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UC2879 Fiches technique(PDF) 1 Page - Texas Instruments

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No de pièce UC2879
Description  Phase Shift Resonant Controller
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2879 Fiches technique(HTML) 1 Page - Texas Instruments

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FEATURES
• Programmable Output Turn On
Delay; Zero Delay Available
• Compatible with Voltage Mode or
Current Mode Topologies
• Practical Operation at Switching
Frequencies to 300kHz
• Four 100mA Totem Pole Outputs
• 10MHz Error Amplifier
• Pin Programmable Undervoltage
Lockout
• Low Startup Current - 150µA
• Soft Start Control
• Outputs Active Low During UVLO
Phase Shift Resonant Controller
BLOCK DIAGRAM
UDG-94070-1
UC1879
UC2879
UC3879
DESCRIPTION
The UC3879 controls a bridge power stage by phase shifting the switching
of one half-bridge with respect to the other. This allows constant frequency
pulse width modulation in combination with resonant, zero-voltage switching
for high efficiency performance. The UC3879 can be configured to provide
control in either voltage mode or current mode operation, with overcurrent
shutdown for fast fault protection.
Independently programmable time delays provide dead-time at the turn-on
of each output stage, allowing time for each resonant switching interval.
With the oscillator capable of operating in excess of 600kHz, overall output
switching frequencies to 300kHz are practical. In addition to the standard
free running mode, with the CLKSYNC pin, the user may configure the
UC3879 to accept an external clock synchronization signal. Alternatively, up
to three units can be locked together with the operational frequency deter-
mined by the fastest device.
Protective features include an undervoltage lockout and overcurrent protec-
tion. Additional features include a 10MHz error amplifier, a 5V precision ref-
erence, and soft start. The UC3879 is available in 20 pin N, J, DW, and Q
and 28 pin L packages.


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