static Electrical Characteristics
VBIAS (VCC, VBS) = 12V, CL = 1000 pF and TA = 25C unless otherwise specified.
Symbol
VOH1,2 VOL1,2 Ileak IQBS IQCC VCS+ UVCC+ UVCCIO+ IO-
Definition
High level output voltage, (VBIAS - VO) Low level output voltage Offset supply leakage current Quiescent VBS supply current Quiescent VCC supply current Overcurrent shutdown threshold Undervoltage positive going threshold Undervoltage negative going threshold Output high short circuit current Output low short circuit current
Min. Typ. Max. Units Test Conditions
-- -- -- -- -- -- 6.5 6.0 -- -- -- -- -- -- -- 300 7.25 6.8 1.2 1.2 1.5 0.1 50 150 1.75 -- 8.0 7.7 -- -- A V A mA mV V
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IR2086S
Functional Block Diagrams
VCC dv/dt BOOSTER1 DEAD TIME HV LEVEL SHIFTER1 R S HO1 VB1
UVLO
UVBS1
CT
OSC
PULSE STEERING
VS1 VCC COMP SOFT START DELAY MATCH 1 LO1
VB2 DELAY dv/dt BOOSTER2
UVBS2
R QN CS COMP S Q
HV LEVEL SHIFTER2
R S HO2
200mV COM
OVER CURRENT SENSE WITH DELAYED RESTART
VS2 VCC DELAY MATCH 2 LO2
IR2086S SELF OSCILLATING FULL BRIGDE DRIVER WITH SOFT START, OVER CURRENT SHUT DOWN, AND DELAYED RESTART
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IR2086S
Lead Definitions
Symbol Description
VCC COM1,2 VB1,2 VS1,2 HO1,2 LO1,2 CT CS DELAY Supply Supply return High side floating supply Floating supply return High side output Low side output Oscillator Input Current sense input Over current restart delay
Lead Assignments
1 2 3 4 5 6 7 8
n/c
IR2086S
VB1 16 HO1 15 VS1 14 COM2 13 LO2 12 VS1 11 HO2 10 VB2
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CS DELAY CT COM1 LO1 VCC
n/c
Detailed Pin Description
Cs: The input pin to the overcurrent comparator. Exceeding the overcurrent threshold value specified in "Static Electrical Parameters" Section will terminate output pulses. A new soft start cycle will commence after the expiration of the programmed delay time at DELAY pin. DELAY: Delay programming pin for restart after overcurrent condition. A capacitor connected to this pin will determine the delay form the over current trip to the beginning of a new soft start cycle. The delay time ranges from 10us to 1s, and is set according to:
td
Cd Vcc + 10us 2uA
CT: The oscillator-programming pin. Only two components are required to program the internal oscillator frequency: a resistor connected between the Vcc pin and the CT pin, and a capacitor connected from the CT pin to GND. The approximate oscillator frequency is determined by the following simple formula:
fosc = 1 / (2 * RT * CT)
Where frequency is in Hertz (Hz), RT resistance in Ohms () and CT capacitance in Farads (F). The recommended range of timing resistors is between 10k and 100k and range of time capacitances is between 47pF and 470pF. The timing resistors less than 10k 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 time components as close as possible to the IR2086S. Separated ground and Vdd traces to the timing components are encouraged.
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IR2086S
Detailed Pin Description continued
COM1, COM2: 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. HO1, HO2, LO1, LO2: 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. Vb1, Vb2: High side power input connection. The high side supplies are derived from bootstrap circuits using low-leakage Schottky diodes and ceramic capacitors. To prevent noise, the Schottky diodes and bypass capacitors should be very close to the IR2086S. Vs1, Vs2: 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 to drive four power MOSFETs in full-bridge configuration can be calculated from: Iave = 2 x Qg X fosc (Note that fosc is equal to the output frequency - twice the frequency of each individual bridge leg on the primary.) To prevent noise problem, a bypass ceramic capacitor connected to Vcc and COM1 / COM2 should be placed as close as possible to the IR2086S. IR2086S 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 (9.5V minimum Vcc is recommended to prevent asymmetrical gates signals on HO and LO pins that are expected when Vcc is between 7.5V and 8.5V).
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IR2086S
1000.00
300
250
100.00 f(KHz)
1nF
100pF
DT (nsec)
200 500pF 200pF 100pF
200pF 500pF
10.00
150
1nF
100
50
1.00 0 20 40 60 RT (KOhms) 80 100 120
0 0 20 40 60 RT(KOhms) 80 100 120
Fig. 1 Output Frequency (-25oC to 125oC)
Fig. 2 Dead Time (@27oC)
350
1.0E+07
1nF
300
OVER CURRENT RESTART DELAY TIME (uSEC
1.0E+06 100nF 1.0E+05 10nF 1.0E+04 1nF 1.0E+03 1.0E+02 10pF 1.0E+01 1.0E+00 -50 0 50 TEM P (C) 100 150
250
DT (nsec)
200
500pF 200pF
150
100
100pF
50
0 -50 0 50 TEMP (C) 100 150
Fig. 3 Dead Time vs Temp
Fig. 4 Over Current Restart Delay Time vs Temp (Vcc = 15V)
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IR2086S
Case outlines
16-Lead SOIC (narrow body)
01-6018 01-3064 00 (MS-012AC)
WORLD HEADQUARTERS: 233 Kansas Street, El Segundo, California 90245 Tel: (310) 252-7105 This product has been designed and qualified for the industrial market http://www.irf.com/ Data and specifications subject to change without notice. 11/4/2004
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