V
CC (max)
25V
V
offset(max)
100Vdc
High/low side
output freq (f
osc
) 500kHz
Output Current (I
O
) +/-1.2A
High/low side pulse
edge matching +/- 25ns
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
IR2086S
Data Sheet PD No.60226
Package
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 C
T
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 10
s to 1s.
Typical
Connection
(Refer to Lead Assign-
ments for correct pin
configuration). This/
These diagram(s)
show electrical connec-
tions only. Please refer
to our Application
Notes and DesignTips
for proper circuit board
layout.
16-Lead SOIC
Product Summary
RSENSE
IR2086S
CD**
LO1
HO1
VB1
COM2*
VS1
VB2
HO2
VS2
VCC
LO2
*COM2 must be shorted to COM1 for proper operation
**CD is optional
VBUSS (100 VDC MAX)
DELAY
CS
COM1
CT
RT
CT
VCC (9 ~15V)
2
IR2086S
www.irf.com
Absolute Maximum Ratings
V
BIAS
(V
CC
, V
BS
) = 12V, C
L
= 1000 pF, and T
A
= 25
C 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.
Note1: Care should be taken to avoid output switching conditions where the Vs node flies inductively below ground by
more than 5V.
Symbol
Definition
Min.
Max.
Units
V
CC
Low side supply voltage
-0.3
25
V
B1,2
High side floating supply voltage
-0.3
150
V
S1,2
High side floating supply offset voltage
V
B1,2
- 25
V
B1,2
+ 0.3
V
HO1,2
High side floating output voltage
V
B1,2
- 0.3
V
B1,2
+ 0.3
V
LO1,2
Low side output voltage
-0.3
V
CC
+ 0.3
V
CT
CT pin voltage
-0.3
V
CC
+ 0.3
V
CS
Cs pin voltage
-0.3
V
CC
+ 0.3
V
DELAY
Delay pin voltage
-0.3
V
CC
+ 0.3
dV
S
/dt
Allowable offset voltage slew rate
-50
+50
V/ns
I
CC
Supply current
--
40
mA
P
D
Package power dissipation
(16-lead SOIC)
--
1.0
W
Rth
JA
Thermal resistance, junction to ambient
(16-lead SOIC)
--
200
C/W
T
J
Junction temperature
-55
150
T
S
Storage temperature
-55
150
T
L
Lead temperature (soldering, 10 seconds)
--
300
Vdc
C
Recommended Operating Conditions
For proper operation the device should be used within the recommended conditions.
V
B1,2
High side floating supply voltage
9.5
15
V
S1,2
Steady state high side floating supply offset voltage
-5
100
V
CC
Supply voltage
9.5
15
I
CC
Supply current
--
1
mA
R
T
Timing resistor
10
100
Kohms
C
T
Timing capacitor
47
1000
pF
fmax
Operating frequency (per channel)
-- 500
KHz
T
j
Junction temperature
-40
125
C
Vdc
Symbol
Definition
Min.
Max.
Units
3
IR2086S
www.irf.com
Dynamic Electrical Characteristics
V
BIAS
(V
CC
, V
BS
) = 12V, C
L
= 1000 pF, and T
A
= 25
C unless otherwise specified.
Symbol
Definition
Min. Typ.
Max. Units Test Conditions
tr
Turn-on rise time
--
40
60
tf
Turn-off fall time
--
20
30
fout
Per channel output frequency
450
500
550
KHz
tdt
High/low output dead time
50
--
--
PM
High/low pulse width matching
--
25
--
V
S
= 0V ~ 100V
tdcs
Overcurrent shut down delay
--
200
--
trestart
Overcurrent restart delay
--
0.5
--
sec
Vcc =15V, Cd=100nF
nsec
V
S
= 0V
Ct=100pF,
Rt=10Kohm
nsec
Static Electrical Characteristics
V
BIAS
(V
CC
, V
BS
) = 12V, C
L
= 1000 pF and T
A
= 25
C unless otherwise specified.
Symbol
Definition
Min.
Typ. Max. Units Test Conditions
V
OH1,2
High level output voltage, (V
BIAS
- V
O
)
--
--
1.5
V
OL1,2
Low level output voltage
--
--
0.1
Ileak
Offset supply leakage current
--
--
50
I
QBS
Quiescent V
BS
supply current
--
--
150
I
QCC
Quiescent V
CC
supply current
--
--
1.75
mA
V
CS+
Overcurrent shutdown threshold
--
300
--
mV
U
VCC+
Undervoltage positive going threshold
6.5
7.25
8.0
U
VCC-
Undervoltage negative going threshold
6.0
6.8
7.7
I
O+
Output high short circuit current
--
1.2
--
I
O-
Output low short circuit current
--
1.2
--
V
A
V
A
4
IR2086S
www.irf.com
Functional Block Diagrams
CS
UVLO
PULSE
STEERING
OSC
HV LEVEL
SHIFTER1
dv/dt
BOOSTER1
R
S
UVBS1
VB1
HO1
VS1
VCC
CT
COM
200mV
COMP
DEAD
TIME
IR2086
SELF OSCILLATING
FULL BRIGDE DRIVER
WITH SOFT START,
OVER CURRENT
SHUT DOWN, AND
DELAYED RESTART
R QN
S Q
DELAY
COMP
SOFT
START
OVER CURRENT
SENSE WITH
DELAYED RESTART
LO1
DELAY
MATCH 1
VCC
LO2
DELAY
MATCH 2
VCC
HV LEVEL
SHIFTER2
dv/dt
BOOSTER2
R
S
UVBS2
VB2
HO2
VS2
S
5
IR2086S
www.irf.com
Symbol Description
VCC
Supply
COM1,2
Supply return
VB1,2
High side floating supply
VS1,2
Floating supply return
HO1,2
High side output
LO1,2
Low side output
CT
Oscillator Input
CS
Current sense input
DELAY
Over current restart delay
Lead Definitions
Lead Assignments
16
12
13
14
15
11
10
9
1
5
4
3
2
6
7
8
VB1
HO1
VS1
COM2
LO2
VS1
HO2
VB2
VCC
COM1
CS
CT
IR2086S
DELAY
LO1
n/c
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:
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:
Where frequency is in Hertz (Hz), R
T
resistance in Ohms (
) and C
T
capacitance in Farads (F). The recom-
mended 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.
us
uA
V
C
t
cc
d
d
10
2
+
f
osc
= 1 / (2 R
T
C
T
)
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