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UC1524J Scheda tecnica(PDF) 5 Page - Texas Instruments

Il numero della parte UC1524J
Spiegazioni elettronici  Advanced Regulating Pulse Width Modulators
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UC1524
UC2524
UC3524
Oscillator
The oscillator controls the frequency of the UC1524 and is
programmed by RT and CT according to the approximate
formula:
f
RC
TT
1.18
where
RT is in kΩ
where
CT is in mF
where
f is in kHz
Practical values of CT fall between 0.001mF and 0.1mF.
Practical values of RT fall between 1.8kΩ and 100kΩ.
This results in a frequency range typically from 120Hz to
500kHz.
Blanking
The output pulse of the oscillator is used as a blanking
pulse at the output. This pulse width is controlled by the
value of CT. If small values of CT are required for fre-
quency control, the oscillator output pulse width may still
be increased by applying a shunt capacitance of up to
100pF from pin 3 to ground. If still greater dead-time is re-
quired, it should be accomplished by limiting the maxi-
mum duty cycle by clamping the output of the error
amplifier. This can easily be done with the circuit in Fig-
ure 1:
Synchronous Operation
When an external clock is desired, a clock pulse of ap-
proximately 3V can be applied directly to the oscillator
output terminal. The impedance to ground at this point is
approximately 2k
Ω. In this configuration RT CT must be
selected for a clock period slightly greater than that of the
external clock.
If two or more UC1524 regulators are to operated synchro-
nously, all oscillator output terminals should be tied to-
gether, all CT terminals connected to single timing capacitor,
and the timing resistor connected to a single RT, terminal.
The other RT terminals can be left open or shorted to VREF.
Minimum lead lengths should be used between the CT ter-
minals.
APPLICATION INFORMATION
16
V
REF
COMP
5k
9
GND
8
1N916
Figure 1. Error amplifier clamp.
Figure 2. Single-ended LC switching regulator circuit.


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