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LM2694MTX 数据表(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM2694MTX
功能描述  30V, 600 mA Step Down Switching Regulator
Download  19 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM2694MTX 数据表(HTML) 11 Page - National Semiconductor (TI)

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Start-Up Regulator, V
CC
(Continued)
Regulation Comparator
The feedback voltage at FB is compared to the voltage at the
Softstart pin (2.5V). In normal operation (the output voltage
is regulated), an on-time period is initiated when the voltage
at FB falls below 2.5V. The buck switch stays on for the
programmed on-time, causing the FB voltage to rise above
2.5V. After the on-time period, the buck switch stays off until
the FB voltage falls below 2.5V. Input bias current at the FB
pin is less than 100 nA over temperature.
Over-Voltage Comparator
The voltage at FB is compared to an internal 2.9V reference.
If the voltage at FB rises above 2.9V the on-time pulse is
immediately terminated. This condition can occur if the input
voltage or the output load changes suddenly, or if the induc-
tor (L1) saturates. The buck switch remains off until the
voltage at FB falls below 2.5V.
ON-Time Timer, and Shutdown
The on-time for the LM2694 is determined by the R
ON resis-
tor and the input voltage (V
IN), and is calculated from:
(4)
See Figure 4. The inverse relationship with V
IN results in a
nearly constant frequency as V
IN is varied. To set a specific
continuous conduction mode switching frequency (F
S), the
R
ON resistor is determined from the following:
(5)
In high frequency applications the minimum value for t
ON is
limited by the maximum duty cycle required for regulation
and the minimum off-time of 265 ns, ±15%. The minimum
off-time limits the maximum duty cycle achievable with a low
voltage at V
IN. The minimum allowed on-time to regulate the
desired V
OUT at the minimum VIN is determined from the
following:
(6)
The LM2694 can be remotely shut down by taking the
RON/SD pin below 0.8V. See Figure 10. In this mode the SS
pin is internally grounded, the on-timer is disabled, and bias
currents are reduced. Releasing the RON/SD pin allows
normal operation to resume. The voltage at the RON/SD pin
is normally between 1.5V and 3.0V, depending on V
IN and
the R
ON resistor.
20187014
FIGURE 9. Self Biased Configuration
20187019
FIGURE 10. Shutdown Implementation
www.national.com
11


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