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UC2524DW Datasheet(PDF) 6 Page - Texas Instruments

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Part No. UC2524DW
Description  ADVANCED REGULATING PULSE WIDTH MODULATORS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2524DW Datasheet(HTML) 6 Page - Texas Instruments

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APPLICATION INFORMATION
OSCILLATOR
SYNCHRONOUS OPERATIONS
f
1.18
R
T
C
T
(1)
BLANKING
REF
COMP
9
GND
8
1N916
16
5 k
V+
+28 V
V−
1
2
16
6
7
3
10
15
12
11
13
14
4
5
9
9
5 k
R2
5 k
5 k
0.1 mF
5 k
3 k
0.02 mF
500 mF
1.5 k
0.001 mF
50 k
0.1
UC1524
PIC600
+5V, 5A
UC1524
UC2524
UC3524
SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005
The oscillator controls the frequency of the UC1524
When an external clock is desired, a clock pulse of
and is programmed by RT and CT according to the
approximately 3 V can be applied directly to the
approximate formula:
oscillator output terminal. The impedance to ground
at
this
point
is
approximately
2
k
Ω. In this
configuration RT CT must be selected for a clock
period slightly greater than that of the external clock.
where
If two or more UC1524 regulators are to operated
RT is in kΩ
synchronously, all oscillator output terminals should
be tied together, all CT terminals connected to single
CT is in µF
timing capacitor, and the timing resistor connected to
f is in kHz
a single RT, terminal.
Practical values of CT fall between 1 nF and 100 nF.
Practical values of RT fall between 1.8 kΩ and 100
k
Ω. This results in a frequency range typically from
120 Hz to 500 kHz.
The output pulse of the oscillator is used as a
blanking pulse at the output. This pulse width is
Figure 5. Error Amplifier Clamp
controlled by the value of CT. If small values of CT are
required for frequency control, the oscillator output
pulse width may still be increased by applying a shunt
The other RT terminals can be left open or shorted to
capacitance of up to 100 pF from pin 3 to ground. If
VREF. Minimum lead lengths should be used between
still greater dead-time is required, it should be
the CT terminals.
accomplished by limiting the maximum duty cycle by
clamping the output of the error amplifier. This can
easily be done with the circuit in Figure 5.
Figure 6. Single-Ended LC Switching Regulator Circuit
6


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