IR2085STR Datasheet, PDF (1/8 Pages) International Rectifier – HIGH SPEED, 100V, SELF OSCILLATING 50% DUTY CYCLE, HALF-BRIDGE DRIVER

Data Sheet No. PD60206 Rev.D
IR2085S & (PbF)
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
• Also available Leadfree
Product Summary
Topology
Half-Bridge
V_OFFSET
≤ 100 V
I_o+ & I _o- (typical)
1.0A & 1.0A
f_OSC (max)
500kHz
Deadtime
50ns – 200ns
HO/LO Pulse
Matching
+/- 25ns
Package
8 - Lead SOIC
Description
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 f_OSC, which can be set by selecting R_T & C_T, where f_OSC = 1/(2*R_T.C_T).
Dead-time can be controlled through proper selection of C_T and can range from 50ns to 200ns. 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. The IR2085S initiates a soft start at power up and after every
overcurrent condition. Undervoltage lockout prevents operation if V_CC is less than 7.5V.
Typical Connection Diagram
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