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PDF IR2085SPbF Data sheet ( Hoja de datos )
| Número de pieza | IR2085SPbF | |
| Descripción | HIGH SPEED/ 100V/ SELF OSCILLATING 50% DUTY CYCLE/ HALF-BRIDGE DRIVER | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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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
1 page  
IR2085S&( PbF)
500
450
400
350
300
250
200
150
100
50
0
10
CT = 470pF
CT = 47pF
CT = 100pF
CT = 220pF
20 30 40 50 60 70 80 90 100
RT (kohms)
Fig. 1 Typical Output Frequency (-25oC to 125oC)
250
225
200
175 CT = 470pF
150
CT = 220pF
125 CT = 100pF
100 CT = 47pF
75
50
10
20 30 40 50 60 70 80 90 100
RT (kohms)
Fig. 2 Typical Dead Time (@25oC)
www.irf.com
180
160
140
120
100
DT(CT=100pF, RT=100k)
80
60
-40 -20 0 20 40 60 80 100 120
Temperature
Fig. 3 Typical Dead Time vs Temperature
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet IR2085SPbF.PDF ] | |
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