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LM2524DN Fiches technique(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM2524DN
Description  Regulating Pulse Width Modulator
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2524DN Fiches technique(HTML) 9 Page - National Semiconductor (TI)

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Functional Description (Continued)
The output of the amplifier, or input to the pulse width modu-
lator, can be overridden easily as its output impedance is
very high (Z
O . 5M
Ω). For this reason a DC voltage can be
applied to pin 9 which will override the error amplifier and
force a particular duty cycle to the outputs. An example of
this could be a non-regulating motor speed control where a
variable voltage was applied to pin 9 to control motor speed.
A graph of the output duty cycle vs the voltage on pin 9 is
shown in Figure 5.
The duty cycle is calculated as the percentage ratio of each
output’s ON-time to the oscillator period. Paralleling the out-
puts doubles the observed duty cycle.
The amplifier’s inputs have a common-mode input range of
1.5V–5.5V. The on board regulator is useful for biasing the
inputs to within this range.
CURRENT LIMITING
The function of the current limit amplifier is to override the
error amplifier’s output and take control of the pulse width.
The output duty cycle drops to about 25% when a current
limit sense voltage of 200 mV is applied between the +C
L
and −C
Lsense terminals. Increasing the sense voltage ap-
proximately 5% results in a 0% output duty cycle. Care
should be taken to ensure the −0.7V to +1.0V input common-
mode range is not exceeded.
In most applications, the current limit sense voltage is pro-
duced by a current through a sense resistor. The accuracy of
this measurement is limited by the accuracy of the sense
resistor, and by a small offset current, typically 100 µA,
flowing from +CL to −CL.
OUTPUT STAGES
The outputs of the LM3524D are NPN transistors, capable of
a maximum current of 200 mA. These transistors are driven
180˚ out of phase and have non-committed open collectors
and emitters as shown in Figure 6.
00865008
FIGURE 5.
00865009
FIGURE 6.
www.national.com
9


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