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TS19701A Folha de dados(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

Nome de Peças TS19701A
Descrição Electrónicos  CC/CV Primary-Side PWM Controller Power on Soft-start
Download  9 Pages
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Fabricante Electrônico  TSC [Taiwan Semiconductor Company, Ltd]
Página de início  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS19701A Folha de dados(HTML) 6 Page - Taiwan Semiconductor Company, Ltd

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TS19701A
CC/CV Primary-Side PWM Controller
6/9
Version: A12
Function Description (Continue)
Operation switching frequency
The switching frequency of TS19701A is adaptively controlled according to the load conditions and the operation
modes. No external frequency setting components are required. The operation switching frequency at maximum
output power is set to 60KHz internally.
For flyback operating in DCM, The maximum output power is given by
Where Lp indicate the inductance of primary winding and Ip is the peak current of primary winding. Refer to the
equation 3, the change of the primary winding inductance results in the change of the maximum output power and
the constant output current in CC mode. To compensate the change from variations of primary winding inductance,
the switching frequency is locked by an internal loop such that the switching frequency is
Since TDemag is inversely proportional to the inductance, as a result, the product Lp and fsw is constant, thus the
maximum output power and constant current in CC mode will not change as primary winding inductance changes.
Up to ±10% variation of the primary winding inductance can be compensated. Frequency shuffling for EMI
improvement the frequency shuffling (switching frequency modulation) is implemented in TS19701A. The
oscillation frequency is modulated so that the tone energy is spread out. The spread spectrum minimizes the
conduction band EMI and therefore eases the system design.
Current Sensing and Leading Edge Blanking
Cycle-by-Cycle current limiting is offered in TS19701A current mode PWM control. The switch current is detected
by a sense resistor into the CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at
initial internal power MOSFET on state so that the external RC filtering on sense input is no longer needed. The
PWM duty cycle is determined by the current sense input voltage and the EA output voltage.
Gate Drive
The internal power MOSFET in TS19701A is driven by a dedicated gate driver for power switch control. Too weak
the gate drive strength results in higher conduction and switch loss of MOSFET while too strong gate drive
compromises EMI. A good tradeoff is achieved through the built-in totem pole gate design with right output strength
control.
Programmable Cable drop Compensation
In TS19701A, cable drop compensation is implemented to achieve good load regulation. An offset voltage is
generated at INV by an internal current flowing into the resister divider. The current is inversely proportional to the
voltage across pin COMP, as a result, it is inversely proportional to the output load current, thus the drop due to the
cable loss can be compensated. As the load current decreases from full-load to noload, the offset voltage at INV
will increase. It can also be programmed by adjusting the resistance of the divider to compensate the drop for
various cable lines used.


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