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UCC25230 Datasheet(PDF) 11 Page - Texas Instruments

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Part # UCC25230
Description  12-V to 100-V Input, 0.2-A Output Switching Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC25230 Datasheet(HTML) 11 Page - Texas Instruments

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UCC25230
www.ti.com
SLUSAQ6A
– NOVEMBER 2011
APPLICATION INFORMATION
Detailed Description
The UCC25230 PWM converter integrates all necessary functions to operate as an isolated auxiliary bias supply.
It is capable of operating from an input voltage range of 12 V to 100 V (up to 105-V surge), making it ideal for
usage in 24-V or 48-V input telecom applications. High-side and low-side power switches are integrated and
provide up to 200 mA of peak output current. The UCC25230 is an ideal, complementary solution to primary-side
or secondary-side PWM control methodologies as it provides bias voltages necessary for PWM controllers and/or
external peripheral circuitry. UCC25230 is capable of delivering a primary-side and/or secondary-side bias
voltage for power supplies. As such, UCC25230 is optimized for Texas Instruments
’ family of UCD3k digital and
analog PWM controllers as well as the C2000 family of microcontrollers.
UCC25230 operates using Texas Instruments
’ Flybuck™ Topology, which simplifies design versus a traditional
flyback topology. FlybuckTM Topology allows a synchronous buck
–like design methodology. It also enables a
significant reduction in external parts count, and also allows usage of a small 2-winding transformer. The
Flybuck
™ Topology does not require a third transformer winding or opto-isolator for regulation. Circuits
employing extra transformer windings compromise dynamic response, and add to the transformer
’s physical size
and cost. The Flybuck
™ is a portmanteau of flyback and buck since the transformer is connected as a flyback
converter and the input to output voltage relationship is similar to a buck derived converter.
Typically, an auxiliary bias supply must be designed such that it is the first device in the system to power up, and
be the very last device, in the system, to power down. It must be a robust supply, being able to ride through any
fault conditions (OV, UV, OTP, etc) and it also must not prematurely shut down the entire power supply. The
UCC25230 was designed with these goals in mind:
A 2-ms soft start ensures a smooth, monotonic startup on both primary and secondary-side voltages.
Voltage mode with input voltage feedforward allows optimal output filter design.
Cycle-by-cycle current limit with frequency foldback permits startup under high-capacitive loading.
Programmable UV/OV detection circuit.
A VIN_G fault output provides a fast propagation open drain signal to indicate when an overvoltage or
undervoltage condition has been detected. The UCC25230 is specifically designed to remain operational
when a fault is detected in order to allow for fast external shutdown.
Copyright
© 2011, Texas Instruments Incorporated
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