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International Rectifier Electronic Components Datasheet

IR2085S Datasheet

HIGH SPEED/ 100V/ SELF OSCILLATING 50% DUTY CYCLE/ HALF-BRIDGE DRIVER

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Data Sheet No. PD60206 Rev.C
IR2085S &(PbF)
HIGH SPEED, 100V, SELF OSCILLATING 50% DUTY CYCLE,
Features
HALF-BRIDGE DRIVER
Simple primary side control solution to enable half-bridge
Product Summary
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
VCC (max)
Voffset(max)
High/low side
25V
100Vdc
channel
+/- 1A drive current capability optimized for low charge MOSFETs
Adjustable dead-time 50nsec – 200nsec
Floating channel designed for bootstrap operation up to +100Vdc
High and low side pulse width matching to +/- 25nsec
Adjustable overcurrent protection
Undervoltage lockout and internal soft start
Also available LEAD-FREE
Description
output freq (fosc)
500kHz
Output Current (IO)
+/-1.0A(typ.)
High/low side pulse
width matching
+/- 25ns
Package
The IR2085S 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, where fosc can be set by selecting RT & CT,
where fosc 1/(2*RT.CT). Dead-time can be controlled through proper selection of CT
and can range from 50 to 200nsec. Internal soft-start increases the pulse width during
S O -8
power up and maintains pulse width matching for the high and low outputs throughout the start up cycle. The
IR2085S initiates a soft start at power up and after every overcurrent condition. Undervoltage lockout prevents
operation if VCC is less than 7.5Vdc.
Simplified Circuit Diagram
Vbias (10-15V)
D BOOT
C BOOT
Vin ( 100V max)
RT
CT
C BIAS
Vb
Vcc HO
OSC
Vs
Cs LO
GND
S1
S2
C2
C1
S R1
L
C R Vo
S R2
www.irf.com
1


International Rectifier Electronic Components Datasheet

IR2085S Datasheet

HIGH SPEED/ 100V/ SELF OSCILLATING 50% DUTY CYCLE/ HALF-BRIDGE DRIVER

No Preview Available !

IR2085S& (PbF)
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage param-
eters 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
Vb
VCC
VS
VHO
VLO
OSC
VCS
dVS/dt
ICC
PD
RthJA
TJ
TS
TL
Definition
High side floating supply voltage
Low side supply voltage
High side floating supply offset voltage
High side floating output voltage
Low side output voltage
OSC pin voltage
Cs 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)
Min.
-0.3
Vb - 25
Vb - 0.3
-0.3
-0.3
-0.3
-50
-55
-55
Max.
150
25
Vb + 0.3
Vb + 0.3
VCC + 0.3
VCC + 0.3
VCC + 0.3
+50
20
1.0
200
150
150
300
Units
V
V/ns
mA
W
°C/W
°C
Recommended Operating Conditions
For proper operation the device should be used within the recommended conditions.
Symbol
Definition
Min.
Max. Units
Vb
VS
VCC
High side floating supply voltage
Steady state high side floating supply offset voltage
Supply voltage
Vdd -0.7
15
-5 100 Vdc
10 15
ICC Supply current (Note 2)
RT Timing resistor
— 5 mA
10 100 K
CT Timing capacitor
47
1000
pF
fosc(max)
TJ
Operating frequency (per channel)
Junction temperature
— 500 KHz
-40 125 °C
Note1: Care should be taken to avoid output switching conditions where the Vs node flies inductively below ground by more
than 5V.
2 www.irf.com


Part Number IR2085S
Description HIGH SPEED/ 100V/ SELF OSCILLATING 50% DUTY CYCLE/ HALF-BRIDGE DRIVER
Maker International Rectifier
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IR2085S Datasheet PDF






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