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LM2578A датащи(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM2578A
подробное описание детали  Switching Regulator
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2578A датащи(HTML) 9 Page - National Semiconductor (TI)

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Applications Information (Continued)
C.L. SENSE VOLTAGE MULTIPLICATION
When a larger sense resistor value is desired, the voltage
divider network, consisting of R1 and R2, may be used. This
effectively multiplies the sense voltage by (1 + R1/R2). Also,
R1 can be replaced by a diode to increase current limit
sense voltage to about 800 mV (diode V
f + 110 mV).
UNDER-VOLTAGE LOCKOUT
Under-voltage lockout is accomplished with few external
components. When V
in
becomes lower than the zener
breakdown voltage, the output transistor is turned off. This
occurs because diode D1 will then become forward biased,
allowing resistor R3 to sink a greater current from the non-
inverting input than is sunk by the parallel combination of R1
and R2 at the inverting terminal. R3 should be one-fifth of the
value of R1 and R2 in parallel.
MAXIMUM DUTY CYCLE LIMITING
The maximum duty cycle can be externally limited by adjust-
ing the charge to discharge ratio of the oscillator capacitor
with a single external resistor. Typical values are 50 µA for
the charge current, 450 µA for the discharge current, and a
voltage swing from 200 mV to 750 mV. Therefore, R1 is
selected for the desired charging and discharging slopes
and C1 is readjusted to set the oscillator frequency.
00871117
FIGURE 4. Current Limit Transient Suppressor,
Ground Referred
00871118
FIGURE 5. Current Limit Transient Suppressor,
V
in Referred
00871119
FIGURE 6. Current Limit Sense Voltage Multiplication,
Ground Referred
00871120
FIGURE 7. Current Limit Sense Voltage Multiplication,
V
in Referred
00871122
FIGURE 8. Under-Voltage Lockout
www.national.com
9


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