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LM1771SMM Scheda tecnica(PDF) 10 Page - Texas Instruments

Il numero della parte LM1771SMM
Spiegazioni elettronici  Low-Voltage Synchronous Buck Controller
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VOUT
fSW =
D
VOUT
F =
VIN x TON
1
TP =
fSW
VOUT
D =
VIN
LM1771
SNVS446D – JUNE 2006 – REVISED JANUARY 2016
www.ti.com
7.3 Feature Description
7.3.1 Timing Opinion
Three versions of the LM1771 are available each with a predetermined TON set internally by EEPROM. This TON
setting determines the switching frequency for the application. Derivation and calculation of the dependence of
the switching frequency on VIN and TON is shown in Equation 1 through Equation 6.
In a PWM buck switcher, Equation 1, Equation 2, and Equation 3 can be manipulated to obtain the switching
frequency. Equation 1 shows the standard duty-cycle equation given by the volts-seconds balance on the
inductor with Equation 2 and Equation 3 defining standard relationships:
(1)
TON = D x TP
(2)
(3)
Using these equations and solving for duty-cycle for Equation 4:
D = fSW x TON
(4)
Frequency can now be expressed in Equation 5:
(5)
Or simply written as Equation 6:
where
α = VIN x TON
(6)
To maintain a set frequency in an application,
α is always held constant by varying TON inversely with VIN. The
three versions of the LM1771 are identified by the ON-times at a VIN of 3.3 V for consistency. For clarification,
see Table 1.
Table 1. Timing for All Variants
Product ID
TON at 3.3 V
α (V µs)
LM1771S
0.5 µs
1.65
LM1771T
1.0 µs
3.3
LM1771U
2.0 µs
6.6
The variation of TON versus VIN can also be expressed graphically. These graphs can be found in the Typical
Characteristics of the data sheet.
With
α being a constant regardless of the version of the LM1771 used, Equation 6 shows that the only
dependent variable remaining is VOUT. Because VOUT is a constant in any application, the frequency also remains
constant. The switching frequency at which the application runs depends upon the VOUT desired and the LM1771
version chosen. For any VOUT, three frequency options (LM1771 versions) can be selected. This can be seen
Table 2. The recommended frequency range of operation is 100 kHz to 1000 kHz.
10
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