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UC2525BN Folha de dados(PDF) 5 Page - Texas Instruments

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Nome de Peças UC2525BN
Descrição Electrónicos  Regulating Pulse Width Modulators
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Fabricante Electrônico  TI [Texas Instruments]
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UC2525BN Folha de dados(HTML) 5 Page - Texas Instruments

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UC1525B UC1527B
UC2525B UC2527B
UC3525B UC3527B
PRINCIPLES OF OPERATION AND TYPICAL
CHARACTERISTICS
Shutdown Options (See Block Diagram)
Since both the compensation and soft-start terminals
(Pins 9 and 8) have current source pull-ups, either can
readily accept a pull-down signal which only has to sink a
maximum of 100
µA to turn off the outputs. This is subject
to the added requirement of discharging whatever exter-
nal capacitance may be attached to these pins.
An alternate approach is the use of the shutdown cir-
cuitry of Pin 10 which has been improved to enhance the
available shutdown options. Activating this circuit by ap-
plying a positive signal on Pin 10 performs two functions:
the PWM latch is immediately set providing the fastest
turn-off signal to the external soft-start capacitor. If the
shutdown command is short, the PWM signal is termi-
nated without significant discharge of the soft-start ca-
pacitor, thus, allowing, for example, a convenient
implementation
of
pulse-by-pulse
current
limiting.
Holding Pin 10 high for a longer duration, however, will
ultimately discharge this external capacitor, recycling
slow turn-on upon release.
UDG-95060
UDG-95061
The low source impedance of the output drivers provides
rapid charging of power FET input capacitance while mini-
mizing external components.
Low power transformers can be driven directly by the
UC1525B. Automatic reset occurs during dead time, when
both ends of the primary winding are switched to ground.
UDG-95062
UC1525B Oscillator Schematic


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