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IR1175-IR1175S-IR1176-IR1176S-IR1176SS
Synchronous Rectifier Driver, 2MHz Max Frequency, 500ns leadtime, Schmitt Trigger Input in a 20 Lead DIP package
Preliminary Data Sheet PD60185-C
International
IEER Rectifier IR1176
SYNCHRONOUS RECTIFIER DRIVER
Features
q Provides constant and proper gate drive to power
MOSFETs regardless of transformer output
q Minimizes loss due to power MOSFET body
drain diode conduction
q Stand alone operation - no ties to primary side
q Schmitt trigger input with double pulse suppress-
ion allows operation in noisy environments
q High peak current drive capability - 4A
q High speed operation - 2MHz
q Adaptable to multiple topologies
Description
The IR1176 is a high speed CMOS controller designed
to drive N-channel power MOSFETs used as synchro-
nous rectihers in high current, high frequency forward
converters with output voltages equal or below 5VDC.
Schmitt trigger inputs with double pulse suppression
allow the controller to operate in noisy environments.
The circuit does not require any ties to the primary
side and derives its operating power directly from
the secondary. The circuit functions by anticipating
transformer output transitions, then turns the power
MOSFETs on or off before the transitions of the trans-
former to minimize body drain diode conduction and
reduce associated losses. Turn on/off lead time can
be adjusted to accommodate a variety of power
MOSFET sizes and circuit conditions. The IR1176 also
provides gate drive ovedap/dead-time control via
external components to further minimize diode con-
duction by nulling effects of secondary loop and de-
vice package inductance.
Product Summary
500nsec
lO+/- (peak)
Maxleadtime
Packages
IR1176S
20 Lead Surface Mount
(SSOP-20)
IR1176SS
20 Lead SOIC (MS-013AC)
IR1176
20 Lead PDIP
(MS-001AD)
International
IR1176
mn Rectifier
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur.
Symbol Definition Min. Max. Units
Vdd Supply voltage - 7 VDC
lin Input clamp current - +/- 10 onc
PD Power dissipation (SSOP-20) - 400 mW
(SOIC) - - -
(PDIP) - - -
RthJc Thermal resistance (SSOP-20) junction-to-case - 28.5
(SOIC) junction-to-case - 20
(PDIP) junction-to-case - 28.1 ''C/1/V
RthJA Thermal resistance (SSOP-20) junction-to-ambient - 90.5
(SOIC) junction-to-ambient - 45
(PDIP) junction-to-ambient - 62.4
TJ Junction temperature - 150
Ts Storage temperature -55 150 "C
TL Lead temperature (soldering, 10 seconds) - 300
Recommended Operating Conditions
Symbol Definition Min. Typ. Max. Units
Vdd Supply voltage operating range - 5 - Voc
TA Ambient temperature -40 - 85 ''C
Freq Operating frequency 250 - 500 KHz
Rbias Required bias resistor (+/- 1%) - 34.0 - Kn
UV Voltage at UVSET pin 1.75 - 2.25 Voc
Xin Maximum voltage at X1 and X2 inputs - - 5.6 Voc
Cd1/Cd2 Capacitance at pins DTIN1 and DTIN2 - - 100 pF
2
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