IR2086S(PbF)
Lead Definitions
Symbol Description
Lead Assignments
VCC
Supply
1
n/c
IR2086S
VB1 16
COM1,2
VB1,2
VS1,2
HO1,2
LO1,2
CT
Supply return
High side floating supply
Floating supply return
High side output
Low side output
Oscillator Input
2
3
4
5
6
7
CS
DELAY
CT
COM1
LO1
VCC
HO1 15
VS1 14
COM2 13
LO2 12
VS 2 11
HO2 10
CS
Current sense input
8
n/c
VB2
9
DELAY
Over current restart delay
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:
t d ≈
C d V cc
2 uA
+ 10 us
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:
f osc = 1 / (2 · R T · C T )
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.
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